Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

A 410 MeV/u U-238 projectile beam was used to create cadmium isotopes via abrasion-fission in a beryllium target placed at the entrance of the in-flight separator FRS at GSI. The fission fragments were separated by the FRS and injected into the isochronous storage ring ESR for mass measurements. Isochronous Mass Spectrometry (IMS) was performed under two different experimental conditions, with and without B rho-tagging at the high-resolution central focal plane of the FRS. In the experiment with B rho-tagging the magnetic rigidity of the injected fragments was determined with an accuracy of 2 . 10(-4). A new method of data analysis, which uses a correlation matrix for the combined data set from both experiments, has provided experimental mass values of 25 rare isotopes for the first time. The high sensitivity and selectivity of the method have given access to nuclides detected with a rate of a few atoms per week. In this letter we present for the Cd-129,Cd-130,Cd-131 isotopes mass values directly measured for the first time. The experimental mass values of cadmium as well as for tellurium and tin isotopes show a pronounced shell effect towards and at N=82. Shell quenching cannot be deduced from a single new mass value, nor by a better agreement with a theoretical model which explicitly takes into account a quenching feature. This is in agreement with the conclusion from gamma-ray spectroscopy and confirms modern shell-model calculations. (C) 2016 Published by Elsevier B.V. This is an open access article under the CC BY license.

DOI： 10.1016/j.physletb.2016.01.039

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：IOP PUBLISHING LTD  

Highly charged radioactive ions can be stored for extended periods of time in storage rings which allows for precision measurements of their decay modes. The straightforward motivation for performing such studies is that fully ionised nuclei or few-electron ions can be viewed as clean quantum-mechanical systems, in which the interactions of the many electrons can be either excluded or treated precisely. Thus, the influence of the electron shell on the decay probability can be investigated. Another important motivation is stellar nucleosynthesis, which proceeds at high temperatures and the involved atoms are therefore highly ionised. Presented here is a compact review of the relevant experiments conducted at heavy-ion storage rings. Furthermore, we outline the perspectives for future experiments at new-generation storage-ring facilities.

DOI： 10.1088/0953-4075/48/14/144024

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPRINGER  

A beta-NMR study of B-12 implanted in diamond was performed in order to investigate the implantation sites and the defects. The maintained polarization of B-12 was measured by use of widely modulated rf around the Larmor frequency (nu = nu (L) +/- 200 kHz) as a function of temperature from 160 K to 320 K. The observed polarization was found to be almost constant at about 0.9 % in this temperature range. The initial polarization for this system was obtained as about 8.1 %. Therefore about 10 % of the implanted B-12 maintained its polarization in this frequency range. Conversely, about 90 % of the implanted B-12 was undetected in the present experiment.

DOI： 10.1007/s10751-014-1090-z

Web of Science

researchmap

Publishing type：Research paper (scientific journal)  

© 2015 The Physical Society of Japan. We successfully measured muonic X-rays of cosmic-ray muons stopped in Al and Fe targets. In order to identify the events that incoming cosmic-ray muons were stopped in the targets, a coincidence and anticoincidence system of three plastic scintillators was used. The X-rays associated with the atomic muon captures were measured with germanium detectors. Measurements using the Al and Fe targets were carried out for 33 and 16 days, respectively. A sufficient number of muonic X-ray events for identifying the elemental compositions of the target materials were clearly observed. This technique provides a means of nondestructive elemental analysis that does not require the use of particle accelerators.

DOI： 10.7566/JPSJ.84.034301

Web of Science

Scopus

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

Reaction cross sections of Li-8 on stable targets were measured at intermediate energies. With the existing experimental data of interaction cross sections at 790 MeV/nucleon the nucleon density distribution of Li-8 was extracted by the use of the modified Glauber model. Meanwhile, the existing data of B-8 have been also reanalyzed. Structures of Li-8 and B-8 were compared through the density. On the basis of dilute surface densities, the discussion of Li-7(n,gamma) Li-8 and Be-7(p,gamma) B-8 capture reactions was performed within the framework of the direct capture reaction mechanism. The calculations agreed quite well with the experimental data as well as other analyses.

DOI： 10.1103/PhysRevC.91.014614

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

Precise reaction cross sections (sigma R) for (24- 38) Mg on C targets at energies around 240 MeV/nucleon have been measured at the Radioactive Isotope Beam Factory at RIKEN. The sigma R for (36-38) Mg have been measured for the first time. An enhancement of sR compared to the systematics for spherical stable nuclei has been observed, especially in the neutron-rich region, which reflects the deformation of those isotopes. In the vicinity of the drip line the sR for Mg-37 is especially large. It is shown by analysis using a recently developed theoretical method that this prominent enhancement of sR for Mg-37 should come from the p-orbital halo formation breaking the N = 28 shell gap.

DOI： 10.1103/PhysRevC.90.061305

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

We have precisely measured reaction cross sections (sigma(R)) for Li-8 using Be-9, C-12, Al-27, and proton targets at intermediate energies by the transmission method. From the energy dependence of the sigma(R) including the high energy data, the density distribution of Li-8 was deduced through a modified Glauber model. It is shown that Li-8 has a shorter tail structure in the density as compared with that of B-8 and the matter radius of Li-8 is similar to those of the other nonhalo Li isotopes. The result is consistent with the previous experiments that there is a tendency for Li-8 to be a skin nucleus.

DOI： 10.1103/PhysRevC.90.044321

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

We measured the reaction cross sections of the two-neutron halo nucleus Be-14 with proton and carbon targets at about 41 and 76 MeV/nucleon. Based on a Glauber model calculation, we deduced the matter density distribution of Be-14 in which previously measured interaction cross sections at relativistic energies were also included. An s-wave dominance in Be-14 has been confirmed, although the halo tail of Be-14 is not distributed as much as that of Li-11. Significant mixing of the p-wave in addition to the s- and d-wave is also suggested. (C) 2014 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nuclphysa.2014.06.003

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

This paper reports NMR measurements of the magnetic dipole moments of two high-K isomers, the 37/2(-), 51.4 m, 2740 keV state in Hf-177 and the 8(-), 5.5 h, 1142 keV state in Hf-180 by the method of on-line nuclear orientation. Also included are results on the angular distributions of. transitions in the decay of the 177Hf isotope. These yield high precision E2/M1 multipole mixing ratios for transitions in bands built on the 23/2(+), 1.1 s, isomer at 1315 keV and on the 9/2(+), 0.663 ns, isomer at 321 keV. The new results are discussed in the light of the recently reported finding of systematic dependence of the behavior of the g(R) parameter upon the quasiproton and quasineutron make up of high-K isomeric states in this region.

DOI： 10.1103/PhysRevC.89.044309

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

The total charge-changing, charge pick-up, and partial charge-changing cross sections of very neutron-rich nuclei (Ne-30, Na-32,Na-33) with a proton target have been measured at similar to 240A MeV for the first time. We introduced the phenomenological correction factor in Glauber-model calculations for the total charge-changing cross sections with the proton target, and applied it to deduce the proton radii of these nuclei. For 30Ne and Na-32, the neutron skin thicknesses of the nuclei were deduced by comparing the proton radii with the matter radii deduced from the interaction cross-section measurements. A significant thick neutron-skin has been observed for the nuclei. We also found that the charge pick-up cross sections are much larger than those in the systematics of stable nuclei.

DOI： 10.1103/PhysRevC.89.044602

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：E D P SCIENCES  

Interaction cross sections (sigma(I)) for Na22-35 isotopes from the stability line to the vicinity of the neutron drip line have been measured at around 240 MeV/nucleon. The sigma(I) for Na33-35 were measured for the first time. Enhancement in cross sections is clearly observed from the systematics for stable nuclei, for isotopes with large mass numbers. From the known values of the nuclear-deformation parameters beta(2) of Na22-31, these enhancement can be mainly ascribed to the nuclear deformation. Large enhancement in heavier isotopes suggest that these nuclei are strongly deformed. The root-mean-square (RMS) nuclear matter radii were deduced from the sigma(I) by using Glauber-type calculation. Furthermore, a monotonic growth of the neutron-skin thickness has been deduced with increasing neutron number for Na isotopes.

DOI： 10.1051/epjconf/20146603084

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：E D P SCIENCES  

Reaction cross sections (sigma R) for Mg24-38 on C targets at the energies of around 240 MeV/nucleon have been measured precisely at RIBF, RIKEN for the purpose of obtaining the crucial information on the changes of nuclear structure in unstable nuclei, especially around the so-called "island of inversion" region. In the island of inversion region, which includes neutron-rich Ne, Na, and Mg isotopes, the vanishing of the N = 20 magic number for neutrons have been discussed along with nuclear deformation. The present result suggest deformation features of Mg isotopes and shows a large cross section of weakly-bound nucleus Mg-37, which could be caused by a neutron halo formation.

DOI： 10.1051/epjconf/20146602101

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：E D P SCIENCES  

The question of whether charge-changing interactions can be used to probe point-proton radii of nuclei remains unanswered. Charge-changing cross sections, sigma(cc), were systematically investigated using stable and unstable nuclear beams of intermediate-energy. The ratios of the experimental sigma(cc) values to the calculated ones obtained from a phenomenological Glauber-type model analysis are found to be nearly constant in a broad range of Z/N for light neutron-rich nuclei. This enables the determination of density distributions, i.e., the radii of protons tightly bound in nuclei. To test the applicability of the present method to all nuclei in the nuclear chart, extensive measurements were performed for medium-mass nuclei ranging from Z = 18 to 32. The present study suggests the potential capability of a new experimental approach for exploring exotic nuclei.

DOI： 10.1051/epjconf/20146603099

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：E D P SCIENCES  

An isomeric state in the proton drip-line nucleus P-26 has been observed by the gamma-ray spectroscopy. The gamma-ray energy and the half-life are 164.4 +/- 0.1 keV and 120 +/- 9 ns, respectively. For the isomeric transition of the mirror nucleus Na-26, the gamma-ray energy of 82.40 +/- 0.04 keV and the half-life of 4.35 +/- 0.16 mu s are also revised. Comparing the experimental reduced transition probabilities of Na-26 and P-26 with theoretical ones calculated by the shell model with the USDA interaction, the spin-parity (J(pi)) of the isomeric state in P-26 is most likely to be 1(+).

DOI： 10.1051/epjconf/20146602072

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：E D P SCIENCES  

Reaction cross sections (sigma(R)) for the neutron-rich nucleus B-14 on Be, C, and Al targets have been measured at several energies in the intermediate energy range of 45-120 MeV/nucleon. The present experimental sigma(R) show a significant enhancement relative to the systematics of stable nuclei. The nucleon density distribution was deduced through the fitting procedure with the modified Glauber calculation. The necessity of a long tail in the density distribution was found, which is consistent with the valence neutron in 2s(1/2) orbital with the small empirical one-neutron separation energy in B-14.

DOI： 10.1051/epjconf/20146602037

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Charge-changing interactions of stable and unstable medium-mass nuclides have been systematically investigated at intermediate energies. Secondary beams ranging from Ar to Ge isotopes produced by projectile fragmentation of Fe-56 and Ge-76 were irradiated onto a carbon target, and their total and partial charge-changing cross sections were precisely measured. A clear odd even effect found in the partial charge-changing cross sections monotonically varies as a function of the Z/N ratio among the isotopes, and grows toward the neutron-deficient side. The total charge-changing cross sections are sensitive to the Z number of nuclides, and tend to gradually increase toward the neutron-deficient side in some isotopes. (C) 2013 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nimb.2013.05.057

Web of Science

researchmap

Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.nimb.2013.07.056

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：IOP PUBLISHING LTD  

In recent years several measurements of the orbital electron capture half-lives of few-electron ions have been carried out employing the storage ring ESR at GSI. Hydrogen-like and helium-like Pr-140 and Pm-142 as well as hydrogen-like I-122 were studied. Half-lives of the corresponding fully ionized nuclides provide the three-body beta(+) decay constants.

DOI： 10.1088/0031-8949/2013/T156/014026

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：IOP PUBLISHING LTD  

A brief overview is presented in this paper on some experiments conducted at the Experimental Storage Ring (ESR) of GSI which addressed the beta decay of stored and cooled highly charged ions. Special emphasis is placed on the two-body beta decay of bare or few-electron ions: bound-state beta(-) decay (beta(b)) and its time-mirrored counterpart, orbital electron capture. The former decay mode was detected experimentally 20 years ago at the ESR. The latter could be investigated there for the first time in detail for the simplest quantum systems: hydrogen-and helium-like atoms. The main results of these experiments will be presented. Also their impact on stellar nucleosynthesis, in particular the s-process, is discussed.

DOI： 10.1088/0031-8949/2013/T156/014025

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

We measured the reaction cross sections of the two-neutron halo nucleus Li-11 with solid hydrogen and carbon targets at around 31 and 41 MeV/nucleon. The neutron density distribution of Li-11 was deduced for the first time by the Glauber model calculation based on the optical limit approximation. The uncertainty of the matter density of Li-11 was improved, compared with earlier measurements. The present root-mean-square radius of the proton distribution agrees with the previous one derived from an optical isotope shift measurement. The present root-mean-square radii reproduce theoretical calculations by the tensor optimized shell model by assuming core excitation. This consistency suggests the possibility that Li-9 in Li-11 is excited and the disappearance of the N = 8 shell gap of Li-11 is caused by correlations originating from the nucleon force, such as the tensor and the pairing.

DOI： 10.1103/PhysRevC.88.024610

Web of Science

researchmap

Language：English   Publisher：AMER PHYSICAL SOC  

DOI： 10.1103/PhysRevLett.110.229901

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPRINGER  

In order to investigate the polarization process in charge exchange reactions, we observed the momentum and angular distribution as well as the nuclear polarization of a proton-rich beta-emitting nucleus, P-28 (I (pi) = 3 (+) , T (1/2) = 270 msec), produced through the reaction Si-28+ Be-9 at E = 100 MeV/u, by selecting the momentum and the ejection angle. An analysis by using double Gaussian functions resolved the observed momentum distribution into two reaction components, nucleon knockout and pick-up abrasion reactions, as suggested in a previous study. The behavior of the observed angular distribution and nuclear polarization implies the influence of those two components. The momentum dependence of the observed nuclear polarization of P-28 could be consistently reproduced by a simple model, in which two reaction components are considered. The present study also shows that the charge exchange reaction at intermediate energy is a useful method to produce polarized beta-emitting nuclei, especially for proton-rich nuclei.

DOI： 10.1007/s10751-012-0741-1

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPRINGER  

Production of spin polarized short-lived nucleus N-12 (I (pi) = 1 (+) , T (1/2) = 11 ms) using heavy ion reactions at intermediate energies has been performed. Typical polarization of about -25 % and +10 % through the projectile fragmentation Be(N-14, N-12)X and the charge exchange CH2(C-12, N-12)X processes, respectively, was obtained. The present study proved that the combination of a C-12 beam and a proton target provides a fairly good quality of polarized N-12 beam in terms of intensity and energy uniformity, and is promising for materials science use of N-12 as a nuclear probe.

DOI： 10.1007/s10751-013-0869-7

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

Long-lived isomers in Bi212 have been studied following U238 projectile fragmentation at 670 MeV per nucleon. The fragmentation products were injected as highly charged ions into a storage ring, giving access to masses and half-lives. While the excitation energy of the first isomer of Bi212 was confirmed, the second isomer was observed at 1478(30) keV, in contrast to the previously accepted value of &gt
1910 keV. It was also found to have an extended Lorentz-corrected in-ring half-life &gt
30 min, compared to 7.0(3) min for the neutral atom. Both the energy and half-life differences can be understood as being due a substantial, though previously unrecognized, internal decay branch for neutral atoms. Earlier shell-model calculations are now found to give good agreement with the isomer excitation energy. Furthermore, these and new calculations predict the existence of states at slightly higher energy that could facilitate isomer deexcitation studies. © 2013 American Physical Society.

DOI： 10.1103/PhysRevLett.110.122502

Web of Science

Scopus

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD  

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

A search for isomeric gamma decays among fission fragments from 345 MeV/nucleon U-238 has been performed at the RIKEN Nishina Center RI Beam Factory. Fission fragments were selected and identified using the superconducting in-flight separator BigRIPS and were implanted in an aluminum stopper. Delayed gamma rays were detected using three clover-type high-purity germanium detectors located at the focal plane within a time window of 20 mu s following the implantation. We identified a total of 54 microsecond isomers with half-lives of similar to 0.1-10 mu s, including the discovery of 18 new isomers in very neutron-rich nuclei: Ti-59(m), As-90(m), Se-92(m), Se-93(m), Br-94(m), Br-95(m), Br-96(m), Rb-97(m), Nb-108(m), Mo-109(m), Ru-117(m), Ru-119(m), Rh-120(m), Rh-122(m), Pd-121(m), Pd-124(m), Ag-124(m), and Ag-126(m), and obtained a wealth of spectroscopic information such as half-lives, gamma-ray energies, gamma-ray relative intensities, and gamma gamma coincidences over a wide range of neutron-rich exotic nuclei. Proposed level schemes are presented for Ti-59(m), Ga-82(m), Br-92(m), Br-94(m), Br-95(m), Rb-97(m), Rb-98(m), Nb-108(m), Zr-108(m), Mo-109(m), Ru-117(m), Ru-119(m), Rh-120(m), Rh-122(m), Pd-121(m), Ag-124(m), and Ag-125(m), based on the obtained spectroscopic information and the systematics in neighboring nuclei. The nature of the nuclear isomerism is discussed in relation to the evolution of nuclear structure.

DOI： 10.1103/PhysRevC.86.054319

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

The nucleus Sc-49, having a single f(7/2) proton outside doubly magic Ca-48 (Z = 20, N = 28), is one of the very few isotopes which makes possible testing of the fundamental theory of nuclear magnetism. The magnetic moment has been measured by online beta NMR of nuclei oriented at milli-Kelvin temperatures to be (+): 616(25) mu(N). The result is discussed in terms of a detailed theory of the structure of the magnetic moment operator, showing excellent agreement with calculated departure from the f(7/2) Schmidt limit extreme single-particle value. The measurement completes the sequence of moments of Sc isotopes with even numbers of f(7/2) neutrons: the first such isotopic chain between two major shells for which a full set of moment measurements exists. The result further completes the isotonic sequence of ground-state moments of nuclei with an odd number of f(7/2) protons coupled to a closed subshell of f(7/2) neutrons. Comparison with a recent shell-model calculation of the latter sequence is made.

DOI： 10.1103/PhysRevLett.109.032504

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Masses of U-238 projectile fragments have been measured with time-resolved Schottky Mass Spectrometry (SMS) at the FRS-ESR facility at GSI. The exotic nuclei were created in the production target at the entrance of the fragment separator FRS, spatially separated in flight and injected into the storage-cooler ring ESR at about 70% light velocity. This means the ions were mainly bare or carried only a few electrons, e.g., the population of Li-like ions was below 1% for Pt fragments. Accurate new mass values of 33 neutron-rich, stored exotic nuclei in the element range from platinum to uranium have been obtained for the first time. In total more than 150 nuclides including references with well-known masses have been covered in this large-area SMS measurement. A novel data analysis has been applied which reduces the systematic errors by taking into account the velocity profile of the cooler electrons and the residual ion-optical dispersion in this part of the storage ring. The experiment, the data analysis, and the mass values are presented. The experimental data are compared with theoretical predictions demonstrating systematic deviations of up to 1500 keV from modern mass models. (C) 2012 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nuclphysa.2012.03.002

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

The half-lives of fully ionized and hydrogen-like (H-like) I-122 ions have been measured in a heavy-ion storage ring. The beta(+)-decay constants for both charge states and the electron capture (EC) decay constant of H-like ions have been determined. The EC-decay constant in H-like I-122 ions lambda(H-like)(EC) = 7.35(33) . 10(-4) s(-1) is, within the uncertainty, the same as the one in neutral atoms. This result is in agreement with the estimates of recent theoretical considerations on the EC-decay of few-electron ions that explicitly take into account the conservation of the total angular momentum of the nucleus plus lepton(s) system and its projections. No firm confirmation could be concluded from our results on the predicted effect that allowed Gamow-Teller transitions become forbidden if the initial and final total angular momenta are not equal.

DOI： 10.1140/epja/i2012-12022-9

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Interaction cross sections (sigma(1)) for Me isotopes from the stability line to the vicinity of the neutron drip line have been measured at around 240 MeV/nucleon using BigRIPS at RIBF, RIKEN, The sigma(1) for Ne27-32 in every case exceed the systematic mass-number dependence of sigma(1) for stable nuclei, which can be explained by considering the nuclear deformation. In particular the sigma(1) for Ne-29 and Ne-31 are significantly greater than those of their neighboring nuclides. These enhancements of sigma(1) for Ne-29 and Ne-31 cannot be explained by a single-particle model calculation under the assumption that the valence neutron of Ne-29 (Ne-31) occupies the 0d(3/2) (0f(7/2)) orbital, as expected from the standard spherical shell ordering. The present data suggest an s dominant halo structure of Ne-29 and s- or p-orbital halo in Ne-31. (C) 2011 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physletb.2011.12.028

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

One-and two-neutron removal reactions from C-19 and C-20 have been studied using a liquid-hydrogen target at 40A MeV. A small cross section has been observed in the one-neutron removal reaction from C-20. The observed inclusive removal cross sections are compared with theoretical removal cross sections calculated by using shell model spectroscopic factors and Glauber-model single-particle cross sections. The observed momentum distributions are also compared with those calculated by using continuum-discretized coupled-channel methods. Good consistency between theory and experiment is shown in the one-neutron removal reaction from C-19. However, our theoretical calculation fails to reproduce the neutron removal reactions from C-20, which suggests that further improvements of the theoretical descriptions are necessary.

DOI： 10.1103/PhysRevC.84.064315

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Reaction cross sections with various kinds of breakup channels for neutron-rich carbon isotopes C18-20 and for Be-9 impinging on a liquid hydrogen target were investigated at 40 MeV/nucleon. The nuclides of interest were produced via projectile fragmentation from a 63 MeV/nucleon Ar-40 beam and were separated in flight at the RIKEN projectile fragment separator (RIPS). The combination of the large-acceptance superconducting TOF spectrometer, TOMBEE (TOF Mass analyzer for exotic BEam Experiment), with a liquid hydrogen target, CRYPTA (CRYogenic ProTon and Alpha target system), enables simultaneous measurements of several reaction channels: the reaction cross sections (sigma(R)), individual elemental fragmentation cross sections (sigma(Delta Z)), charge-changing cross sections (sigma(cc)), neutron-removal cross sections (sigma(-xn)), and charge-pickup cross sections (sigma(Delta Z+i)) for C-19,C-20.sigma(Delta Z), sigma(-xn), and sigma(Delta Z)+1 for C-18; and sigma(R) for Be-9. The present sigma(R) of Be-9 on proton, sigma(R) = 397 +/- 23 mb, measured in the inverse kinematics, was consistent with the previous measurements using proton beams at different laboratories. The sigma(R) of C-19 and C-20 on proton were determined to be sigma(R) = 754 +/- 22 mb and sigma(R) = 791 +/- 34 mb, respectively. Taking into account the beam energy and target dependence of sigma(R), the present sigma(R) are found to be considerably enhanced compared with those measured at around I GeV/nucleon. The sigma Delta Z+1 appears to increase with the mass number of the projectiles, and it significantly contributes to sigma(R) in the present energy range. The finite-range optical-limit and few-body Glauber model analyses were performed for sigma(R) to study the nuclear matter density distributions and to derive the relative strength of the s-wave components of the valence neutrons in C-19 and C-20. A neutron halo structure of C-19 is confirmed with an s-wave dominance of the valence neutron when the effect of the charge-pickup reaction is taken into account. The large sigma(-n) of C-19 and sigma(-2n) of C-20 also support the decoupled structures of C-18 + n and C-18 + 2n, respectively. The sigma(cc) of C-19 and C-20 agree with each other within their experimental uncertainties, which might indicate a similar proton density distribution in C-19 and C-20. The sigma(Delta Z) decreases monotonically without the even odd effect as the number of removed protons increases. (C) 2011 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nuclphysa.2011.05.095

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：POLISH ACAD SCIENCES INST PHYSICS  

The interaction cross-sections (sigma(I)) of neutron-rich Na isotopes, (23-35)Na, on C target have been measured at 250A MeV using the RI beam factory (RIBF) at RIKEN. Mass dependence of sigma(I) for (27-35)Na suggests monotonic growth of the skin thickness. The root-mean-square nuclear matter radii ((r) over tilde (m)) of (23-35)Na were deduced from observed sigma(I) via a Glauber-type calculation. These (r) over tilde (m) are in a good agreement with the theoretical prediction by relativistic mean field model (RMF). (r) over tilde (m) of (33-35)Na were determined for the first time.

DOI： 10.5506/APhysPolB.42.765

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

Reaction cross sections (sigma(R)) for the proton drip-line nucleus Ne-17 have been measured on Be-9, C-12, and Al-27 targets at 64 and 42 MeV/nucleon by the transmission method. From the energy dependence of the sigma(R) including the high energy data, the density distribution of Ne-17 was deduced through a modified Glauber-type calculation. It is indicated that Ne-17 has a long tail in the density, consistent with a (2s(1/2))(2)-dominant configuration of two valence protons.

DOI： 10.1103/PhysRevC.82.044309

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

(238)U projectile fragments have been created at the entrance of the fragment separator FRS, spatially separated in flight within 0.45 mu s and injected into the storage-cooler ring ESR at 7.9 Tm corresponding to about 70% light velocity. Accurate new mass values and lifetime information of the stored exotic nuclei in the element range from platinum to uranium have been obtained with single-particle Schottky spectrometry. In this experiment the new isotopes of (236)AC, (224)At, (221)Po, (222)po, and (213)Tl were discovered. The isotopes were unambiguously identified and their masses measured. In addition, the time-correlated data have provided information on the lifetime of the new nuclides. The discovery of isotopes along with accurate mass measurement has been achieved for the first time at the FRS-ESR facility. The results will contribute to the knowledge of the decay products from the r-process nuclei and enable a crucial test of the predictive power of modern nuclear mass and half-life models. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physletb.2010.05.078

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD  

Interaction cross sections (sigma(I)) for Ne isotopes from the stability line to the vicinity of neutron-drip line have been measured using the RIBF facility at RIKEN. Measurements have been performed for (20-32)Ne on C target at energies around 240 MeV/nucleon. A large enhancement of sigma(I) beyond the systematics of stable nuclei have been observed for neutron-rich Ne isotopes. The possible halo structures with lower orbital angular momentum for (29,31)Ne are discussed by the preliminary analysis.

DOI： 10.1142/S021773231000054X

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：PHYSICAL SOC JAPAN  

A search for new isotopes using in-flight fission of a 345 MeV/nucleon U-238 beam has been carried out at the RI Beam Factory at the RIKEN Nishina Center. Fission fragments were analyzed and identified by using the superconducting in-flight separator BigRIPS. We observed 45 new neutron-rich isotopes: Mn-71, Fe-73,Fe-74, Co-76, Ni-79, Cu-81,Cu-82, Zn-84,Zn-85, Ga-87, Ge-90, Se-95, Br-98, Kr-101, Rb-103, Sr-106,Sr-107, Y-108,Y-109, Zr-111,Zr-112, Nb-114,Nb-115, Mo-115,Mo-116,Mo-117, Tc-119,Tc-120, (121,122,123),Ru-124, Rh-123,Rh-124,Rh-125,Rh-126, Pd-127,Pd-128, Cd-133, Sn-138, Sb-140, Te-143, I-145, Xe-148, and Ba-152.

DOI： 10.1143/JPSJ.79.073201

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

The charge-changing cross sections (sigma(cc)) of Si-28 on a carbon target were measured with high precision at intermediate energies from 100 to 600 MeV/nucleon. The measured scc decreases rapidly from low energies up to 200 MeV/nucleon, whereas at higher energies it appears almost constant. The energy dependence of scc is compared with a Glauber-type model calculation where only the proton distribution of Si-28 is taken into account. A phenomenological correction factor deduced from the present data satisfactorily reproduces the experimental scc for other stable nuclei, whose charge distributions were determined by electron scattering and muon capture experiments.

DOI： 10.1103/PhysRevC.82.014609

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD  

Reaction cross sections for (11)Be and (8)B on proton targets at 40A - 120A MeV have been measured by the transmission method. With these data, we can discuss the proton-and neutron-density distributions at the nuclear surface independently in principle using the Glauber theory. Our experimental results support that the constituent of halo in (11)Be is neutron dominantly and that of (8)B is proton dominantly.

DOI： 10.1142/S0217732310000915

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPRINGER  

The degrees of polarization of proton rich nucleus P-28 produced in charge exchange reactions Si-28 + Be-9 -> P-28 + X, and Si-28 + H-1 -> P-28 + X have been observed at 100 A MeV. Utilizing thus obtained polarized nuclei, the magnetic moment of P-28 was remeasured, and vertical bar mu(P-28)vertical bar = 0.3115 (34) mu(N) was obtained. beta-nuclear quadrupole resonance (beta-NQR) of P-28 implanted in alpha-Al2O3 have been observed for the first time, in order to measure the electric quadrupole moment of this nucleus.

DOI： 10.1007/s10751-010-0253-9

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPRINGER  

Nuclear magnetic resonance measurement has been performed for Pt-197 oriented at 7 mK in a Ni host. The magnetic hyperfine splitting frequency at external magnetic fields of 0.2, 0.4 and 0.6 T were determined to be 229.4(1), 228.2(2) and 226.9(3) MHz, respectively. By using published values of the magnetic resonance frequency of (PtNi)-Pt-197 and magnetic moments determined by atomic beam methods, the hyperfine anomaly between the two isotopes is deduced to be (191)Delta(197) = +13(5)%. Which is extremely large compared to the theoretical value of +0.2%. Based on the same reasoning, the hyperfine anomaly with Pt-195, an isotope with the same spin and parity, is found to be (195)Delta(197) = +15(5)%. We conclude therefore that the published magnetic moment of Pt-197 is more likely in error. If we assume the hyperfine anomaly (195)Delta(197) = 0, a magnetic moment mu(Pt-191) = 0.45(1) mu(N) is obtained.

DOI： 10.1007/s10751-010-0252-x

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

The core-excited isomer in fully-ionized Sb-133 has been directly studied for the first time by applying the novel technique of isochronous mass spectrometry at GSI. The neutron-rich nuclides in high charge states were produced by projectile fission of 411 MeV A U-238 ions, separated in flight by the fragment separator (FRS) and stored in the isochronous storage ring (ESR). The measured excitation energy is 4.56(10) MeV. The neutral-atom half-life is known to be 17 mu s. This is the shortest-lived isomer measured directly with mass spectrometry techniques. The extended in-flight half-life of the bare ions in the ESR, which is due to the exclusion of the strong internal conversion, demonstrates that there should be another nuclear level above that identified from isomer-decay spectroscopy, in support of shell-model calculations. This measurement opens up a new half-life domain for storage-ring measurements. (c) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physletb.2010.04.020

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPRINGER  

Nuclear magnetic resonance on oriented nuclei (NMR-ON) on Fe-59 isotope in Ni was performed. The magnetic hyperfine splitting frequency of was determined to be nu(B-0 = 0) = 48.32 (2) MHz. Using the known magnetic moment the magnetic hyperfine field was deduced as B-HF = -28.32 (5) T. The effective nuclear spin-lattice relaxation time was also measured. The measured value is compared with experimental values of 3d-impurity in nickel host.

DOI： 10.1007/s10751-010-0264-6

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPRINGER  

The beta-NMR study of short-lived nucleus Cu-58 (I-pi = 1(+), T-1/2 = 3.2 s) in Si has been performed. Spin polarization of Cu-58 induced by the charge exchange reaction of Ni-58 was observed in Si at 15 K. The Cu-58 magnetic moment |mu[Cu-58]vertical bar = (0.46 +/- 0.03)mu(N) deduced from the beta-NMR spectrum is consistent with the previous results on the laser spectroscopy. The present result shows that the Cu-58 nucleus is promising as a new nuclear probe for the microscopic study of Cu impurities in Si.

DOI： 10.1007/s10751-010-0249-5

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

We report recent situation of anomaly in spin expectation value found in C-9-Li-9 mirror pair, recent analysis of the nuclear spin in terms of orbital or intrinsic and proton or neutron, and a result from the study of the G-parity conservation law through beta-ray angular correlation in terms of its nuclear orientation.

DOI： 10.1016/j.nuclphysa.2010.01.055

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Reaction cross sections (sigma(R)) for Be-11 and B-8 on proton targets at 50A similar to 120A MeV have been measured to distinguish between the proton- and neutron- density distributions at the nuclear surface. The sigma(R) is connected with the nucleon density distributions by the Glauber theory. Since the nucleon-nucleon total cross sections in that energy region have a large isospin dependence, the sigma(R) on proton targets should have a large difference between the proton and neutron in the halo structure. The experimental sigma(R) on proton targets are in good agreement with the calculated ones assuming that the tail dominantly consists of a neutron for Be-11 and a proton for B-8.

DOI： 10.1016/j.nuclphysa.2010.01.067

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

The spin lattice-relaxation rates of short-lived unstable nuclei Al-25 and (28)p if, Pt has been measured by means of the beta-NMR technique, in order to study the electronic structure of dilute impurities in Pt. From the obtained spin-lattice relaxation rates, Knight shifts K-c were estimated to be K-c[Al in Pt] = (0.45 +/- 0.09)x10(-3) and K-c[P in Pt] = (4 +/- 2 4) x 10(-3) using the Korringa relation. These values were evaluated by comparing to the first principle Calculations.

DOI： 10.1016/j.nuclphysa.2010.01.144

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Interaction cross sections (sigma(I)) for neutron-rich Ne isotopes, Ne28-32 on C target have been measured at 240A MeV using the RIBF at RIKEN. A large enhancement of sigma(I) beyond the systematics of stable nuclei have been observed for neutron-rich Ne isotopes, particularly for Ne-31. The possible halo structure for Ne-29,Ne-31 which would be caused by the lowering of the pf-shell and nuclear deformation of Ne isotopes are discussed by the preliminary analysis.

DOI： 10.1016/j.nuclphysa.2010.01.052

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

The magnetic dipole (mu) and electric quadrupole (Q) moments of short-lived nucleus F-22 (I-pi = 4(+), T-1/2 = 4.2 s) have been measured for the first time by means of the beta-NMR technique. A spin polarized F-22 beam was produced through the charge exchange reaction of Ne-22 and was implanted into single crysltals of NaF and MgF2 for mu and Q measurements, respectively. As a result,vertical bar mu(F-22)vertical bar = (2.69443 +/- 0.00039)mu(N) and vertical bar Q(F-22)vertical bar = (3 +/- 2) mb was obtained. These values are well reproduced by the shell model calculations.

DOI： 10.1016/j.nuclphysa.2010.01.022

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Interaction cross sections have been measured for spin-aligned nuclear beams of deformed nucleus. The spin-aligned nuclear beams were created by selecting the momentum of fragments produced in the projectile fragmentation of intermediate energy heavy-ion beams. The directional correlation of nuclear reaction probability for heavy-ion beams of deformed nucleus has been directly observed for the first time.

DOI： 10.1016/j.nuclphysa.2010.01.064

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

Reaction cross sections (sigma(R)) for C-19, C-20 and the drip-line nucleus C-22 on a liquid hydrogen target have been measured at around 40A MeV by a transmission method. A large enhancement of sigma(R) for C-22 compared to those for neighboring C isotopes was observed. Using a finite-range Glauber calculation under an optical-limit approximation the rms matter radius of C-22 was deduced to be 5.4 +/- 0.9 fm. It does not follow the systematic behavior of radii in carbon isotopes with N <= 14, suggesting a neutron halo. It was found by an analysis based on a few-body Glauber calculation that the two-valence neutrons in C-22 preferentially occupy the 1s(1/2) orbital.

DOI： 10.1103/PhysRevLett.104.062701

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AMER INST PHYSICS  

Reaction cross sections for stable nuclei at intermediate energies have been measured precisely and systematically. The data have been found to be reproduced nicely by the optical-limit approximation of Glauber theory modified to include the nucleon multiple scattering effect and the Fermi-motion effect. Applying this prescription, the nucleon density distribution of Ne-17 has been studied. The surface structure of B-8 and Be-11 has been also studied using this prescription and hydrogen targets. Using the RIBF that has just started application to studies of exotic nuclei, neutron-rich Ne isotopes around the Island of Inversion have been investigated through measurements of their interaction cross sections.

DOI： 10.1063/1.3455949

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AMER INST PHYSICS  

We have searched for a time-modulated decay in a standard electron capture experiment for (140)pr in order to confirm a report from GSI, where an oscillatory decay has been observed for hydrogen-like Pr-140 and Pm-142 ions in the cooler storage ring. Pr-140 has been produced with the Ce-140(p, n) reaction by a pulsed proton beam accelerated from the Van de Graaff accelerator at Osaka University. Resultant time dependence of the k(alpha) and K-beta X-ray intensities from the daughter shows no oscillatory behavior.

DOI： 10.1063/1.3442597

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AMER INST PHYSICS  

The magnetic moment of P-28 (I-pi = 3(+), T-1/2 = 270.3 ms) has been measured precisely by means of beta-NMR technique. The obtained magnetic moment is vertical bar mu(P-28)vertical bar = 0.3115 (34) mu(N). Combined with the magnetic moment of its mirror partner Al-28, the nuclear spin I = 3 is decomposed into its 4 components. The measurement of the Q moment has also been tried. From the preliminary NQR spectrum, it was found that the quadrupole coupling constant eqQ/h may be slightly larger than the prediction, which may show enhancement of the Q moment.

DOI： 10.1063/1.3442605

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

Precise measurements of the reaction cross sections (sigma(R)) for C-12 on Be, C, and Al targets and Be-11 on Be targets were performed in the energy range between 30 and 400 MeV/nucleon. The energy dependencies of sigma(R) for C-12, Be-11, and B-8 were compared to Glauber-type calculations performed using reliable nucleon-density distributions that are supported by experimental data. It was found that the Glauber-type calculations, which include the higher-order multiple scattering effect, the finite-range effect, and the Fermi-motion effect of nucleons in the nucleus, seem to provide a good prescription relating sigma(R) at intermediate energies to a proper nucleon-density distribution. This method provides a powerful tool with which to study the nuclear surface structure through the sigma(R) measurements.</p>.

DOI： 10.1103/PhysRevC.79.061601

Web of Science

researchmap

Language：English   Publisher：AMER PHYSICAL SOC  

DOI： 10.1103/PhysRevLett.102.139904

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

Time-resolved Schottky mass spectrometry has been applied to uranium projectile fragments which yielded the mass value for the Hg-208 (Z=80, N=128) isotope. The mass excess value of ME=-13 265(31) keV has been obtained, which has been used to determine the proton-neutron interaction strength in Pb-210, as a double difference of atomic masses. The results show a dramatic variation of the strength for lead isotopes when crossing the N=126 neutron shell closure, thus confirming the empirical predictions that this interaction strength is sensitive to the overlap of the wave functions of the last valence neutrons and protons.

DOI： 10.1103/PhysRevLett.102.122503

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：CHINESE PHYSICAL SOC  

Nuclear structure of proton-rich unstable nucleus P-28 has been studied by measuring its g-factor for the first time. The g-factor of P-28 (I-pi = 3(+,) T-1/2 = 270.3 ms) was measured by means of beta-NMR technique combined with the new polarization technique for charge exchange reaction product in the intermediate energy heavy ion collisions. The obtained g-factor of g=0.1028(27) is very much quenched from the Schmidt value. but is well reproduced by the shell model (+0.102). In connection with the magnetic. moment. of the mirror partner and the beta-ray transition probability, the orbital angular momenta and intrinsic spins of protons and neutrons have been determined as < l(p)> = 0.43(29), < l(n)> = 1.85(29), < S-p > = 0.28(4), and < S-n > = 0.44(4).

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD  

The cyclotron-like storage ring dedicated to Rare-RI Ring project consists of 6 magnetic sectors and 6 straight sections, having a circumference of 56.13 m. The magnetic sector works for both bending and focusing. The total circulation is assumed to be 1,000 turns. Over the momentum range from 1% to +1% in Delta p/p, the required isochronisity is 10(-6) while the beam emittance is sevaral tens of pi mm-mrad. To examine the design of cyclotron-like storage ring and fix its parameters, we have developed a high precision beam optics simulation. To achieve the precision as high as possible with in a feasible computational time, we have adopted a geometrical tracking assuming a circular orbit for a small spatial segment. For that purpose, it is enough that the magnetic sector is divided into 150 sub-sectors in calculation. In each sub-sector, the magnetic field is given as a function of radial position but uniform around the vicinity of beam trajectory. The beam trajectory is evaluated in 4th order Runge-Kutta algorithm. Finally, we have achieved a precision of 10(-9) in Delta T/T and a computational time of 1.8 sec on atypical PC server for ray tracing of single particle undergoing a circulation of 1,000 turns.

DOI： 10.1142/S0218301309012550

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD  

We are going to construct a precise mass-measurement apparatus; "Rare-RI Ring" at RIKEN RI Beam Factory and measure masses of exotic neutron-rich nuclei far from the stability line with the assistance of high intensity primary beam from the cyclotrons at RIBF. The present status of our project and the progress of some parts of Rare-RI Ring will be presented.

DOI： 10.1142/S0218301309012501

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD  

Precise mass measurements of short-lived exotic nuclei are very important for the understanding of basic nuclear structure physics and astrophysical nucleosynthesis in nature, as well as for the test and the development of theoretical nuclear mass models. At GSI, the Isochronous Mass Spectrometry (IMS) dedicated to mass measurements of short-lived nuclides was developed. In this contribution, the IMS technique is briefly reviewed. Recently, the first large-scale measurement on the (238)U fission fragment was done successfully. The measured mass values are in excellent agreement with the recent Penning trap data, however, they show a systematical deviation from the values in the latest atomic mass evaluation. Some representative results from this experiment will be presented, including their impact on nuclear structure physics and astrophysical r-process nucleosynthesis.

DOI： 10.1142/S0218301309012379

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AMER INST PHYSICS  

An open problem in Nuclear Astrophysics concerns the understanding of electron-screening effects on nuclear reaction rates at stellar energies. In this framework, we have proposed to investigate the influence of the electron cloud on alpha-decay by measuring Q-values and alpha-decay half-lives of fully stripped, H-like and He-like ions. These kinds of measurements have been feasible just recently for highly-charged radioactive nuclides by fragmentation of U-238 at relativistic energies at the FRS-ESR facility at GSI. In this way it is possible to produce, efficiently separate and store highly-charged alpha-emitters. Candidates for the proposed investigation were carefully selected and will be studied by using the Schottky Mass Spectroscopy technique.
In order to establish a solid reference data set, lifetimes and Q(alpha)-value measurements of the corresponding neutrals have been performed directly at the FRS, by implanting the separated ions into an active Silicon stopper.

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

The one- and two-neutron removal reactions from (17)C and (18)C as well as the reaction cross section of (18)C have been studied using a carbon target at 80A MeV. The longitudinal momentum distributions of (15,16)C fragments from (17)C and (16,17)C fragments from (18)C were measured by a direct time-of-flight method. The width of (15)C fragments from (17)C is fairly smaller than that from other C isotopes. The experimental data are discussed within the framework of the Glauber model.

DOI： 10.1103/PhysRevC.78.054313

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

The previously pioneered Isochronous Mass Spectrometry (IMS) has been extended by an additional precise magnetic-rigidity determination to enable accurate large-scale measurements of stored short-lived relativistic nuclei with the FRS-ESR facility at 382 MeV/u. With this novel experimental tool the mass resolving power and accuracy have been improved by a factor of about 3. The recorded broad-band revolution time spectrum corresponds to the mass-over-charge range of about 6%. A mass resolving power of 200 000 (FWHM) and a typical accuracy of 120 keV have been achieved almost over the entire spectrum. The masses of 35 neutron-rich nuclides have been directly measured in the element range from aluminum to barium. The Masses of 8 nuclides (As-85,As-86, Se-89, Ag-123, Te-138, I-140,I-141, Xe-143) have been measured for the first time. The results are compared with previous experimental data and theoretical predictions. The evolution of the N = 50 shell closure towards doubly-magic Ni-78 is discussed. (c) 2008 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nuclphysa.2008.08.013

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：CHINESE PHYSICAL SOC  

The longitudinal momentum distribution (P-//) of fragments after one-proton removal from Al-23 and reaction cross sections (sigma(R)) for Al-23,Al-24 on carbon target at 74A MeV have been measured simultaneously. An enhancement in sigma(R) is observed for Al-23 compaxed with Al-24. The full width at half maximum of the P-// distribution for Mg-22 fragments has been determined to be 232 +/- 28 MeV/c. Analysis of P-// using the Few-Body Glauber Model indicates a dominant d-wave configuration for the valence proton in the ground state of Al-23. The exotic structure in Al-23 is discussed.

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

We have tested the timing properties of several thin plastic scintillators (10-500 mu m) designed for the Rare-RI Ring project at the R I beam factory. The experiments were performed at the heavy-ion synchrotron facility, HIMAC (Heavy Ion Medical Accelerator in Chiba), using a Xe beam with an energy of 200 MeV/nucleon. The scintillation light was read Out by fast-timing photomultipliers through standard fishtail-shaped light guides. The resultant timing resolutions reached a few tens of picoseconds, which satisfied our requirement for the project. We also measured charge-state distributions for Xe42+ and Fe20+ ions penetrating carbon foils of 10-500 mu g/cm(2) thickness. The results were compared with a theoretical model calculation for charge-state evolution. (c) 2008 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nimb.2008.05.085

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

A new apparatus named "Rare-RI Ring", for precisely measuring the masses of short-lived rare nuclei including the r-process region is proposed. The Rare-RI Ring is one of the major experimental installations at the RI KEN RI beam Factory. It consists of three main parts: a long injection beam line, a fast kicker system and a cyclotron-like storage ring. The combination of a long injection beam line and a feast kicker system enables Lis to inject short-lived rare nuclei into the ring one by one. The revolution time of each nucleus in the ring is measured with all accuracy of better than 10(-6). Overall, the masses of short-lived rare nuclei including the r-process region can be determined with an order of 10(-6) precision. (c) 2008 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nimb.2008.05.081

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

Interaction cross sections (sigma(I)) of Kr-72,Kr-76,Kr-80 on a C target were measured at the projectile fragment separator FRS at GSI. Effective matter radii of the nuclei were deduced by a Glauber model analysis so as to reproduce the experimental sigma(I). An increase of matter radii toward the proton drip-line is observed. We compare the extracted radii to theoretical predictions, which are based on Skyrme-Hartree-Fock-Bogoliubov (SHFB) and on relativistic mean field (RMF) approaches. The enhancement of the matter radius observed in Kr-72 is discussed.

DOI： 10.1103/PhysRevC.77.034315

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：JAGIELLONIAN UNIV PRESS  

For precision mass measurements of short-lived rare isotopes, a new experimental apparatus, named "Rare-RI Ring", has recently been proposed. A unique possibility of the project is discussed, comparing with other experimental techniques. The current status is presented.

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD  

The longitudinal momentum distribution (P-parallel to) of fragments after one-proton removal from Al-23 and reaction cross sections (sigma(R)) for Al-23,Al-24 on carbon target at 74AMeV have been measured using 135AMeV Si-28 primary beam on RIPS in RIKEN. P-parallel to is measured by a direct time-of-flight (TOF) technique, while sigma(R) is determined using a transmission method. An enhancement in sigma(R) is observed for Al-23 compared with Al-24. The P-parallel to for Mg-22 fragments from Al-23 breakup has been obtained for the first time. FWHM of the distributions has been determined to be 233 +/- 14 MeV/c. The experimental data are discussed by use of the Few-Body Glauber Model (FBGM). Analysis of P indicates a dominant d-wave configuration for the valence proton in the ground state of Al-23. The possibility of an enlarged Mg-22 core for proton-rich nucleus Al-23 is demonstrated..

DOI： 10.1142/9789812837530_0015

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

The magnetic moment of short lived beta-emitter (24m)Al (426 keV, I(pi) = 1(+), T(1/2) = 131 ms) has been measured by means of beta-NMR technique, for the first time. From the beta-NMR spectrum, the magnetic moment was determined as vertical bar mu((24m)Al)vertical bar = (2.99 +/- 0.09) mu(N). Combined with the known magnetic moment of the mirror partner (24m)Na, the expectation value of <S(z)> is obtained to be (0.08 +/- 0.12). These values are reproduced well by the shell model calculation.

DOI： 10.1007/s10751-008-9687-8

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：EDP SCIENCES S A  

The interaction cross-sections of neutron-deficient Kr-72,Kr-76,Kr-80 isotopes have been measured by use of the transmission method at relativistic energies. Based on the Glauber model analysis effective root-mean-square matter radii of these nuclei have been determined for the first time. A systematic evolution of the matter radii in the mass A similar to 70 region is discussed and compared with that of light nuclei.

DOI： 10.1140/epjst/e2007-00303-8

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

We measured the polarization of the beta-emitting Ne-23 (I-pi = 5/2(+), T-1/2 = 37.24 s) and Al-25(I-pi = 5/2(+), T-1/2 = 7.18 s) produced through the one nucleon pickup reactions and Al-24m(I-pi = 1(+), T-1/2 = 131 ms, E-ex = 426 keV) and P-28(I-pi = 3(+), T-1/2 = 270 ms) produced through charge-exchange reactions in the intermediate energy heavy ion collisions. We compared them with those from the projectile fragmentation process. The larger polarization seems to persistently be positive throughout the momentum distribution, and sharper momentum distributions suggest that nuclear friction mechanism is responsible for the polarization phenomena.

DOI： 10.1007/s10751-008-9690-0

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

Nuclear magnetic resonance on oriented nuclei (NMR-ON) on Sc isotopes (A = 44, 44 m, 46, 47) in Fe were performed. Using the known magnetic moments the magnetic hyperfine fields were determined. The hyperfine anomalies of various Sc were deduced; (44)Delta(47) = 0.0 (12) %, (44)m Delta(47) = 1.2 (4) %, (46)Delta(47) = 2.7 (8) %. The measured hyperfine anomalies are briefly discussed based on the shell model.

DOI： 10.1007/s10751-008-9683-z

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

Nuclear magnetic resonances were measured for (48)Sc and (44m)Sc oriented at 8 mK in an Fe host metal. The magnetic hyperfine splitting frequencies at an external magnetic field of 0.2 T were determined to be 63.22(11) MHz and 64.81(1) MHz for (48)Sc and (44m)Sc, respectively. With the known magnetic moment of mu((44m)Sc) = + 3.88 (1) mu(N), the magnetic moment of (48)Sc is deduced as vertical bar mu((48)Sc)vertical bar = 3.785 (12) mu(N). The measured magnetic moment of (48)Sc is discussed in terms of the shell model using the effective interactions.

DOI： 10.1007/s10751-008-9689-6

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

The magnetic moment of (28)P (I(pi) = 3(+), T(1/2) = 270.3 ms) in the ground state has been measured by the beta-nuclear magnetic resonance method for the first time. The measured magnetic moment of vertical bar mu((28)P)vertical bar = 0.309( 9) mu(N) is well reproduced by the shell model value of +0.306 mu(N). The shell model calculation also yields a proton density distribution with a long tail. The present results provide a strong confirmation of the configuration of the 2s(1/2) proton which should lead to the proton halo.

DOI： 10.1007/s10751-008-9625-9

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

The electric quadrupole (Q) moment of short-lived nucleus Al-25 (I-pi = 5/2(+), T-1/2 = 7.18 s) has been measured for the first time, by means of the beta-NQR technique. The spin polarization of Al-25 was produced in heavy ion collisions and was kept in a alpha-Al2O3 single crystal for as long as 2 s and the quadrupole coupling frequency was obtained as vertical bar eqQ/h(Al-25 in Al2O3)vertical bar = (4.05 +/- 0.30) MHz. From the result, the Q moment was determined as vertical bar Q(Al-25)vertical bar = (240 +/- 20) mb. The present

DOI： 10.1007/s10751-008-9686-9

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

The longitudinal momentum distribution (P-//) of fragments after one-proton removal from Al-23 and reaction cross sections (sigma(R)) for Al-23,Al-24 on a carbon target at 74A MeV have been measured. The Al-23,Al-24 ions were produced through projectile fragmentation of 135A MeV Si-28 primary beam using the RIPS fragment separator at RIKEN. P-// is measured by a direct time-of-flight (TOF) technique, while sigma(R) is determined using a transmission method. An enhancement in sigma(R) is observed for Al-23 compared with Al-24. The P-// for Mg-22 fragments from Al-23 breakup has been obtained for the first time. FWHM of the distributions has been determined to be 232 +/- 28 MeV/c. The experimental data are discussed by using the Few-Body Glauber model. Analysis of P-// demonstrates a dominant d-wave configuration for the valence proton in ground state of Al-23, indicating that Al-23 is not a proton halo nucleus.

DOI： 10.1103/PhysRevC.76.031601

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

The beta-NMR of the probe atom (12)B implanted in In-doped germanium was measured as a function of temperature. As a result, three resonances were observed: sharp and broad resonances around the Larmor frequency and a resonance split by the electric quadrupole interaction. It was found that the appearance of the resonances is similar to the case of Si host (Izumikawa et al. Hyperfine Interact. 136/137:559-605, 2001). The quadrupole coupling constant for the split resonance was deduced as vertical bar eqQ/h vertical bar = 252(3) kHz under the assumption that it has < 111 > axial symmetry. And furthermore, assuming that the defect atom jumps thermally between the identical defect sites, the activation energy of the jump was deduced as 0.4 +/- 0.1 eV.

DOI： 10.1007/s10751-008-9661-5

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

The spin-lattice relaxation times T-1 for short-lived beta emitters Al-25(I = 5/2, T-1/ 2 = 7.2 s) and P-28(I = 3, T-1/2 = 270 ms) in Pt were measured by means of the beta-NMR technique. As a result, T-1[Al-25 in Pt] = (1.1(- 0.3)(+0.7)) s and T-1[P-28 in Pt] > 0.5 s were obtained at temperatures of 17 and 20 K, respectively. The Knight shifts were estimated from the Korringa relation, which were evaluated by comparing to the first principle calculations.

DOI： 10.1007/s10751-008-9662-4

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Schottky Mass Spectrometry (SMS) and Isochronous Mass Spectrometry (IMS) have been successfully applied for direct mass measurements of exotic nuclides at FRS-ESR facility at GSI. Both experimental methods are sensitive to single stored ions and can cover very efficiently a large number of nuclides in one run. Presently, more than 1100 masses of different nuclides have been covered by SMS and IMS in several FRS-ESR experiments whereby about 350 of them have been determined for the first time. In this paper, we present the status of our experimental program and use the experimental mass values to test the predictive power of modern mass models.

DOI： 10.1016/j.nuclphysa.2006.12.050

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Interaction cross-sections of Kr-72,Kr-76,Kr-80 on a C target were measured at the projectile fragment separator FRS at GSI. We deduced the effective matter radii of the nuclei by a Glauber model analysis. An increase of matter radii toward the proton drip-line was observed.

DOI： 10.1016/j.nuclphysa.2006.12.070

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AMER INST PHYSICS  

The interaction cross-sections of neutron-deficient Ar and Kr isotopes were precisely measured using the fragment separator FRS at relativistic energies. Based on Glauber model analysis, effective root-mean-square matter radii of these nuclei were determined. Using charge radii obtained from isotope-shift measurements, an evolution of proton skins for Ar isotopes is clearly shown. A systematics of the matter radii in the mass region A similar to 70 is also discussed.

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AMER INST PHYSICS  

Reaction cross sections (sigma R) for C-12 beam on Be-9, 12C, and Al-27 targets and for Be-11 beam on 9Be target were precisely measured systematically in the intermediate energy range. It is indicated that these all sigma(R) data were successfully reproduced by a modified Glauber calculation, which is expected to be applied for the determination of density distributions of other exotic nuclei.

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AMER INST PHYSICS  

Reaction cross sections (sigma(R)) for He-6 and He-8 have been measured on Be-9, C-12, and Al-27 targets at intermediate energies. We deduced the nucleon density distribution of He-6 and He-8 through our data with the use of modified Glauber calculation. This method is a sensitive probe for dilute nucleon density and we successfully clarified the halo structure of He-6 and the neutron skin-type density distribution of He-8.

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AMER INST PHYSICS  

We measured the polarization of the beta-emitting Ne-23 (I-pi = 5/2(+), T-1/2 = 37.24 s) and 25Al(I-pi = 5/2(+), T-1/2 = 7.18 s), produced through the one nucleon pickup reactions in the intermediate energy heavy ion collisions, and was compared with those from the projectile fragmentation process. The larger polarization which seems to persistently be positive throughout the momentum distribution, and sharper momentum distributions suggest nuclear friction mechanism to be responsible for the polarization phenomena. Using such a large polarization, magnetic moment of 23Ne and the quadrupole moment of 25AI were measured. The obtained values are vertical bar mu(Ne-23)vertical bar = 1.0817(9),mu(N) and vertical bar Q(Al-25)vertical bar = (240 +/- 20) mb.

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AMER INST PHYSICS  

The combination of the in-flight separator FRS and the storage-ring ESR at GSI offers unique possibilities for high accuracy mass and lifetime measurements of bare and few-electron fragments. Operating the ESR in the isochronous mode allows for measurements of revolution frequencies of stored ions without cooling. Isochronous Mass Spectrometry (IMS) can be applied to fragments with half-lives as short as several tens of microseconds. Newly developed magnetic rigidity tagging increases the resolving power of IMS to about 500000. IMS can be used to measure masses of nuclei with rates even lower than one ion per day, a property also needed for the purpose of the ILIMA project at the future facility FAIR.

Web of Science

researchmap

Language：Chinese   Publishing type：Research paper (scientific journal)   Publisher：SCIENCE CHINA PRESS  

We measured the reaction cross sections(sigma(R)) and parallel momentum distributions(P-//) of Al-23 and it's neighboring nuclei at RIKEN-RIPS. An enhanced sigma(R) of Al-23 is observed, which is consistent with the previous experimental result. And the P-// of fragment from the projectile breakup nuclei have been obtained at the same time. We discuss our experimental data under the Few-Body Glauber Model. The P-// of Al-23 shows the ground state of the valence proton is a d-wave, which is consistent with the recent measurement of Al-23's g factor. To explain the experimental sigma(R) and P-// of Al-23 at the same time, we suggest an enlarged core of Al-23.

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD  

The longitudinal momentum (p(//)) distributions of fragments after one-proton removal and reaction cross sections (sigma R) for several N = 10 isotones at intermediate energy (similar to 70A MeV) have been measured simultaneously at the RIken Projectile fragment Separator (RIPS). p(//) was measured using a direct time-of-flight (TOF) technique, while sigma(R) was determined using a transmission method. An enhanced sigma(R) is observed for Al-23 comparing with its neighbors. The p(//) distribution for Mg-22 fragments from Al-23 one-proton removal reaction has been obtained for the first time. The experimental data are discussed within a Few Body Glauber (FBG) framework. Analysis of p// indicates a dominant d-wave component in the ground state of Al-23. This agrees with recent experimental results. We also suggest the possibility of an enlarged Mg-22 core for proton-rich nucleus Al-23.

DOI： 10.1142/S0218301306005101

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

Production cross sections for the projectile fragmentation of a 1.05A GeV Kr-80 beam on a Be target were measured at the projectile fragment separator FRS at GSI. Cross sections were obtained for isotopes of the elements Ge to Kr close to the proton drip line. These data are compared to the results of the empirical parametrization EPAX and to abrasion-ablation calculations. We also compare the results to predictions of intranuclear-cascade calculations. The intranuclear-cascade calculations allow us to also compare well measured one-proton pickup cross sections.

DOI： 10.1103/PhysRevC.74.044608

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

For the first time, we obtained the g factor for the ground state of Al-23 by use of a beta-NMR measurement. Al-23 has a small proton separation energy and is a potential proton-halo candidate. The obtained g factor, vertical bar g vertical bar=1.557 +/- 0.088, clearly shows the spin and parity, J(pi)=5/2(+), for Al-23, which is the same as that of its mirror partner, Ne-23. The possible nuclear structure of Al-23 is also discussed.

DOI： 10.1103/PhysRevC.74.021301

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AMER INST PHYSICS  

The reaction cross sections and momentum distributions for Al-23 and its neighbouring nuclei have been measured at the Riken Projectile Fragment Separator (RIPS). The primary beam of 135 A MeV Si-28 was used to produce the secondary beams. The measurement of sigma(R) was carried out by using a transmission-type method. sigma(R) was determined by the ratios between incident and outgoing particles without reaction from both target-in and target-out measurements. P-// of fragment from breakup reactions was determined from the measured TOF between F2 and F3. An enhancement is observed in sigma(R) for Al-23 compared to its neighbors. The P-// of Mg-22 fragments from Al-23 breakup have been obtained. The width of the distributions is found to be consistent with prediction by the Goldhaber Model. The experimental data are discussed in the framework of Glauber model. The analysis of P-// indicates a dominant d-wave component in the ground state of Al-23. This confirms the result of a recent magnetic moment measurement which indicates that the valence proton is in d-wave.

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AMER INST PHYSICS  

Recent progress is presented from experiments on masses and lifetimes of bare and few-electron exotic nuclei at GSI. Relativistic rare isotopes produced via projectile fragmentation and fission were separated in flight by the fragment separator FRS and injected into the storage ring ESR. This worldwide unique experimental technique gives access to all fragments with half-lives down to the microsecond range. The great research potential is also demonstrated by the discovery of new isotopes along with simultaneous measurements of mass and lifetime. Representative results from time-resolved Schottky mass spectrometry are compared with modern theoretical predictions. The measured isospin dependence of pairing-gap energies is not reproduced by conventional mass models. The first direct observation of bound-state beta decay has been achieved. Single particle decay measurements and the continuous recording of both stored mother and daughter nuclei open up a new era for spectroscopy. The combination of stochastic and electron cooling has allowed us to measure with Schottky analysis for the first time short-lived isomers. The future international NUSTAR facility at FAIR consisting of a new large-acceptance in-flight separator (Super-FRS) will be an ideal tool to study the r- and rp-process nuclei.

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AMER INST PHYSICS  

beta-NMR spectra have been observed for Cl-33, Al-23 and Ne-23. As a result, the magnetic moment of Cl-33 was determined as vertical bar mu(Cl-33)vertical bar = 0.7549(3) mu(N). Combined with the known magnetic moment of S-33 and the ft-value of the Cl-33 beta decay, the orbital angular momenta and the intrinsic spins for proton and neutron groups, are deduced separately as < l(p)> = 1.3, < I-n > = 0.3, < S-p > = -0.12 and < S-n > = -0.02. The magnetic moment of Al-23, and that of Ne-23 were determined as vertical bar mu(Al-23)vertical bar = 3.89(22) mu(N) and vertical bar mu(Ne-23)vertical bar = 1.0817(9) mu(N), respectively. As a result, the orbital angular momentum < l(z)> and the intrinsic spin < S-z > were deduced to be 2.09(29) and 0.41(29), respectively. Combined with theft-value of the 0 transition from the ground state of Al-23 to the excited state of Mg-23, proton and neutron contributions are separated. The obtained expectation values < l(p)>, < l(n)>, < S-p > and < S-n > are compared with the shell model predictions.

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：IOP PUBLISHING LTD  

One-nucleon removal reactions at relativistic energies have been used as a spectroscopic tool for obtaining information about the ground state of neutron-rich oxygen isotopes. Using the FRS at GSI, the longitudinal momentum distributions of the emerging fragments after breakup were measured along with the one-nucleon removal cross-sections. The relative contributions of the remaining fragments in their ground and excited states have been determined for a few cases from measurements of gamma rays in coincidence with the longitudinal momentum distribution.. The controversial case of O-23 has been directly addressed. Comparison of our exclusive momentum distributions for the one-neutron removal channel to theoretical momentum distributions calculated with an Eikonal model for the knockout process rendered a spin and parity of I-pi = 1/2(+) for the O-23 ground state. This result resolves the existent experimental discrepancy and supports sub-shell closure at N = 14 with a fairly pure 2s(1/2) neutron in O-23.
(Some figures in this article are in colour only in the electronic version).

DOI： 10.1088/0954-3899/31/10/045

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMERICAN PHYSICAL SOC  

We report the first measurement of a ratio lambda(beta b)/lambda(beta c) of bound-state (lambda(beta b)) and continuum-state (lambda(beta c)) beta(-)-decay rates for the case of bare Tl-207(81+) ions. These ions were produced at the GSI fragment separator FRS by projectile fragmentation of a Pb-208 beam. After in-flight separation with the B rho-Delta E-B rho method, they were injected into the experimental storage-ring ESR at an energy of 400.5A MeV, stored, and electron cooled. The number of both the Tl-207(81+) ions and their bound-state beta(-)-decay daughters, hydrogenlike Pb-207(81+) ions, were measured as a function of storage time by recording their Schottky-noise intensities. The experimental result, lambda(beta b)/lambda(beta c)=0.188(18), is in very good agreement with the value of 0.171(1) obtained from theory employing spectra of allowed transitions.

DOI： 10.1103/PhysRevLett.95.052501

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

A high-rate particle identification device for high-energy heavy ions has been developed which utilizes a stacked configuration of grid-less parallel plate gas ionization chambers with thin anode-cathode gaps. The high-rate capability of this chamber was realized by adopting bipolar shaping of anode signals and by the suitable choice of a counter gas. Z-resolutions of 0.2-0.3 were obtained for nuclear fragments of Ar-40 at 95 A MeV with an intensity as high as 10(6) cps. (C) 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nima.2004.08.100

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

Breakup reactions were used to study the ground-state configuration of the neutron-rich isotope O-23. The O-22 fragments produced in one-nucleon removal from O-23 at 938 MeV/nucleon in a carbon target were detected in coincidence with de-exciting gamma rays, allowing to discern between 220 ground-state and excited-states contributions. From the comparison of exclusive experimental momentum distributions for the one-neutron removal channel to theoretical momentum distributions calculated in an Eikonal model for the knockout process, and spin and parity assignment of I-pi = 1/2(+) was deduced for the 230 ground state. This result solved the existent experimental discrepancy.

DOI： 10.1140/epjad/i2005-06-149-2

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IOP PUBLISHING LTD  

The g-factor of the extremely proton-rich nucleus Al-23 (T-1/2 = 0.47s) has been measured by means of the O-NMR method for the first time. The g-factor were determined as vertical bar g vertical bar = 1.557(88) from the obtained NMR spectra. From the comparison between the experimental value and the shell model calculation, the spin parity of the ground state of Al-23 was determined as I-pi = 5/2(+). Thus, the magnetic moment of Al-23 was determined as vertical bar mu vertical bar = 3.89(22)mu(N).

DOI： 10.1088/1742-6596/20/1/032

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IOP PUBLISHING LTD  

The electric quadrupole coupling constant eqQ/h of Na-25 (I-pi = 5/2(+), T-1/2 = 59.6 s), implanted in a TiO2 single crystal, has been measured by use of the beta-NMR technique, to determine the electric quadrupole moment Q. As a result, vertical bar eqQ/h vertical bar = (44 +/- 16) kHz and vertical bar Q(Na-25)vertical bar = (1.0 +/- 0.4) mb were determined. From the NMR on 25Na in NaCl, the magnetic moment was determined as vertical bar mu vertical bar = (3.6832 +/- 0.0003) mu(N).

DOI： 10.1088/1742-6596/20/1/030

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

The optical limit of the Glauber theory with zero-range approximation, which is successfully used at high energies to connect the nucleon density distribution with reaction cross-sections (sigma(R)), gives somewhat smaller values of sigma(R) by 10-20% at intermediate energies. We have precisely measured the sigma(R) for C-12 on Be, C, and Al at 30A-200A MeV, and for Be-9 on Be at 70A-100A MeV to investigate the enhancement of sigma(R) compared to the optical-limit calculation. From the enhancements, we deduced the nucleon-nucleon range as a function of energies. We deduced the density distribution of B-8 analyzing the known experimental sigma(R) for B-8 with an enhancement correction or with the finite range effect as a test.

DOI： 10.1140/epjad/i2005-06-078-0

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

One-nucleon removal reactions at relativistic energies have been used as a spectroscopic tool to characterise the ground state properties of several neutron-rich isotopes in the sd-shell. Using the FRS at GSI, the longitudinal momentum distributions of the emerging fragments after one-nucleon removal were measured. The relative contributions of the remaining fragments in their ground and excited states have been determined from measurements of gamma rays in coincidence with the longitudinal momentum distributions. In particular the breakup of O-23 has been investigated. The interpretation of our measurements, in the framework of a simple theoretical model, favours a spin and parity assignment of 1/2(+) for the O-23 ground state in agreement with shell model predictions.

DOI： 10.1016/j.nuclphysa.2004.09.153

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

The magnetic moment of Cl-33 (I-pi = 3/2(+), T-1/2 = 2.51 s) has been re-measured precisely by beta-NMR method. The obtained magnetic moment \mu\ = 0.7549(3) mu(N) is consistent with the old value 0.7523(16) mu(N), but is 5 times more accurate. The value is well reproduced by the shell model calculation; mu(SM) = 0.70 mu(N). Combined with the magnetic moment of the mirror partner S-33, the nuclear matrix elements <l(p)>, <l(n)>, <S-p>, and <S-n> were derived.

DOI： 10.1016/j.nuclphysa.2004.09.075

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Recently, much progress has been made with stored exotic nuclei at relativistic velocities ((v)/(c) = 0.7). Fragments of Pb-208 and Bi-209 projectiles and fission products from U-238 ions were produced, separated in flight with the fragment separator FRS, and injected into the storage-cooler ring ESR for precision measurements. 114 new masses of neutron-deficient isotopes in the lead region have been measured with time-resolved Schottky Mass Spectrometry (SMS). A new isospin dependence of the pairing energy was observed due to the improved mass accuracy of typically 1.5 x 10(-7) (30 keV). New masses of short-lived neutron-rich fission fragments have been obtained with Isochronous Mass Spectrometry (IMS). An innovative field of spectroscopy has been opened up with lifetime measurements of stored bare and few-electron fragments after applying both stochastic and electron cooling.

DOI： 10.1016/j.nuclphysa.2004.09.030

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

The reaction cross section (sigma(R)) for the neutron-rich nucleus B-17 on a carbon target has been measured at an energy of 77A MeV by the transmission method. An enhancement of sigma(R) at intermediate energy compared to that at high energy was observed. The density distribution of B-17 was deduced through the energy dependence of sigma(R) using a finite-range Glauber-type calculation under an optical-limit approximation as well as a few-body approach. The existence of a long neutron tail in B-17 was demonstrated. The fraction of the wave function with)2)2 the valence two-neutron configuration of (2s(1/2))(J=0)(2) or (1d(5/2))(J=0)(2) was found to be 50+/-10% based on a finite-range few-body Glauber-type calculation.

DOI： 10.1103/PhysRevC.70.054320

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

Nuclear magnetic resonance on oriented nuclei was carried out using a sample of dilute Y-91 and Y-91m in iron prepared by ion implantation of radioactive precursor Rb isotopes. For (YFe)-Y-91, the beta-ray asymmetry was utilized to measure the magnetic hyperfine interaction frequency, nu(0)=73.566(22) MHz, which led to the magnetic hyperfine field, B-HF=-29.4(2)T, by using the known nuclear g-factor. The field shift of the resonant frequency, dnu(0)/dB(0)=-2.501(17) MHz/T for (YFe)-Y-91, implies a Knight shift value, K=0.0(8)%. The interaction frequency and the field shift of (YFe)-Y-91m obtained via the gamma-ray detection confirmed the previously reported results. A ratio of the measured nu(0) and dnu(0)/dB(0) values for both (YFe)-Y-91 and (YFe)-Y-91m gave rise to the hyperfine anomaly, (91)Delta(91m)=-4.2(8)%, which can explain discrepancies in the B-HF values of YFe as determined by various experiments.

DOI： 10.1103/PhysRevB.70.132405

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

Breakup reactions were used to study the ground-state configuration of the neutron-rich isotope O-23. The O-22 fragments produced in one-nucleon removal from O-23 at 938 MeV/nucleon in a carbon target were detected in coincidence with deexciting gamma rays. The widths of the longitudinal momentum distributions of the O-22 fragments and the one-neutron removal cross sections were interpreted in the framework of a simple theoretical model which favors the assignment of I-pi=1/2(+) to the O-23 ground state.

DOI： 10.1103/PhysRevLett.93.062501

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

The reaction cross section of C-17 on a carbon target at 79 A MeV has been measured by the transmission method. The density distribution of C-17 was deduced using the finite-range Glauber model (FRGM) combined with the interaction cross section of C-17 at high energy. The existence of a tail in the density distribution of C-17 is suggested to get a better understanding of both the low energy and high energy data. Under a core plus single-particle assumption, analysis shows a dominant d-wave of the valence neutron in C-17. (C) 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nuclphysa.2004.03.220

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

We present direct mass measurements of the short-lived V-44, Mn-48, Ti-41 and Cr-45 nuclei. A novel experimental method has been used that is based on projectile fragmentation, in-flight separation of relativistic heavy ions with the fragment separator (FRS). and on isochronous operation of the experimental storage ring (ESR). A mass resolving power of I 10 000 (FWHM) and an accuracy of about (100-500) keV has been achieved. The impact of the present results on the rp-process in X-ray burst models is discussed. (C) 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physletb.2004.02.014

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

Deeply bound 1s states of pi(-) in (115,119,123)Sn were preferentially observed using the Sn(d(3), He) pion-transfer reaction under the recoil-free condition. The 1s binding energies and widths were precisely determined and were used to deduce the isovector parameter of the s-wave pion-nucleus potential to be b(1) = -(0.115+/-0.007)m(pi)(-1). The observed enhancement of \b(1)\ over the free piN value (b(1)(free)/b(1) = 0.78+/-0.05) indicates a reduction of the chiral order parameter, f(pi)*(rho)(2)/f(pi)(2)approximate to0.64, at the normal nuclear density, rho=rho(0).

DOI： 10.1103/PhysRevLett.92.072302

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD  

The reaction cross section for the neutron-rich nucleus B-17 on a carbon target has been measured at an energy of 77 AMeV by a transmission method. A large enhancement of 17B reaction cross section at low energy was observed. The density distribution of 17B was deduced through the energy dependence of the reaction cross section together with high-energy data using a finite-range Glauber-model calculation under an optical-limit approximation. It is confirmed that the neutron-tail in the density distribution is necessary for 17B in order to reproduce the measured reaction cross sections. Based on the assumption of a core (B-15) plus valence two-neutron picture, the mixture of v(2s(1/2)) and V(1d(5/2)) was studied without treating the correlation between two neutrons.

DOI： 10.1142/9789812702401_0017

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

Recent studies of hyperfine fields B-HF of Sr and Y in Fe are briefly reviewed. The B-HF value of Y in Ni is given by NMRON of (YNi)-Y-91m. The nuclear mangetic moment of the ground state of Y-93 is extracted from the beta-ray detected NMRON of Y-93 Fe.

DOI： 10.1007/s10751-005-9106-3

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AMER INST PHYSICS  

One-nucleon removal reactions at relativistic energies have been used as spectroscopic tool to obtain information about the ground state properties of several neutron-rich isotopes in the sd-shell. Using the FRS at GSI, the longitudinal momentum distributions of the emerging fragments after one-nucleon removal cross-sections were measured. The relative contributions of the remaining fragments in their ground and excited states have been determined from measurements of gamma rays in coincidence with the longitudinal momentum distributions. The interesting case of O-23 Will be directly address. The interpretation of our experimental results in the framework of a simple theoretical model will favours a spin and parity assignment of 1/2(+) for the O-23 ground state in agreement with shell model predictions.

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AKADEMIAI KIADO  

Recent progress in experiments with exotic nuclear beams at the SIS-FRS-ESR facility is summarized. New results on gross properties of exotic nuclei like binding energy, half-lives, and decay modes are presented. A brief outlook to future experiments is given.

DOI： 10.1556/APH.19.2004.1-2.27

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

Magnetic properties of Pm ions in NdNiAl4 were investigated by low-temperature nuclear orientation of Pm-144. The observed gamma-ray anisotropy as a function of external fields revealed a change in the magnetic structure of Pm ions at the metamagnetic Phase transition of NdNiAl4. The extracted hyperfine field was 50(5) T which is substantially smaller than those previously reported.

DOI： 10.1007/s10751-005-9033-3

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

Nuclear magnetic resonance on oriented Hf-175 in iron host has been measured. Samples of (HfFe)-Hf-175 were made by recoil implantation of the precursor Ta-175 isotope. The resonance frequency and the resonance line width have been determined to be 139.0 (1) MHz and FWHM = 2.7 (2) MHz, respectively, in an external magnetic field of 0.1 T. The resonance width was very narrow compared with the previously reported value of 11.0 (1.1) MHz. With the known value of the magnetic moment of mu(Hf-175) = -0.62 (3) mu(N), the hyperfine field has been deduced as B-HF = -73.6 (3.5) T.

DOI： 10.1007/s10751-005-9032-4

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

Nuclear magnetic resonance measurement have been performed for W-185 oriented at 8 mK in in Fe host. The magnetic hyperfine splitting frequency at ail external magnetic field of 0.1 T was determined to be 196.6(2) MHz. With the known hyperfine field of B-hf=71.4(18) T, the nuclear magnetic moment of W-185 is deduced as mu(W-185)=+0.543(14) mu(N).

DOI： 10.1007/s10751-005-9111-6

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

The electric quadrupole coupling constants eqQ/h of Na-20 (I-pi=2(+), t(1/2)=449.7 ms) Na-21(I-pi=3/2, T-1/2=22.49 s) and Na-25 (I-pi=5/2, T-1/2=59.6 s) in single crystal ZnO and TiO2 were precisely measured by applying the beta-NMR technique. The ratio of the quadrupole moments between Na-20 (Na-25) and Na-21 was determined to be 0.728 +/- 0.023 (0.011 +/- 0.002).

DOI： 10.1007/s10751-005-9105-4

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

The g-factor of the exteremely proton-rich Al-23(T-1/2=0.47 s) has been measured for the first time, applying beta-NMR technique on this nucleus implanted in Si. The obtained vertical bar g vertical bar=(1.58 +/- 0.2) suggests that the spin of the ground state of Al-23 is 5/2. The magnetic moment is determined as vertical bar mu vertical bar = (3.95 +/- 0.55) mu(N).

DOI： 10.1007/s10751-005-9115-2

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD  

Nuclear magnetic resonance on oriented nuclei for (YFe)-Y-91 experiments have been performed. Comparing the external field dependence of resonance frequencies with (YFe)-Y-91 and (YFe)-Y-91m, the hyperfine anomaly in Fe was determined as (91m)Delta(91) = +4.2(8)%. The measured hyperfine anomaly was interpreted in terms of a microscopic theory including core polarization and meson exchange currents.

DOI： 10.1142/9789812702401_0045

Web of Science

researchmap

Language：English   Publisher：ELSEVIER SCIENCE BV  

DOI： 10.1016/j.nuclphysa.2003.08.020

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

Nuclear magnetic resonance on oriented nuclei was used in combination with beta-ray detection and ion implantation, leading to the successful observation of the resonance of (SrFe)-Sr-91. The magnetic hyperfine field (B-HF) was deduced as B-HF(SrFe)=-23.83(7) T using the known nuclear g factor. This result explains the existing problem of disagreement in B-HF values for SrFe between theory and experiment. An experimental nuclear spin-lattice relaxation rate was obtained and is briefly discussed in comparison with a theoretical estimate.

DOI： 10.1103/PhysRevB.68.012403

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：PHYSICAL SOC JAPAN  

Nuclear magnetic resonance on oriented nuclei (NMR-ON) of La existing as a dilute impurity in Fe was observed for the first time. NMR-ON experiments were performed by detecting the 1596 keV gamma rays from the beta decay of La-140 in external magnetic fields of 0.1, 0.1 0.4 and 0.6 T. From the external magnetic-field dependence of the resonance frequency. the magnetic hyperfine field and the Knight shift were deduced to be B-hf = -47 +/- 1 T and K = -4.0 +/- 3.4% respectively. The effective relaxation time of (LaFe)-La-140 at 8 mK in an external magnetic field of 0.2 T was determined to be 8.8 +/- 1.5 min using a single-exponential fit. The present value of the magnetic hyperfine field agrees with that deduced from a two-site model by the low-temperature nuclear orientation method.

DOI： 10.1143/JPSJ.72.723

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AMER INST PHYSICS  

One-nucleon removal reactions at relativistic energies have been used as spectroscopic tool to obtain information about the ground state properties of B-8 and O-23. Using the FRS at GSI, the longitudinal momentum distributions of the emerging fragments after breakup and the one-nucleon removal cross-sections were measured. The relative contributions of the remaining fragments (Be-7 and O-22) in their ground and excited states have been determined from measurements of gamma rays in coincidence with the longitudinal momentum distributions. In the B-8 case, the experimental breakup data on two different targets (C and Pb) allow a determination of the weight of the Be-7* component in the B-8 ground state wave function as (13.3+/-2.2) %. These results are discussed in the context of a theoretical three-body model. Preliminary results on O-23 indicate a spin and parity assignment of 1/2(+) in agreement with shell model predictions.

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE  

We observed deeply bound pi(-) Is states in Sn-115,Sn-119,Sn-123 for the first time in (116,120,124) Sn(d, He-3) reactions at recoil free conditions to determine the 1s binding energies and the widths precisely. A preliminary result is used to deduce the isovector scattering amplitude as b(1) = 0.115 +/- 0.005 m(pi)(-1). The observed enhancement of b(1) over the free piN value infers 35% reduction of f(pi)(2) at the normal nuclear density, rho = 0.17 fm(-3).

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Nuclear moments of several unstable nuclei with isospin T = 1/2 and 3/2, including exotic ones have been determined by the beta-NMR technique together with the polarized radioactive nuclear beams technique by the Osaka-RIKEN-HIMAC-LBL Collaboration. The results and their implications with respect to the nuclear structure of the unstable nuclei are discussed.

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

The magnetic moment of the short-lived beta emitter Ar-35 (I-pi = 3/2(+), T-1/2 = 1.77 s) has been remeasured by means of the combined technique of polarized nuclear beams and beta-NMR. The obtained magnetic moment is 0.6322(2) mu(N). This value is consistent with the old data, but is one order of more magnitude precise. The value is well reproduced by the shell model calculation. (C) 2002 Elsevier Science B.V. All rights reserved.

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMERICAN PHYSICAL SOC  

The nuclear magnetic moment of the Ce-143 ground state (T-1/2 = 33.0 h, I-pi = 3/2(-)) has been measured with the technique of nuclear magnetic resonance on oriented nuclei (NMR-ON) at low temperature. A sample ((CeFe)-Ce-143) was prepared by implanting into an Fe foil nuclei of mass number 143, which were separated from fission products with an on-line isotope separator. The NMR-ON spectra were obtained by detecting specific beta and gamma rays, and the resonance frequency was thereby determined to be 84.3(1) MHz. Using the reported value of the hyperfine magnetic field at other Ce nuclei in Fe, the nuclear magnetic moment of the Ce-143 ground state was determined to be \mu\ = 0.43(1) mu(N). This value is discussed based on a systematics of the magnetic moments of other N = 85 nuclei.

DOI： 10.1003/PhysRevC.65.017301

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE  

We observed the bound-state beta decay of fully ionized Tl-207 nuclei circulating in a storage ring. It is the first direct measurement of bound-state beta decay. Tl-207 nuclei were produced by the projectile fragmentation, separated by fragment separator and injected in the storage ring. Using the Schottky diagnostics the decay time spectrum of bare Tl-207 and hydrogen like Pb-207 ions which are the,daughter nuclei of bound-state beta decay were measured. Observed decay-rate ratio between bound-state and continuous-state beta decay was 0.18(2). This value is consistent with the theoretical calculation.

Web of Science

researchmap

Language：English   Publisher：AMER CHEMICAL SOC  

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Exotic nuclei produced via projectile fragmentation were separated in flight by the fragment separator FRS and injected into the storage ring ESR at (300-400) MeV/u. Ultra-cold fragment beams with half-lives larger than 10 s were investigated by Schottky Mass Spectroscopy (SMS) applying electron cooling. A new efficient data acquisition system recorded the time correlations allowing corrections for possible drifts of the revolution frequencies. In addition, it allows to observe the nuclear decay of the fragments circulating in the ESR. Representative results of previously unknown masses of about 150 neutron-deficient isotopes in the range of 52 less than or equal to Z less than or equal to 85 are discussed. Results for lead isotopes are compared with different mass models. Exotic nuclei with half-lives shorter than the time required for electron cooling have been investigated by time-of-flight measurements with the ESR being operated in the isochronous mode. This novel experimental technique gives access to all nuclei with half-lives down to the microsecond range and has been successfully applied in first experiments with light fragments produced by Cr-52 and Kr-84 projectiles. A mass resolving power of better than m/Deltam = 0.9 . 10(5) (FWHM) was achieved with isochronous mass spectrometry (IMS).

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：KLUWER ACADEMIC PUBL  

Low-temperature nuclear orientation (LTNO) experiments were performed on Pm-151 implanted into iron and Nd-147 implanted into nickel. The gamma-ray anisotropy measurements yielded values of the magnetic hyperfine field and the substitutional fractions of these ions in the host metals. An observed discrepancy between the substitutional fractions obtained from the 91 keV and 531 keV data on Nd-147 (Ni) under bar is briefly discussed.

DOI： 10.1023/A:1020583010083

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：KLUWER ACADEMIC PUBL  

A novel method for mass measurements of short-lived exotic nuclides is presented. Exotic nuclides were produced and separated in flight at relativistic energies: with the fragment separator (FRS) and were injected into the experimental storage ring (ESR). Operating the ESR in the isochronous mode we performed mass measurements of neutron deficient fragments of Kr-84 with half-lives larger than 50 ms. However, this experimental technique is applicable in a half-life range down to a few mus. A mass resolving power of 110000 (FWHM) has been achieved. Results are presented for the masses of As-68, Se-70,Se-71 and Br-73.

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：KLUWER ACADEMIC PUBL  

Brute-force nuclear magnetic resonance on oriented nuclei (BF-NMRON) of Nb-90, Mo-93m, Tc-96, and Rh-101m was carried out in a new host metal, Nb. The resonance center frequencies at an external field of 11.922(6) T were obtained as v((NbNb)-Nb-90) = 56.572(9) MHz, v((MoNb)-Mo-93m) = 85.76(3) MHz, v((TcNb)-Tc-96) = 66.997(11) MHz, and v(Rh-101m Nb) = 111.010(19) MHz. A systematic analysis of the Knight shift of 4d elements in extremely dilute alloy systems is briefly discussed.

DOI： 10.1023/A:1020535110992

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AKADEMIAI KIADO  

The fragment separator FRS at GSI was used as an energy-loss spectrometer to study the nuclear structure of exotic light nuclei via nucleon-removal reactions. The measurements performed include the longitudinal momentum distributions of fragments after one-nucleon removal, the one-nucleon removal cross-sections and in some cases the coincident detection of gamma rays emitted from the breakup fragments. The isotopes studied range from 5 < Z < 8.

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Reaction cross sections (sigma(R)) for B-8 on Be, C and Al targets were measured at energies of 40A and 60A MeV. The density distribution of B-8 was Studied through a chi(2)-fitting procedure on the sigma(R) including the high-energy data using the optical limit of Glauber theory with assumptions on the enhancement of the sigma(R) at low energies. The result shows a long tail in the density distribution. Large one-proton removal cross sections were also observed to support the existence of a long proton tail consistent with its binding energy. (C) 1999 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0375-9474(99)00308-5

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

The quadrupole moments of the short-lived, beta-emitting nuclei O-13 (I-pi = 3/2(-), T-1/2 = 8.6 ms), O-19 (I-pi = 5/2(+), T-1/2 = 27 s) and F-21 (I-pi = 5/2(+), T-1/2 = 4.3 s) were determined to be |Q(O-13)| = 11.0 +/- 1.3 mb, |Q(O-19)| = 3.7 +/- 0.4 mb and |Q(F-21)| = 110 +/- 22 mb by detecting their beta-NMR. The present results are compared with the theoretical values obtained by the Hartree Fock calculations taking their one nucleon-separation energies into account.

DOI： 10.1016/S0375-9474(00)88538-3

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

The degrees of nuclear spin polarization of B-8,B-12, C-9, N-12, O-13, F-20,F-21, Mg-23, Si-27 and Ca-39 produced in the high energy C-12,C-13, O-16, Ne-22, Mg-24, Si-28 and Ca-40 ions on Be collisions have been measured systematically, for the technical developments of the nuclear moment studies as well as the hyperfine interaction studies by means of beta-NMR technique. The fragment momentum dependences were well reproduced by the simple kinematical model. Incident energy dependence and the mass dependence as well as the reaction angle dependences were qualitatively explained by the mixing of the near and far side collisions.

DOI： 10.1023/A:1017000429243

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

The Knight shifts K for short-lived beta emitters N-12 and Si-27 implanted in Pt have been measured by means of beta-NMR technique. The results were K(N-12 in Pt) = +(5.8 +/- 2.1) X 10(-4) and K(Si-27 in Pt) = +(1.4 +/- 0.8) X 10(-3). The spin-lattice relaxation time T-1 was measured for N-12 in Pt. The result was T-1(N-12 in Pt, T = 300 K) = 66 +/- 8 ms, thus, T1T = 20 +/- 2 Ks. The present Knight shifts are in good agreement with the KKR band structure calculation with local lattice relaxation determined theoretically.

DOI： 10.1023/A:1017052413313

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

The electric quadrupole interaction of O-19(I-pi = (5/2)(+), T-1/2 = 27.0 s) in TiO2 single crystal was studied in detail by means of the beta-NQR to determine the electric quadrupole moments Q of short-lived beta-emitting nuclei O-19 and O-13(I-pi = (3/2)(-) T-1/2 = 8.6 ms). Two implantation sites were found for the implanted O nucleus and the quadrupole coupling constants of O-19 at these sites were determined. We observed FT-NMR of the enriched stable isotope O-17 in TiO2 and obtained the electric field gradient (EFG) at the oxygen substitutional site. With this knowledge, we have determined Q(O-13) = 11.0 +/- 1.3 mb and Q(O-19) = 3.7 +/- 0.4 mb. The present results are compared with the theoretical values calculated by the shell model code, OXBASH and by the Hartree-Fock calculation with the realistic potential.

DOI： 10.1023/A:1017031908770

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

The magnetic hyperfine splitting frequency of (BrNi)-Br-82 in an external magnetic field of 0.2 T has been measured by NMR-ON method at 8 mK. The centre of resonance frequency was determined to be 18.7(2) MHz. With the known g-factor of g(Br-82) = 0.3254(1), the hyperfine field of (BrNi)-Br-82 was deduced as B-hf((BrNi)-Br-82) = 7.34(8) T. The measured value is compared with the calculated value based on band structure using bonding states.

DOI： 10.1023/A:1017067105194

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

The beta-NMR spectra of F-21, Mg-23, Si-27 and Ca-39 which were produced in heavy ion collisions and implanted in various crystals have been observed. The magnetic moments of F-21 and Si-27 were determined to be \mu(F-21)\ = 3.9194 +/- 0.0012 mu(N) and \mu(Si-27)\ = 0.8653 +/- 0.0003 mu(N), respectively. The electric quadrupole coupling constants were determined for the first time to be \eqQ(F-21 in MgF2)/h\ = 9.94 +/- 0.09 MHz, \eqQ(Mg-23 in MgF2)/h\ = 1.96 +/- 0.06 MHz, \eqQ(Si-27 in Al2O3)/h\ = 1.90 +/- 0.12 MHz, \eqQ(Ca-39 in CaCO3)/h\ = 0.60 +/- 0.04 MHz. From the present eqQ/h, the Q moments were deduced as \Q(F-21)\ = 110 +/- 22 mb, \Q(Mg-23)\ = 114 +/- 3 mb, \Q(Si-27)\ = 60 +/- 13 mb and \Q(Ca-39)\ = 36 +/- 7 mb. The present data were compared with the theoretical values obtained by the OXBASH shell model code.

DOI： 10.1023/A:1017036009679

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BALTZER SCI PUBL BV  

The spin relaxation time T-1 for short-lived beta emitters O-13 and Mg-23 implanted in Pt have been measured for the first time; T1T(O-13) = 2.90 +/- 0.65 Ks and T1T( Mg) = 1665 +/- 140 Ks. The Knight shift for O-13 in Pt was measured at 300 K to be K(O-13) = +(4.23 +/- 0.14) x 10(-3). In the case of O-13, the Knight shift is unusually large and the relaxation time is unusually fast compared with other interstitial impurities in Pt. A KKR band-structure calculation reproduces the present large Knight shift fairly well.

DOI： 10.1007/BF02150192

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BALTZER SCI PUBL BV  

The magnetic moments of the proton drip-line nuclei O-13(I-pi = 3/2(-), T-1/2 = 8.6 ms) and C-9(I-pi = 3/2(-), T-1/2 126 ms) have been determined for the first time through the combined techniques of polarized radioactive nuclear beams and beta-NMR detection. The observed magnetic moments are \mu(O-13)\ = 1.3891 +/- 0.0003 mu(N) and \mu(C-9)\ = 1.3914 +/- 0.0005 mu(N). Spin expectation values (sigma) are deduced to be 0.76 and 1.44 for O-13 and C-9, respectively. While the (sigma) of O-13 is consistent with the systematics from isospin T = 1/2 mirror pairs, the (sigma) of C-9 is unusually large, even far larger than the single particle value, (sigma) = 1.

DOI： 10.1007/BF02150194

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：AIP PRESS  

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：EDITIONS FRONTIERES  

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BALTZER SCI PUBL BV  

Recent improvements in isotope separators can be utilized along with the availability of a wide range of nuclear species from the heavy-ion fragmentation process to study hyperfine interactions. We have measured the magnetic moments of mirror nuclei using this method at the Lawrence Berkeley Laboratory's Bevalac heavy-ion accelerator. We present the merits, applicability and limitations of the technique.

DOI： 10.1007/BF00567486

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BALTZER SCI PUBL BV  

The beta-NMR technique has been modified in order to detect efficiently the nuclear quadrupole effects in the NMR spectra. Beta-NMR is detected as a function of coupling frequency; all RFs that correspond to the coupling frequency were applied simultaneously.

DOI： 10.1007/BF00567497

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BALTZER SCI PUBL BV  

Hyperfine interactions of beta-emitting F-17 implanted in single crystals of NaF and CaF2 were studied. The nuclear magnetic moment of the I(pi) = 5/2+ state was determined with improved precision to be \mu(F-17; I(pi) = 5/2+, T1/2 = 64.5 s)\ = 4.72130 +/- 0.00025 mu(N).

DOI： 10.1007/BF00568124

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BALTZER SCI PUBL BV  

NMR on the beta emitter Ti-43 has been observed by use of the beta-NMR technique. From the observed NMR spectrum, the magnetic moment of Ti-43 was determined to be Absolute value of mu = 0.85 +/- 0.02 mu(N). The value is significantly quenched from the single particle value -1.91 mu(N), which shows a strong effect resulting from meson-exchange currents and configuration mixing.

DOI： 10.1007/BF00568126

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BALTZER SCI PUBL BV  

Hyperfine interactions of B-12(I(pi) = 1+, T1/2 = 21 ms) implanted in the substitutional site of B in BN (hexagonal) was studied by detecting beta-NMR. In order to measure the quadrupole coupling constant efficiently, we employed a newly developed quadrupole resonance technique (NNQR). The quadrupole moment of B-12 was determined to be \Q(B-12)\ = 13.21 +/- 0.26 mb.

DOI： 10.1007/BF00568137

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BALTZER SCI PUBL BV  

Quadrupole effects in NMR spectra of Li-8(I(pi) = 2+; T1/2 = 0.84 s) in LiIO3 and LiNbO3 single crystals have been detected by use of a modified beta-NMR. The coupling constants for both crystals are in agreement with known ones. Field gradients in the crystals were measured by detecting pulsed-Fourier transformed NMR of Li-7. The quadrupole moments deduced from both samples agree, and \Q(Li-8; 2+)\ = 32.7 +/- 0.6 mb has been determined.

DOI： 10.1007/BF00568132

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BALTZER SCI PUBL BV  

The magnetic moment of O-15(I(pi) = 1/2-, T1/2 = 122 s) has been measured precisely by use of the beta-NMR detection of O-15 in TiO2 as, \mu(O-15; 1/2-)\ = 0.71951(12) mu(N). The effective nucleon mass in the nuclei around mass number 16 was discussed using the isoscalar moment deduced in connection with the magnetic moment of N-15.

DOI： 10.1007/BF00568123

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BALTZER SCI PUBL BV  

The nuclear quadrupole moment of B-8(I(pi) = 2+, T1/2 = 769 ms) has been determined by use of a modified beta-NMR detection as \Q(B-8)\ = 68.3 +/- 2.1 mb. A field gradient was obtained in a single crystal Mg at room temperature.

DOI： 10.1007/BF00568134

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BALTZER SCI PUBL BV  

The magnetic moment of the Mg-23 (I(pi) = 3/2+, T1/2 = 11.3 s), has been determined as \mu(Mg-23)\ = 0.5364 +/- 0.0003 mu(N) by use of beta-NMR detection with the recoil polarization obtained through a low energy nuclear reaction.

DOI： 10.1007/BF00568125

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：EDITIONS FRONTIERES  

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BALTZER SCI PUBL BV  

Quadrupole effects in beta-NMR spectra of Sc-41(I(pi) = 7/2-, T1/2 = 0.596 s) implanted in a TiO2 single crystal were detected by use of a modified beta-NMR technique. Using the field gradient in the crystal determined by the pulsed-Fourier-transformed NMR of Sc-45 in TiO2, the quadrupole moment of Sc-41 has been determined as \Q(Sc-41; 7/2-)\ = 166 +/- 8 mb.

DOI： 10.1007/BF00568138

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BALTZER SCI PUBL BV  

The nuclear quadrupole moment of B-8(I(pi) = 2+, T1/2 = 769 ms) has been determined by use of a modified beta-NMR detection as \Q(B-8)\ = 68.3 +/- 2.1 mb, which is twice the prediction of the Cohen-Kurath shell model calculation. The anomalous quadrupole moment which is carried mainly by the protons in the nucleus, has been accounted for by the proton halo effect.

DOI： 10.1007/BF00568133

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：IOP PUBLISHING LTD  

NMR has been observed on beta-emitting Ti-43 produced in the 116 AMeV Ti-46 On C collision by means of asymmetric beta decay. The observed spin polarization of Ti-43 showed a reversed tendency in its momentum dependence compared with that observed for fragments produced in the Ca-40 on Au collision. This suggests negative angle deflection of Ti-43 due to the nuclear attractive potential. From the observed NMR spectrum, the magnetic moment of Ti-43 was determined to be \mu\=(0.85 +/- 0.02) mu(N). The value is significantly quenched from the single particle value -1.91 mu(N), which shows a strong effect due to meson exchange currents and configuration mixing.

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BALTZER SCI PUBL BV  

Spin polarization of Ti-43 produced through the projectile fragmentation process in Ti-46 on C collisions at 116 MeV/nucleon has been observed as a function of fragment momentum by means of beta-decay asymmetry. From the momentum dependence of the fragment polarization, it was concluded that negative angle deflection of the Ti-43 fragment due to the nuclear attractive potential is the main reaction path in the case of light targets.

DOI： 10.1007/BF00568127

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BALTZER SCI PUBL BV  

NMR spectra of B-12 in Pt (fcc) metal were observed by use of the beta-NMR detection method. A sharp single line was observed by use of an annealed Pt foil for the implantation medium. The dipolar broadening has been determined to be 332 +/- 30 Hz (HWHM).

DOI： 10.1007/BF00568171

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

The Beam 44 fragment separator was built at the Bevalac of LBL for NMR studies of beta emitting nuclei. K-37, Ca-39, and Ti-43 fragments originating from Ca-40 and Ti-46 primary beams were separated by the separator for NMR studies on these nuclei. Nuclear spin polarization was created in Ca-39 and Ti-43 using the tilted foil technique (TFT), and the magnetic moment of Ti-43 was deduced. Fragment polarization was measured for K-37 and Ca-39 emitted to finite deflection angles. The Beam 44 fragment separator in combination with a proper polarization technique, such as TFT or fragment polarization, has been very effective for such NMR studies.

DOI： 10.1016/0168-583X(92)95946-O

Web of Science

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ADAM HILGER LTD  

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BALTZER SCI PUBL BV  

DOI： 10.1007/BF02407632

Web of Science

researchmap

researchmap

DOI： 10.1016/S0375-9474(03)00671-7

researchmap

DOI： 10.1016/S0375-9474(03)00671-7

researchmap

DOI： 10.1016/S0375-9474(03)00822-4

researchmap

researchmap

Language：English   Publisher：PHYSICAL SOC JAPAN  

Brute-force nuclear magnetic resonance on oriented nuclei (BF-NMRON) was used to investigate the nuclear spin-relaxation times, T-1, of Nb-90 in Nb and Cu, Tc-96 in Nb, Rh-101m in Cu, and I Ag-101m in Ag with an external field of 11.922 T at about 10 mK. The observed relaxation times with known nuclear g-factors were used to estimate the converted relaxation rates, (T(1)Tg(n)(2))(-1), which were compared with those n obtained from NMR and other methods. From the comparison, it was found that (T-1 Tg(n)(2))(-1) of Nb-90 in Nb n and Ag-110m in Ag coincided with those of the bulk systems. (T-1 Tg(n)(2))(-1) of Nb-90 in CU Was about four times n larger than that of Nb bulk system. Both Tc-96 in Nb and Rh-101m in Cu produced (T(1)Tg(n)(2))(-1) values n consistent with previous studies.

DOI： 10.1143/JPSJ.71.1589

Web of Science

researchmap

Language：English   Publisher：PHYSICAL SOC JAPAN  

Brute-force nuclear magnetic resonance on oriented nuclei (BF-NMRON) was used to investigate the nuclear spin-relaxation times, T-1, of Nb-90 in Nb and Cu, Tc-96 in Nb, Rh-101m in Cu, and I Ag-101m in Ag with an external field of 11.922 T at about 10 mK. The observed relaxation times with known nuclear g-factors were used to estimate the converted relaxation rates, (T(1)Tg(n)(2))(-1), which were compared with those n obtained from NMR and other methods. From the comparison, it was found that (T-1 Tg(n)(2))(-1) of Nb-90 in Nb n and Ag-110m in Ag coincided with those of the bulk systems. (T-1 Tg(n)(2))(-1) of Nb-90 in CU Was about four times n larger than that of Nb bulk system. Both Tc-96 in Nb and Rh-101m in Cu produced (T(1)Tg(n)(2))(-1) values n consistent with previous studies.

DOI： 10.1143/JPSJ.71.1589

Web of Science

researchmap

DOI： 10.1143/JPSJ.71.1589

researchmap

researchmap

researchmap

researchmap

DOI： 10.1016/S0370-2693(02)01245-5

researchmap

DOI： 10.1016/S0370-2693(02)01245-5

researchmap

DOI： 10.1016/S0375-9474(02)01071-0

researchmap

DOI： 10.1016/S0375-9474(02)01071-0

researchmap

researchmap

researchmap

DOI： 10.1143/JPSJ.71.1589

researchmap

researchmap

researchmap

DOI： 10.1023/A:1012269720057

researchmap

researchmap

Language：English  

Brute-force nuclear magnetic resonance on oriented nuclei (BF-NMRON) experiments have been performed for 90NbCu, 101mRhCu and 110mAgAg at about 10 mK. Narrow resonance spectra were detected. Using the known values of the g-factors, the Knight shift has been deduced: K(90NbCu) = 0.62(24) %, K(101mRhCu) = 0.87(27)%. The effective spin-lattice relaxation times were also measured.

DOI： 10.1023/A:1012213519149

Scopus

researchmap

DOI： 10.1023/A:1012269720057

researchmap

researchmap

researchmap

DOI： 10.1023/A:1011911720453

researchmap

DOI： 10.1023/A:1011911720453

researchmap

Language：English   Publisher：KLUWER ACADEMIC PUBL  

Brute-force nuclear magnetic resonance on oriented nuclei (BF-NMRON) of Nb-90, Mo-93m, Tc-96, and Rh-101m was carried out in a new host metal, Nb. The resonance center frequencies at an external field of 11.922(6) T were obtained as v((NbNb)-Nb-90) = 56.572(9) MHz, v((MoNb)-Mo-93m) = 85.76(3) MHz, v((TcNb)-Tc-96) = 66.997(11) MHz, and v(Rh-101m Nb) = 111.010(19) MHz. A systematic analysis of the Knight shift of 4d elements in extremely dilute alloy systems is briefly discussed.

Web of Science

researchmap

Language：English  

Brute-force nuclear magnetic resonance on oriented nuclei (BF-NMRON) experiments have been performed for 90NbCu, 101mRhCu and 110mAgAg at about 10 mK. Narrow resonance spectra were detected. Using the known values of the g-factors, the Knight shift has been deduced: K(90NbCu) = 0.62(24) %, K(101mRhCu) = 0.87(27)%. The effective spin-lattice relaxation times were also measured.

DOI： 10.1023/A:1012213519149

Scopus

researchmap

researchmap

DOI： 10.1023/A:1017040110587

researchmap

DOI： 10.1023/A:1017044211496

researchmap

DOI： 10.1023/A:1017044211496

researchmap

DOI： 10.1103/PhysRevC.59.669

researchmap

DOI： 10.1103/PhysRevC.59.669

researchmap

DOI： 10.1016/S0370-2693(99)00620-6

researchmap

DOI： 10.1016/S0370-2693(99)00620-6

researchmap

researchmap

researchmap

researchmap

researchmap

DOI： 10.1023/A:1017040110587

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

DOI： 10.1016/S0370-2693(97)01553-0

researchmap

DOI： 10.1016/S0370-2693(97)01553-0

researchmap

Language：English   Publisher：AMERICAN PHYSICAL SOC  

Nuclear magnetic resonance on oriented nuclei (NMR-ON) measurements were performed on the successive decays of Zr-89-Y-89(m) and Os-191-Ir-191(m) in Fe. The NMR-ON spectra of (ZrFe)-Zr-89 and (OsFe)-Os-191 were obtained by detecting gamma rays from the decay of the isomers, Y-89(m) and Ir-191(m), respectively. For (ZrFe)-Zr-89, the anisotropy of the gamma ray increased at the resonance. On the other hand, for (OsFe)-Os-191 the anisotropy of the gamma ray decreased at the resonance. These phenomena were explained using the spin inversion and spin noninversion processes including the lifetimes of the isomers and spin lattice relaxation times. NMR-ON measurements for such spin inversion and noninversion processes were reported. The resonance spectra were also observed by detecting beta rays from Zr-89 and Os-191. In these experiments the magnetic moments of Zr-89 and Os-191 were determined to be -1.08 (2) mu(N) and 0.962 (28) mu(N), respectively. The signs of the magnetic moments of Y-89(m) and Ir-191(m) were also determined to be positive.

DOI： 10.1103/PhysRevC.54.1129

Web of Science

PubMed

CiNii Article

researchmap

researchmap

researchmap

DOI： 10.1103/PhysRevC.54.554

PubMed

researchmap

researchmap

DOI： 10.1103/PhysRevC.54.554

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

DOI： 10.1016/0370-2693(93)90219-8

researchmap

DOI： 10.1016/0370-2693(93)90219-8

researchmap

DOI： 10.1016/0375-9474(93)90189-5

researchmap

DOI： 10.1016/0375-9474(93)90189-5

researchmap

researchmap

Language：English   Publisher：SPRINGER  

Hyperfine interactions of beta-emitting F-17 implanted in single crystals of NaF and CaF2 were studied. The nuclear magnetic moment of the I(pi) = 5/2+ state was determined with an improved precision to be \mu(F-17; I(pi) = 5/2+, T1/2 = 64.5 s\ = 4.72130 +/- 0.00025 nm. Isoscalar magnetic moments of die doubly closed shell +/- 1 nucleon nuclei around mass number 16 were derived and the effective nucleon mass in the nucleus was discussed.

Web of Science

researchmap

researchmap

DOI： 10.1103/PhysRevLett.69.2058

researchmap

DOI： 10.1103/PhysRevLett.69.2058

researchmap

researchmap

researchmap

researchmap

researchmap

researchmap

DOI： 10.1016/0375-9474(90)90314-C

researchmap

researchmap

researchmap

researchmap

researchmap

DOI： 10.1016/0375-9474(90)90314-C

researchmap

researchmap

researchmap

researchmap