2021/10/20 更新

写真a

マツオ マサユキ
松尾 正之
MATSUO Masayuki
所属
教育研究院 自然科学系 数理物質科学系列 教授
自然科学研究科 数理物質科学専攻 教授
理学部 理学科 教授
職名
教授
外部リンク

学位

  • 理学博士 ( 1987年3月   京都大学 )

研究キーワード

  • 原子核理論

  • NUCLEAR THEORY

研究分野

  • 自然科学一般 / 素粒子、原子核、宇宙線、宇宙物理にする理論

経歴

  • 新潟大学   理学部 理学科   教授

    2017年4月 - 現在

  • 新潟大学   自然科学研究科 数理物質科学専攻   教授

    2010年4月 - 現在

  • 新潟大学   自然科学研究科 数理物質科学専攻   教授

    2010年4月 - 現在

  • 新潟大学   物理学科   教授

    2005年2月 - 2017年3月

  • 新潟大学   物理学科   助教授

    2000年3月 - 2005年1月

学歴

  • 京都大学

    - 1987年

      詳細を見る

  • 京都大学   理学研究科   物理学第二

    - 1987年

      詳細を見る

    国名: 日本国

    researchmap

  • 京都大学   理学部   物理学

    - 1982年

      詳細を見る

    国名: 日本国

    researchmap

  • 京都大学

    - 1982年

      詳細を見る

所属学協会

 

論文

  • Anderson-Bogoliubov phonons in the inner crust of neutron stars: Dipole excitation in a spherical Wigner-Seitz cell 査読

    Tsunenori Inakura, Masayuki Matsuo

    PHYSICAL REVIEW C   96 ( 2 )   2017年8月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    Background: The Anderson-Bogoliubov (AB) phonon, called also the superfluid phonon, has attracted attentions since it may influence the thermal conductivity and other properties of the inner crust of neutron stars. However, there are a limited number of microscopic studies of the AB phonon where the presence of clusters is explicitly taken into account.
    Purpose: We intend to clarify how the presence of clusters affects the AB phonon in order to obtain microscopic information relevant to the coupling between the AB phonon and the lattice phonon.
    Methods: The Hartree-Fock-Bogoliubov model and the quasiparticle random-phase approximation formulated in a spherical Wigner-Seitz cell are adopted to describe neutron superfluidity and associated collective excitations. We perform systematic numerical calculations for dipole excitation by varying the neutron chemical potential and the number of protons in a cell.
    Results: The model predicts systematic emergence of the dipole AB phonon mode, which, however, exhibits strong suppression of phonon amplitude inside the cluster. We find also that the phonon amplitude around the cluster surface varies with the neutron density. At higher neutron densities (>= 0.006 fm(-3)) the AB phonon mode exhibits behavior similar to the pygmy dipole resonance in neutron-rich nuclei.
    Conclusions: The dipole AB phonon mode does not penetrate into the clusters. This suggests that the coupling between the AB phonon and the lattice phonon may be weak.

    DOI: 10.1103/PhysRevC.96.025806

    Web of Science

    researchmap

  • Time-dependent density-functional description of nuclear dynamics 査読

    Takashi Nakatsukasa, Kenichi Matsuyanagi, Masayuki Matsuo, Kazuhiro Yabana

    REVIEWS OF MODERN PHYSICS   88 ( 4 )   2016年11月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    The basic concepts and recent developments in the time-dependent density-functional theory (TDDFT) for describing nuclear dynamics at low energy are presented. The symmetry breaking is inherent in nuclear energy density functionals, which provides a practical description of important correlations at the ground state. Properties of elementary modes of excitation are strongly influenced by the symmetry breaking and can be studied with TDDFT. In particular, a number of recent developments in the linear response calculation have demonstrated their usefulness in the description of collective modes of excitation in nuclei. Unrestricted real-time calculations have also become available in recent years, with new developments for quantitative description of nuclear collision phenomena. There are, however, limitations in the real-time approach; for instance, it cannot describe the many-body quantum tunneling. Thus, the quantum fluctuations associated with slow collective motions are explicitly treated assuming that time evolution of densities is determined by a few collective coordinates and momenta. The concept of collective submanifold is introduced in the phase space associated with the TDDFT and used to quantize the collective dynamics. Selected applications are presented to demonstrate the usefulness and quality of the new approaches. Finally, conceptual differences between nuclear and electronic TDDFT are discussed, with some recent applications to studies of electron dynamics in the linear response and under a strong laser field.

    DOI: 10.1103/RevModPhys.88.045004

    Web of Science

    researchmap

  • Microscopic derivation of the Bohr-Mottelson collective Hamiltonian and its application to quadrupole shape dynamics 査読

    Kenichi Matsuyanagi, Masayuki Matsuo, Takashi Nakatsukasa, Kenichi Yoshida, Nobuo Hinohara, Koichi Sato

    PHYSICA SCRIPTA   91 ( 6 )   2016年6月

     詳細を見る

    記述言語:英語   出版者・発行元:IOP PUBLISHING LTD  

    We discuss the nature of the low-frequency quadrupole vibrations from small-amplitude to large-amplitude regimes. We consider full five-dimensional quadrupole dynamics including three-dimensional rotations restoring the broken symmetries as well as axially symmetric and asymmetric shape fluctuations. Assuming that the time evolution of the self-consistent mean field is determined by five pairs of collective coordinates and collective momenta, we microscopically derive the collective Hamiltonian of Bohr and Mottelson, which describes low-frequency quadrupole dynamics. We show that the five-dimensional collective Schrodinger equation is capable of describing large-amplitude quadrupole shape dynamics seen as shape coexistence/mixing phenomena. We summarize the modern concepts of microscopic theory of large-amplitude collective motion, which is underlying the microscopic derivation of the Bohr-Mottelson collective Hamiltonian.

    DOI: 10.1088/0031-8949/91/6/063014

    Web of Science

    researchmap

  • Microscopic derivation of the quadrupole collective Hamiltonian for shape coexistence/mixing dynamics 査読

    Kenichi Matsuyanagi, Masayuki Matsuo, Takashi Nakatsukasa, Kenichi Yoshida, Nobuo Hinohara, Koichi Sato

    JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS   43 ( 2 )   2016年2月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    Assuming that the time-evolution of the self-consistent mean field is determined by five pairs of collective coordinate and collective momentum, we microscopically derive the collective Hamiltonian for low-frequency quadrupole modes of excitation. We show that the five-dimensional collective Schrodinger equation is capable of describing large-amplitude quadrupole shape dynamics seen as shape coexistence/mixing phenomena. We focus on basic ideas and recent advances of the approaches based on the time-dependent mean-field theory, but relations to other time-independent approaches are also briefly discussed.

    DOI: 10.1088/0954-3899/43/2/024006

    Web of Science

    researchmap

  • Effects of pairing correlation on the low-lying quasiparticle resonance in neutron drip-line nuclei 査読

    Yoshihiko Kobayashi, Masayuki Matsuo

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   ( 1 )   2016年1月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:OXFORD UNIV PRESS INC  

    We discuss the effects of pairing correlation on quasiparticle resonance. We analyze in detail how the width of the low-lying (Ex less than or similar to 1 MeV) quasiparticle resonance is governed by the pairing correlation in the neutron drip-line nuclei. We consider the Si-46 + n system to discuss the low-lying p-wave quasiparticle resonance. Solving the Hartree-Fock-Bogoliubov equation in coordinate space with the scattering boundary condition, we calculate the phase shift, the elastic cross section, the resonance width, and the resonance energy. We find that the pairing correlation has the effect of reducing the width of the quasiparticle resonance that originates from a particle-like orbit in weakly bound nuclei.

    DOI: 10.1093/ptep/ptv175

    Web of Science

    researchmap

  • Continuum quasiparticle random-phase approximation for astrophysical direct neutron capture reactions on neutron-rich nuclei 査読

    Masayuki Matsuo

    PHYSICAL REVIEW C   91 ( 3 )   2015年3月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    I formulate a many-body theory to calculate the cross section of direct radiative neutron capture reaction by means of the Hartree-Fock-Bogoliubov mean-field model and the continuum quasiparticle random-phase approximation (QRPA). A focus is put on very-neutron-rich nuclei and low-energy neutron kinetic energy in the range from 1 keV to several MeV, which is relevant to the rapid neutron capture process of nucleosynthesis. I begin with the photoabsorption cross section and the E1 strength function. Next, in order to apply the reciprocity theorem, I decompose the cross section into partial cross sections corresponding to different channels of one-and two-neutron emission decays of photo-excited states. A numerical example is shown for the photo-absorption of Sn-142 and the neutron capture of Sn-141.

    DOI: 10.1103/PhysRevC.91.034604

    Web of Science

    researchmap

  • Quadrupole shape dynamics from the viewpoint of a theory of large-amplitude collective motion 査読

    M. Matsuo, N. Hinohara, K. Sato, K. Matsuyanagi, T. Nakatsukasa, K. Yoshida

    PHYSICA SCRIPTA   89 ( 5 )   2014年5月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    Low-lying quadrupole shape dynamics is a typical manifestation of large-amplitude collective motion in finite nuclei. To describe the dynamics on a microscopic foundation, we have formulated a consistent scheme in which the Bohr collective Hamiltonian for the five-dimensional quadrupole shape variables is derived on the basis of the time-dependent Hartree-Fock-Bogoliubov theory. It enables us to incorporate the Thouless-Valatin effect on the shape inertial functions, which has been neglected in previous microscopic Bohr Hamiltonian approaches. Quantitative successes are illustrated for the low-lying spectra in Se-68, Mg30-34 and Cr58-64, which display shape-coexistence, shape-mixing and shape-transitional behavior.

    DOI: 10.1088/0031-8949/89/5/054020

    Web of Science

    researchmap

  • Di-neutron correlation in monopole two-neutron transfer modes in the Sn isotope chain 査読

    Hirotaka Shimoyama, Masayuki Matsuo

    PHYSICAL REVIEW C   88 ( 5 )   2013年11月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    We study microscopic structures of monopole pair vibrational modes and associated two-neutron transfer amplitudes in neutron-rich Sn isotopes by means of the linear response formalism of the quasiparticle random phase approximation (QRPA). For this purpose we introduce a method to decompose the transfer amplitudes with respect to two-quasiparticle components of the QRPA eigenmode. It is found that pair-addition vibrational modes in neutron-rich Sn132-140 and the pair rotational modes in Sn142-150 are commonly characterized by coherent contribution of quasaiparticle states having high orbital angular momenta l greater than or similar to 5, which suggests transfer of a spatially correlated neutron pair. The calculation also predicts a high-lying pair vibration, the giant pair vibration, emerging near the one-neutron separation energy in Sn110-130, and we find that they have the same di-neutron characters as that of the low-lying pair vibration in Sn132-140.

    DOI: 10.1103/PhysRevC.88.054308

    Web of Science

    researchmap

  • Continuum dipole response near the threshold and the direct neutron capture cross section at astrophysical energies 査読

    Masayuki Matsuo

    INTERNATIONAL SYMPOSIUM ON EXOTIC NUCLEAR STRUCTURE FROM NUCLEONS (ENSFN 2012)   445   2013年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    We apply the continuum quasiparticle random phase approximation to calculate the direct neutron capture cross section relevant to the r-process nucleo-synthesis. The electric dipole strength function in an even-even n-rich nucleus is decomposed with respect to the channels of direct neutron decays. Using the detailed balance relation, the partial dipole strengths are converted to obtain the direct neutron-capture cross sections. Numerical examples are given for Sn-142.

    DOI: 10.1088/1742-6596/445/1/012019

    Web of Science

    researchmap

  • Shape transition and fluctuations in neutron-rich Cr isotopes around N=40 査読

    Koichi Sato, Nobuo Hinohara, Kenichi Yoshida, Takashi Nakatsukasa, Masayuki Matsuo, Kenichi Matsuyanagi

    PHYSICAL REVIEW C   86 ( 2 )   2012年8月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    The spherical-to-prolate shape transition in neutron-rich Cr isotopes from N = 34 to 42 is studied by solving the collective Schrodinger equation for the five-dimensional quadrupole collective Hamiltonian. The collective potential and inertial functions are microscopically derived with use of the constrained Hartree-Fock-Bogoliubov plus local quasiparticle random-phase approximation method. Nature of the quadrupole collectivity of low-lying states is discussed by evaluating excitation spectra and electric quadrupole moments and transition strengths. The result of calculation indicates that Cr isotopes around Cr-64 are prolately deformed but still possess transitional character; large-amplitude shape fluctuations dominate in their low-lying states.

    DOI: 10.1103/PhysRevC.86.024316

    Web of Science

    researchmap

  • Microscopic Analysis of Shape Coexistence/Mixing and Shape Phase Transition in Neutron-Rich Nuclei around Mg-32 査読

    Nobuo Hinohara, Koichi Sato, Kenichi Yoshida, Takashi Nakatsukasa, Masayuki Matsuo, Kenichi Matsuyanagi

    PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT   ( 196 )   328 - 333   2012年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE  

    We have analyzed large-amplitude quadrupole collective dynamics in neutron-rich nuclei Mg30-36 using the five-dimensional quadrupole collective Hamiltonian approach. The collective Hamiltonian is microscopically derived with the constrained HFB plus local quasi-particle RPA method. Enhancement of the quadrupole collectivity from Mg-30 to Mg-34 is well described by the calculation. The shape transitional behavior in the ground band and the shape coexistence/mixing properties in the ground and excited 0(+) states are analyzed.

    Web of Science

    researchmap

  • Microscopic approach to large-amplitude deformation dynamics with local QRPA inertial masses 査読

    Koichi Sato, Nobuo Hinohara, Takashi Nakatsukasa, Masayuki Matsuo, Kenichi Matsuyanagi

    RUTHERFORD CENTENNIAL CONFERENCE ON NUCLEAR PHYSICS, 2011   381   2012年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    We have developed a new method for determining microscopically the five-dimensional quadrupole collective Hamiltonian, on the basis of the adiabatic self-consistent collective coordinate method. This method consists of the constrained Hartree-Fock-Bogoliubov (HFB) equation and the local QRPA (LQRPA) equations, which are an extension of the usual QRPA (quasiparticle random phase approximation) to non-HFB-equilibrium points, on top of the CHFB states. One of the advantages of our method is that the inertial functions calculated with this method contain the contributions of the time-odd components of the mean field, which are ignored in the widely-used cranking formula. We illustrate usefulness of our method by applying to oblate-prolate shape coexistence in Kr-72 and shape phase transition in neutron-rich Cr isotopes around N = 40.

    DOI: 10.1088/1742-6596/381/1/012103

    Web of Science

    researchmap

  • Shape fluctuations in the ground and excited 0(+) states of Mg-30,Mg-32,Mg-34 査読

    Nobuo Hinohara, Koichi Sato, Kenichi Yoshida, Takashi Nakatsukasa, Masayuki Matsuo, Kenichi Matsuyanagi

    PHYSICAL REVIEW C   84 ( 6 )   2011年12月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    Large-amplitude collective dynamics of shape phase transition in the low-lying states of Mg30-36 is investigated by solving the five-dimensional (5D) quadrupole collective Schrodinger equation. The collective masses and potentials of the 5D collective Hamiltonian are microscopically derived with use of the constrained Hartree-Fock-Bogoliubov plus local quasiparticle random phase approximation method. Good agreement with the recent experimental data is obtained for the excited 0(+) states as well as the ground bands. For Mg-30, the shape coexistence picture that the deformed excited 0(+) state coexists with the spherical ground state approximately holds. On the other hand, large-amplitude quadrupole-shaped fluctuations dominate in both the ground and the excited 0(+) states in Mg-32, providing a picture that is different from the interpretation of the "coexisting spherical excited 0(+) state" based on the naive inversion picture of the spherical and deformed configurations.

    DOI: 10.1103/PhysRevC.84.061302

    Web of Science

    researchmap

  • Anomalous pairing vibration in neutron-rich Sn isotopes beyond the N=82 magic number 査読

    Shimoyama Hirotaka, Matsuo Masayuki

    PHYSICAL REVIEW C   84 ( 4 )   2011年10月

  • Persistent contribution of unbound quasiparticles to the pair correlation in the continuum Skyrme-Hartree-Fock-Bogoliubov approach 査読

    Zhang Y, Matsuo M, Meng J

    PHYSICAL REVIEW C   83 ( 5 )   2011年5月

  • LOCAL QRPA VIBRATIONAL AND ROTATIONAL INERTIAL FUNCTIONS FOR LARGE-AMPLITUDE QUADRUPOLE COLLECTIVE DYNAMICS 査読

    N. Hinohara, K. Sato, T. Nakatsukasa, M. Matsuo

    ACTA PHYSICA POLONICA B   42 ( 3-4 )   443 - 446   2011年3月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:POLISH ACAD SCIENCES INST PHYSICS  

    A new microscopic approach is proposed to derive the five-dimensional quadrupole collective Hamiltonian. It is based on the time-dependent mean-field theory and the adiabatic self-consistent collective coordinate method. We apply the method to studies of oblate-prolate shape coexistence/mixing phenomena and anharmonic vibrations. Experimental data for Se isotopes are well reproduced.

    DOI: 10.5506/APhysPolB.42.443

    Web of Science

    researchmap

  • Microscopic description of large-amplitude shape-mixing dynamics with local QRPA inertial functions 査読

    Nobuo Hinohara, Koichi Sato, Kenichi Yoshida, Takashi Nakatsukasa, Masayuki Matsuo

    INTERNATIONAL SYMPOSIUM ON NEW FACES OF ATOMIC NUCLEI: FESTSCHRIFT IN HONOUR OF AKITO ARIMA'S 80TH BIRTHDAY   1355   2011年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    We introduce a microscopic approach to derive all the inertial functions in the five-dimensional quadrupole collective Hamiltonian. Local normal modes are evaluated on the constrained mean field in the quasiparticle random-phase approximation in order to derive the inertial functions. The collective Hamiltonians for neutron-rich Mg isotopes are determined with use of this approach, and the shape coexistence/mixing around the N = 20 region is analyzed.

    DOI: 10.1063/1.3584067

    Web of Science

    researchmap

  • Microscopic description of large-amplitude shape-mixing dynamics with inertial functions derived in local quasiparticle random-phase approximation 査読

    Nobuo Hinohara, Koichi Sato, Takashi Nakatsukasa, Masayuki Matsuo, Kenichi Matsuyanagi

    PHYSICAL REVIEW C   82 ( 6 )   2010年12月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    On the basis of the adiabatic self-consistent collective coordinate method, we develop an efficient microscopic method of deriving the five-dimensional quadrupole collective Hamiltonian and illustrate its usefulness by applying it to the oblate-prolate shape coexistence/mixing phenomena in proton-rich (68,70,72)Se. In this method, the vibrational and rotational collective masses (inertial functions) are determined by local normal modes built on constrained Hartree-Fock-Bogoliubov states. Numerical calculations are carried out using the pairing-plus-quadrupole Hamiltonian including the quadrupole-pairing interaction within the two major-shell active model spaces both for neutrons and protons. It is shown that the time-odd components of the moving mean-field significantly increase the vibrational and rotational collective masses in comparison with the Inglis-Belyaev cranking masses. Solving the collective Schrodinger equation, we evaluate excitation spectra, quadrupole transitions, and moments. The results of the numerical calculation are in excellent agreement with recent experimental data and indicate that the low-lying states of these nuclei are characterized as an intermediate situation between the oblate-prolate shape coexistence and the so-called gamma unstable situation where large-amplitude triaxial-shape fluctuations play a dominant role.

    DOI: 10.1103/PhysRevC.82.064313

    Web of Science

    researchmap

  • Surface-enhanced pair transfer amplitude in quadrupole states of neutron-rich Sn isotopes 査読

    Matsuo Masayuki, Serizawa Yasuyoshi

    PHYSICAL REVIEW C   82 ( 2 )   2010年8月

  • MICROSCOPIC APPROACH TO ADIABATIC LARGE-AMPLITUDE QUADRUPOLE COLLECTIVE DYNAMICS IN Se ISOTOPES 査読

    Nobuo Hinohara, Koichi Sato, Takashi Nakatsukasa, Masayuki Matsuo

    MODERN PHYSICS LETTERS A   25 ( 21-23 )   1796 - 1799   2010年7月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WORLD SCIENTIFIC PUBL CO PTE LTD  

    We develop an efficient microscopic method of deriving the five-dimensional quadrupole collective Hamiltonian on the basis of the adiabatic self-consistent collective coordinate method. We illustrate its usefulness by applying it to the oblate-prolate shape coexistence/mixing phenomena and anharmonic vibrations in Se isotopes.

    DOI: 10.1142/S0217732310000356

    Web of Science

    researchmap

  • PHENOMENOLOGICAL ANALYSIS OF THE OBLATE-PROLATE SYMMETRY BREAKING IN TRIAXIAL DEFORMATION DYNAMICS 査読

    Koichi Sato, Nobuo Hinohara, Takashi Nakatsukasa, Masayuki Matsuo

    MODERN PHYSICS LETTERS A   25 ( 21-23 )   2018 - 2019   2010年7月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WORLD SCIENTIFIC PUBL CO PTE LTD  

    From a viewpoint of oblate-prolate symmetry and its breaking, we propose a simple model based on the quadrupole collective Hamiltonian to study dynamics of triaxial deformation in shape coexistence phenomena. The numerical results suggest that the oblate-prolate symmetry breaking in the rotational moments of inertia can play an important role for the oblate-prolate shape coexistence as well as that in the collective potential.

    DOI: 10.1142/S0217732310000939

    Web of Science

    researchmap

  • MICROSCOPIC ANALYSIS OF SHAPE MIXING IN LOW-LYING STATES OF PROTON-RICH Kr ISOTOPES 査読

    Koichi Sato, Nobuo Hinohara, Takashi Nakatsukasa, Masayuki Matsuo

    MODERN PHYSICS LETTERS A   25 ( 21-23 )   2020 - 2021   2010年7月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WORLD SCIENTIFIC PUBL CO PTE LTD  

    We develop a method of determining microscopically the collective potential and inertial masses in the five-dimensional quadrupole collective Hamiltonian on the basis of the adiabatic self-consistent collective coordinate method. We apply this method to shape coexistence/mixing phenomena in low-lying states of the proton-rich Kr isotopes.

    DOI: 10.1142/S0217732310000940

    Web of Science

    researchmap

  • PAIR VIBRATION 0(+) STATE IN NEUTRON-RICH Sn ISOTOPE: CONTINUUM QRPA ANALYSIS OF NEUTRON PAIR TRANSFER STRENGTH 査読

    Hirotaka Shimoyama, Masayuki Matsuo

    MODERN PHYSICS LETTERS A   25 ( 21-23 )   2024 - 2025   2010年7月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WORLD SCIENTIFIC PUBL CO PTE LTD  

    We discuss the pair transfer mode populating pair vibration 0(2)(+) state in neutron-rich Sn isotopes by means of the continuum quasi particle random phase approximation (continuum QRPA). It is seen that the strength of the two-neutron addition transfer from the ground state to the 0(2)(+) state is significantly enhanced beyond the N = 82 shell gap.

    DOI: 10.1142/S0217732310000964

    Web of Science

    researchmap

  • Open problems in the microscopic theory of large-amplitude collective motion 査読

    K. Matsuyanagi, M. Matsuo, T. Nakatsukasa, N. Hinohara, K. Sato

    JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS   37 ( 6 )   2010年6月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    Construction of the microscopic theory of large-amplitude collective motion, capable of describing a wide variety of quantum collective phenomena in nuclei, is a long-standing and fundamental subject in the study of nuclear many-body systems. The present status of the challenge toward this goal is discussed taking the shape coexistence/mixing phenomena as typical manifestations of the large-amplitude collective motion at zero temperature. Some open problems in rapidly rotating cold nuclei are also briefly discussed in this connection.

    DOI: 10.1088/0954-3899/37/6/064018

    Web of Science

    researchmap

  • Open problems in nuclear structure near drip lines 査読

    Masayuki Matsuo, Takashi Nakatsukasa

    JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS   37 ( 6 )   2010年6月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    Physics related to weakly bound nuclei and low-density asymmetric nuclear matter is discussed from a theoretical point of view. Especially, we focus our discussion on new correlations in nuclei near the drip lines and on open issues of the density functional theory with a proper account of the continuum.

    DOI: 10.1088/0954-3899/37/6/064017

    Web of Science

    researchmap

  • A Model Analysis of Triaxial Deformation Dynamics in Oblate-Prolate Shape Coexistence Phenomena 査読

    Koichi Sato, Nobuo Hinohara, Takashi Nakatsukasa, Masayuki Matsuo, Kenichi Matsuyanagi

    PROGRESS OF THEORETICAL PHYSICS   123 ( 1 )   129 - 155   2010年1月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE  

    From the viewpoint of oblate-prolate symmetry and its breaking, we adopt the quadrupole collective Hamiltonian to study the dynamics of triaxial deformation in shape coexistence phenomena. It accommodates the axially symmetric rotor model, the gamma-unstable model, the rigid triaxial rotor model, and an ideal situation for the oblate-prolate shape coexistence as particular cases. Numerical solutions of this model yield a number of interesting suggestions. (1) The relative energy of the excited 0(+) state can be a signature of the potential shape along the gamma direction. (2) Specific E2 transition probabilities are sensitive to the breaking of the oblate-prolate symmetry. (3) Nuclear rotation may induce the localization of collective wave functions in the (beta, gamma) deformation space.

    DOI: 10.1143/PTP.123.129

    Web of Science

    researchmap

  • Large-amplitude quadrupole collective dynamics of shape coexistence phenomena in proton-rich Se and Kr isotopes 査読

    Nobuo Hinohara, Koichi Sato, Takashi Nakatsukasa, Masayuki Matsuo

    TOURS SYMPOSIUM ON NUCLEAR PHYSICS AND ASTROPHYSICS - VII   1238   286 - +   2010年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    The five-dimensional quadrupole collective Hamiltonian for large-amplitude collective dynamics is microscopically constructed by the constrained Hartree-Fock-Bogoliubov (CHFB) method and local quasiparticle random phase approximation (LQRPA). The excitation spectra and the electric quadrupole transitions between the low-lying states in Se-68 are calculated by solving the collective Schrodinger equation.

    DOI: 10.1063/1.3455952

    Web of Science

    researchmap

  • Microscopic derivation of five-dimensional collective Hamiltonian of large-amplitude quadrupole motion: application to shape coexistence in proton-rich Se isotopes 査読

    Nobuo Hinohara, Koichi Sato, Takashi Nakatsukasa, Masayuki Matsuo

    NUCLEAR PHYSICS TRENDS   1235   96 - +   2010年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    We present a new microscopic approach which consists of the constrained Hartree-Fock-Bogoliubov (CHFB) and the local quasiparticle random-phase approximation (LQRPA) to construct the five-dimensional quadrupole collective Hamiltonian for large-amplitude collective dynamics. The excitation spectra and the electric quadrupole transitions between the low-lying states in Se-68 are calculated by solving the collective Schrodinger equation.

    DOI: 10.1063/1.3442638

    Web of Science

    researchmap

  • Pair correlations and pair transfers in neutron-rich nuclei 査読

    Masayuki Matsuo, Hirotaka Shimoyama, Hiroshi Oba

    NUCLEAR PHYSICS TRENDS   1235   9 - +   2010年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Features of the neutron pair correlation characteristic to neutron-rich nuclei are discussed on the basis of the Hartree-Fock-Bogoliubov mean-field model and the continuum quasiparticle random phase approximations. We discuss the monopole and quadrupole pair transfer modes in neutron-rich Sn isotopes beyond the N = 82 shell closure. We investigate also how the pair correlation behaves in deformed weakly bound nuclei, and we show that the neutron pairing enhances as the binding energy of neutrons becomes small.

    DOI: 10.1063/1.3442639

    Web of Science

    researchmap

  • CONTINUUM COUPLING AND PAIR CORRELATION IN WEAKLY BOUND DEFORMED NUCLEI 査読

    Hiroshi Oba, Masayuki Matsuo

    INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS   18 ( 10 )   2015 - 2019   2009年11月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WORLD SCIENTIFIC PUBL CO PTE LTD  

    We formulate a new Hartree-Fock-Bogoliubov method applicable to weakly bound deformed nuclei using the coordinate-space Green's function technique. An emphasis is put on treatment of quasiparticle states in the continuum, on which we impose the correct boundary condition of the asymptotic out-going wave. We illustrate this method with numerical examples.

    DOI: 10.1142/S0218301309014202

    Web of Science

    researchmap

  • Continuum Hartree-Fock-Bogoliubov theory for weakly bound deformed nuclei using the coordinate-space Green's function method 査読

    Oba Hiroshi, Matsuo Masayuki

    PHYSICAL REVIEW C   80 ( 2 )   2009年8月

  • Microscopic description of oblate-prolate shape mixing in proton-rich Se isotopes 査読

    Nobuo Hinohara, Takashi Nakatsukasa, Masayuki Matsuo, Kenichi Matsuyanagi

    PHYSICAL REVIEW C   80 ( 1 )   2009年7月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    The oblate-prolate shape coexisting/mixing phenomena in proton-rich (68,70,72)Se are investigated by means of the adiabatic self-consistent collective coordinate (ASCC) method. The one-dimensional collective path and the collective Hamiltonian describing the large-amplitude shape vibration are derived in a fully microscopic way. The excitation spectra, B(E2) and spectroscopic quadrupole moments are calculated by requantizing the collective Hamiltonian and solving the collective Schroumldinger equation. The basic properties of the coexisting two rotational bands in low-lying states of these nuclei are well reproduced. It is found that the oblate-prolate shape mixing becomes weak as the rotational angular momentum increases. We point out that the rotational energy plays a crucial role in causing the localization of the collective wave function in the (beta,gamma) deformation space.

    DOI: 10.1103/PhysRevC.80.014305

    Web of Science

    researchmap

  • Continuum quasiparticle linear response theory using the Skyrme functional for multipole responses of exotic nuclei 査読

    Mizuyama Kazuhito, Matsuo Masayuki, Serizawa Yasuyoshi

    PHYSICAL REVIEW C   79 ( 2 )   2009年2月

  • Di-Neutron Correlation in Soft Octupole Excitations of Neutron-Rich Ni Isotopes beyond N=50 査読

    Yasuyoshi Serizawa, Masayuki Matsuo

    PROGRESS OF THEORETICAL PHYSICS   121 ( 1 )   97 - 119   2009年1月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE  

    We investigate the low-lying octupole response of neutron-rich Ni isotopes beyond the N = 50 shell closure using the Skyrme-Hartree-Fock-Bogoliubov mean fields and the continuum quasi-particle random phase approximation. Performing detailed numerical analyses employing the Skyrme parameter set SLy4 and a density-dependent delta interaction of the mixed type, we show that a neutron mode emerges above the neutron separation energy as a consequence of the weak binding of neutrons and that it strongly influences the di-neutron correlation.

    DOI: 10.1143/PTP.121.97

    Web of Science

    researchmap

  • Coupled-Channel Green's Function Approach to Deformed Continuum Hartree-Fock-Bogoliubov Theory 査読

    Hiroshi Oba, Masayuki Matsuo

    NUCLEAR STRUCTURE AND DYNAMICS '09   1165   263 - 266   2009年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    We formulate the coordinate-space Hartree-Fock-Bogoliubov (HFB) theory which can describe pair correlated and deformed nuclei near the drip-lines. In order to ensure the correct asymptotic form of weakly bound and continuum quasiparticle states, we adopt a coupled-channel representation based on the partial wave expansion, and then we construct the exact HFB Green's function. Numerical examples calculated for (38)Mg are discussed.

    Web of Science

    researchmap

  • Collective path and inertial mass of large-amplitude collective dynamics: Application to shape coexistence 査読

    Nobuo Hinohara, Takashi Nakatsukasa, Masayuki Matsuo, Kenichi Matsuyanagi

    4TH INTERNATIONAL WORKSHOP ON NUCLEAR FISSION AND FISSION-PRODUCT SPECTROSCOPY   1175   49 - +   2009年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Large-amplitude collective dynamics of oblate-prolate shape coexistence in the low-lying states of proton-rich Se-68,Se-70,Se-72 are studied. The collective path (collective submanifold) is extracted from the time-dependent Hartree-Fock-Bogoliubov (HFB) manifold by use of the adiabatic self-consistent collective coordinate (ASCC) method. The inertial functions for the large-amplitude collective vibration along the collective path and for the three-dimensional rotation are microscopically calculated. Solving the collective Schrodinger equation, excitation spectra, E2 transition probabilities, and spectroscopic quadrupole moments are evaluated.

    Web of Science

    researchmap

  • Deformation around neutron-rich Cr isotopes in axially symmetric Skyrme-Hatree-Fock-Bogoliubov method 査読

    Hiroshi Oba, Masayuki Matsuo

    PROGRESS OF THEORETICAL PHYSICS   120 ( 1 )   143 - 157   2008年7月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE  

    We analyse the deformation mechanism in neutron-rich Cr, Fe and Ti isotopes with N = 32-44 using a Skyrme-Hartree-Fock-Bogoliubov mean-field code employing a two-dimensional mesh representation in the cylindrical coordinate system. Evaluating the quadrupole deformation energy systematically; we show that the Skyrme parameter set SkM* gives a quadrupole instability around the neutron numbers N similar to 38-42 in Cr isotopes, where the deformation energy curve suggests a transitional behavior with a shallow minimum extending to a. large prolate deformation. The roles of a deformed N = 38 gap and the position of the neutron g(9/2) orbit are analysed in detail.

    DOI: 10.1143/PTP.120.143

    Web of Science

    researchmap

  • Microscopic derivation of collective Hamiltonian by means of the adiabatic self-consistent collective coordinate method 査読

    Nobuo Hinohara, Takashi Nakatsukasa, Masayuki Matsuo, Kenichi Matsuyanagi

    PROGRESS OF THEORETICAL PHYSICS   119 ( 1 )   59 - 101   2008年1月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE  

    The microscopic dynamics of oblate-prolate shape coexistence/mixing phenomena in (68) Se and Kr-72 are studied by means of the adiabatic self-consistent collective coordinate (ASCC) method in conjunction with the pairing-plus-quadrupole (P + Q) Hamiltonian, including the quadrupole pairing interaction. A quantum collective Hamiltonian is constructed, and excitation spectra, spectroscopic quadrupole moments and quadrupole transition properties are evaluated. The effect of the time-odd pair field on the collective mass (inertia function) of the large-amplitude vibration and the rotational moments of inertia about three principal axes is evaluated. It is found that the basic properties of the shape coexistence/mixing are qualitatively reproduced. The results of the calculation indicate that the oblate-prolate shape mixing decreases as the angular momentum increases.

    DOI: 10.1143/PTP.119.59

    Web of Science

    researchmap

  • Gauge-invariant formulation of the adiabatic self-consistent collective coordinate method 査読

    Nobuo Hinohara, Takashi Nakatsukasa, Masayuki Matsuo, Kenichi Matsuyanagi

    PROGRESS OF THEORETICAL PHYSICS   117 ( 3 )   451 - 478   2007年3月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE  

    The adiabatic self-consistent collective coordinate (ASCC) method is a practical microscopic theory of large-amplitude collective motion in nuclei with superfluidity. We show that its basic equations are invariant under transformations involving the gauge angle in particle-number space. By virtue of this invariance, a clean separation of the large-amplitude collective motion and the pairing rotational motion can be made, and this allows us to restore the particle-number symmetry broken by the Hartree-Fock-Bogoliubov (HFB) approximation. We formulate the ASCC method explicitly in a gauge-invariant form. In solving the ASCC equations, it is necessary to fix the gauge. Applying this new formulation to the multi-O(4) model, we compare different gauge-fixing procedures and demonstrate that calculations using different gauges indeed yield the same results for gauge-invariant quantities, such as the collective path and quantum spectra. We propose a gauge-fixing prescription that seems most convenient in realistic calculations.

    DOI: 10.1143/PTP.117.451

    Web of Science

    researchmap

  • Effects of time-odd components in mean field on large amplitude collective dynamics 査読

    N Hinohara, T Nakatsukasa, M Matsuo, K Matsuyanagi

    PROGRESS OF THEORETICAL PHYSICS   115 ( 3 )   567 - 599   2006年3月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE  

    We apply the adiabatic self-consistent collective coordinate (ASCC) method to the multi-O(4) model and study the collective mass (inertia function) of many-body tunneling motion. Comparing the results with those obtained from the exact diagonalization, we show that the ASCC method is capable of describing the gradual change of the excitation spectra from an anharmonic vibration about a spherical shape to a doublet pattern associated with a deformed double-well potential possessing oblate-prolate symmetry. It is found that the collective mass is significantly increased by the quadrupole-pairing contribution to time-odd components of the moving mean field. In contrast, the cranking (Inglis-Belyaev) mass based on the constrained mean field, which ignores the time-odd components, is smaller than the ASCC mass and fails to reproduce the exact spectra.

    DOI: 10.1143/PTP.115.567

    Web of Science

    researchmap

  • Di-neutron correlation and soft dipole excitation in medium mass neutron-rich nuclei near drip line 査読

    M Matsuo, K Mizuyama, Y Serizawa

    PHYSICAL REVIEW C   71 ( 6 )   2005年6月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMERICAN PHYSICAL SOC  

    The neutron pairing correlation and the soft dipole excitation in medium mass nuclei near the drip line are investigated from the viewpoint of the di-neutron correlation. Numerical analyses based on the coordinate-space Hartree-Fock-Bogoliubov method and the continuum quasiparticle random phase approximation are performed for even-even O18-24,Ca50-58, and Ni80-86. A clear signature of the di-neutron correlation is found in the ground state; two neutrons are correlated at short relative distances less than or similar to 2 fm with large probability similar to 50%. The soft dipole excitation is influenced strongly by the neutron pairing correlation, and it accompanies a large transition density for pair motion of neutrons. This behavior originates from a coherent superposition of two-quasiparticle configurations [l x (l + 1)](L=1) consisting of continuum states with high orbital angular momenta l reaching an order of l similar to 10. It suggests that the soft dipole excitation under the influence of neutron pairing is characterized by the motion of di-neutron in the nuclear exterior against the remaining A-2 subsystem. Sensitivity to the density dependence of the effective pair force is discussed.

    DOI: 10.1103/PhysRevC.71.064326

    Web of Science

    researchmap

  • Collective paths connecting the oblate and prolate shapes in Se-68 and Kr-72 suggested by the adiabatic self-consistent collective coordinate method 査読

    M Kobayashi, T Nakatsukasa, M Matsuo, K Matsuyanagi

    PROGRESS OF THEORETICAL PHYSICS   113 ( 1 )   129 - 152   2005年1月

     詳細を見る

    記述言語:英語   出版者・発行元:PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE  

    By means of the adiabatic self-consistent collective coordinate method and the pairing-plus-quadrupole interaction, we have for the first time obtained a self-consistent collective path connecting the oblate and prolate local minima in Se-68 and Kr-72. This self-consistent collective path is found to run approximately along the valley connecting the oblate and prolate local minima in the collective potential energy landscape. The result of this calculation clearly indicates the importance of triaxial deformation dynamics in oblate-prolate shape coexistence phenomena.

    DOI: 10.1143/PTP.113.129

    Web of Science

    researchmap

  • Di-neutron correlations in medium-mass neutron-rich nuclei near the dripline 査読

    M Matsuo, K Mizuyama, Y Serizawa

    EUROPEAN PHYSICAL JOURNAL A   25   563 - 565   2005年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    On the basis of the coordinate-space Hartree-Fock-Bogoliubov and the continuum quasiparticle random phase approximation (QRPA) theories, we demonstrate that a di-neutron correlation exists in the ground states of medium-mass neutron-rich nuclei near the dripline, and we suggest that the soft dipole excitation has the character of di-neutron motion against the remaining A - 2 subsystem.

    DOI: 10.1140/epjad/i2005-06-045-9

    Web of Science

    researchmap

  • Collective path connecting the oblate and prolate local minima in Se-68 査読

    M Kobayasi, T Nakatsukasa, M Matsuo, K Matsuyanag

    PROGRESS OF THEORETICAL PHYSICS   112 ( 2 )   363 - 368   2004年8月

     詳細を見る

    記述言語:英語   出版者・発行元:PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE  

    By means of the adiabatic self-consistent collective coordinate method and the pairing-plus-quadrupole interaction, we have obtained a self-consistent collective path connecting the oblate and prolate local minima in Se-68 for the first time. The result of the calculation indicates the importance of triaxial deformation dynamics in oblate-prolate shape coexistence phenomena.

    DOI: 10.1143/PTP.112.363

    Web of Science

    researchmap

  • Pair correlation and collective excitations: Continuum QRPA approach to exotic nuclei near drip-line 査読

    M Matsuo

    FRONTIERS OF COLLECTIVE MOTIONS (CM2002)   312 - 317   2003年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:WORLD SCIENTIFIC PUBL CO PTE LTD  

    By using the continuum quasiparticle random phase approximation, which we recently formulated on the basis of the coordinate-space Hartree-Fock-Bogoliubov theory, we investigate pairing effects on the low-lying dipole strength in neutron rich oxygen isotopes near the drip-line. The neutron pairing enhances the dipole strength near the threshold, especially in the case of the surface pairing. Analysis shows that spatially correlated spin-singlet neutron pairs (di-neutrons) are formed in the external region, and the low-lying dipole strength is characterized by motion of the correlated neutron pairs against the core.

    DOI: 10.1142/9789812703972_0039

    Web of Science

    researchmap

  • Two-phonon gamma-vibrational state in Er-168 査読

    M Oshima, T Morikawa, Y Hatsukawa, S Ichikawa, N Shinohara, M Matsuo, H Kusakari, N Kobayashi, M Sugawara, T Inamura

    PHYSICAL REVIEW C   52 ( 6 )   3492 - 3495   1995年12月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMERICAN PHYSICAL SOC  

    In order to identify double-gamma vibrational states in well-deformed regions, we have made a Coulomb excitation experiment for Er-168. We could observe 1235-keV and 962-keV gamma transitions decaying from the 2056-keV 4(+) state. The measured E2 transition probabilities support the assignment of the 4(+) state as a two-phonon gamma-vibrational state.

    DOI: 10.1103/PhysRevC.52.3492

    Web of Science

    researchmap

▶ 全件表示

MISC

  • Application of the Adiabatic Selfconsistent-Collective-Coordinate Method to a Solvable Model of Prolate-Oblate Shape Coexistence

    Progress of Theoretical Physics   110, 65   2003年

     詳細を見る

  • Rotational Damping and Compound Formation in Warm Rotating Nuclei

    AIP Conference Proceedings   656, 32   2002年

     詳細を見る

  • Collective Excitations and Pairing Effects in Drip-Line Nuclei -- Continuum RPA in Coordinate-Space HFB ---

    Progress of Theoretical Physics Supplement   146, 110   2002年

     詳細を見る

  • Coupling between Thermal and Rotational Motion in Nuclei

    Nuclear Physics A   A682   439C   2001年

  • Theoretical Study of the Decay-out spin of superdeformed bands in the Dy and Hg regions

    Nuclear Physics A   A682   464C   2001年

  • ontinuum Linear Response in Coordinate Space Hartree-Fock-Bogoliubov Formalism for Collective Excitations in Drip-line Nuclei

    Nuclear Physics   A696, 371   2001年

  • Correlation and flucutation measures for damped collective motion

    AIP Conference Proceedings   597, 269   2001年

     詳細を見る

  • Symmetry-Unrestricted Skyrme-Hartree-Fock-Bogoliubov Calculations for Exoti c Shapes in N=Z Nuclei from $^{64}$Ge to $^{84}$Mo}

    Nuclear Physics   A693, 579   2001年

     詳細を見る

  • amma-ray strength functions in thermally excited rotating nuclei

    Acta Physica Polonica   B32, 2565   2001年

     詳細を見る

  • Barrier penetration and rotational damping of thermally excited superdeform ed nuclei

    Nuclear Physics   A696, 85   2001年

  • The rotational γ-continuum in the mass region A(]G0526[)100

    Nuclear Physics   A673   64   2000年

     詳細を見る

  • Adiabatic Selfconsistent Collective Coordinate Method for Large Amplitude Collective Motion in Superconducting Nuclei

    Masayuki Matsuo, Takashi Nakatsukasa, Kenichi Matsuyanagi

    Progress of Theoretical Physics   103 ( 5 )   959 - 979   2000年

  • Covariance analysis of selection rules governing the γ-decay cascades of the rotational nucleus <sup>164</sup>Yb

    Nuclear Physics   A671   71   2000年

     詳細を見る

  • Spreading width of compound states through coincidence spectra of rotational gamma-rays

    M Matsuo, T Dossing, B Herskind, S Leoni, E Vigezzi, RA Broglia

    PHYSICS LETTERS B   465 ( 1-4 )   1 - 7   1999年10月

     詳細を見る

    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE BV  

    The intrinsic width of (multiparticle-multihole) compound states is an elusive quantity, of difficult direct access, as it is masked by damping mechanisms which control the collective response of nuclei. Through microscopic cranked shell model calculations, it is found that the strength function associated with two-dimensional gamma-coincidence spectra arising from rotational transitions between states lying at energies &gt; 1 MeV above the yrast line, exhibits a two-component structure controlled by the rotational (wide component) and compound (narrow component) damping width. This last component is found to be directly related to the width of the multiparticle-multihole autocorrelation function. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0370-2693(99)01058-8

    Web of Science

    CiNii Article

    researchmap

  • Unresolved γ rays in 114Te: Mass dependence of rotational damping

    S. Frattini, A. Bracco, S. Leoni, F. Camera, B. Million, N. Blasi, G. lo Bianco, M. Pignanelli, E. Vigezzi, B. Herskind, T. Døssing, M. Bergström, P. Varmette, S. Törmänen, A. Maj, M. Kmiecik, D. R. Napoli, M. Matsuo

    Physical Review Letters   83 ( 25 )   5234 - 5237   1999年1月

     詳細を見る

    記述言語:英語  

    Unresolved γ rays of 114Te sorted into one- and two-dimensional spectra were studied. The reaction 64Ni(Ebeam = 230-270MeV)+54 Cr was used and the γ rays were detected with the EUROBALL array. The effective moment of inertia for the quasicontinuum was found to be almost constant for I=(20-40)ħ, in contrast with the decreasing behavior of the terminating yrast band. A comparative analysis with the nucleus 164Yb is presented and the results from a fluctuation analysis were compared with cranked shell model calculations. The comparison shows consistency in the scaling of the rotational damping width with mass number. © 1999 The American Physical Society.

    DOI: 10.1103/PhysRevLett.83.5234

    Scopus

    researchmap

  • Scaling Analysis of Fluctuating strength Function

    Physical Review   C60 ( 3 )   034307   1999年

  • Multistep Rotational Energy Correlations probed by High Fold γ coincidence Data

    Europhysics Journal   A4   229   1999年

     詳細を見る

  • Tetrahedral and triangular deformations of Z=N nuclei in mass region A similar to 60-80

    S Takami, K Yabana, M Matsuo

    PHYSICS LETTERS B   431 ( 3-4 )   242 - 248   1998年7月

     詳細を見る

    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE BV  

    We study static non-axial octupole deformations in proton-rich Z=N nuclei, Ge-64, Se-68, Kr-72, Sr-76, Zr-80 and Mo-84, by using the Skyrme Hartree-Fock plus BCS calculation with no restrictions on the nuclear shape. The calculation predicts that the oblate ground state in Se-68 is extremely soft for the Y-33 triangular deformation, and that in Zr-80 the low-lying local minimum state coexisting with the prolate ground state has the Y-32 tetrahedral deformation. (C) 1998 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0370-2693(98)00545-0

    Web of Science

    CiNii Article

    researchmap

  • Shell effects on Rotational Damping in Superdeformed Nuclei

    Nuclear Physics   A636   169   1998年

     詳細を見る

  • Level Statistics of Near-Yrast states in Rapidly Rotating Nuclei

    Nuclear Physics   A620   296   1997年

     詳細を見る

  • Shell Model for Warm Rotating Nuclei(jointly worked)

    Nuclear Physics   A617   1   1997年

     詳細を見る

  • Study of band mixing in the rotational quasi-continuum

    A Bracco, P Bosetti, S Leoni, S Frattini, E Vigezzi, T Dossing, B Herskind, M Matsuo

    PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, VOL 38   38   185 - 194   1997年

     詳細を見る

    記述言語:英語   出版者・発行元:PERGAMON PRESS LTD  

    The rotational continuum for normally deformed nuclei of the rare earth region is investigated making use of statistical analysis methods, With these techniques it is possible to extract information on the rotational motion from the region of high level density, in this connection, two points will be discussed: i) the important role of the residual interaction in the description of the experimental data and ii) the dependence of the mixing among rotational bands on the symmetry quantum numbers of the nuclear states, This last point was investigated for the nucleus Er-163 for which it has been found that the gamma-cascades feeding into low-K bands are different from those feeding high-K bands, This result indicates that the K-selection rules are effective for excited rotational bands within the angular momentum 30h less than or equal to I less than or equal to 40h.

    DOI: 10.1016/S0146-6410(97)00026-4

    Web of Science

    CiNii Article

    researchmap

  • From Discrete Rotational Bands to Damped Rotational Motion

    Zeitschrift f(]J1168[)r Physik   358 ( 2 )   207 - 211   1997年

     詳細を見る

  • Onset of Rotational Damping in Superde formed Nuclei(jointly worked)

    Nuclear Physics   Ab12   26   1997年

     詳細を見る

  • Scars of Discrete Rotational Bands in Hot Nuclei(jointly worked)

    Zeitschnft F(]E88DB[)r Physik   356 ( 3 )   259 - 262   1996年

     詳細を見る

  • Microscopic Simulations of γ Cascacles in Warm Rotating Nuclei(jointly worked)

    Physical Review Letters   76 ( 24 )   4484 - 4487   1996年

  • Fluctuation Analysis of Rotational Spectra(jointly worked)

    Physics Report   268   1   1996年

  • THE DISTRIBUTION OF THE ROTATIONAL TRANSITION STRENGTH IN WARM NUCLEI STUDIED THROUGH GAMMA-RAY CORRELATIONS

    S LEONI, B HERSKIND, T DOSSING, P RASMUSSEN, P BOSETTI, A BRACCO, S FRATTINI, M MATSUO, N NICA, E VIGEZZI, A ATAC, M BERGSTROM, A BROCKSTEDT, H CARLSSON, P EKSTROM, F INGEBRETSEN, HJ JENSEN, J JONGMAN, GB HAGEMANN, RM LIEDER, T LONNROTH, A MAJ, B MILLION, A NORDLUND, J NYBERG, M PIIPARINEN, H RYDE, DC RADFORD, M SUGAWARA, PO TJOM, A VIRTANEN

    NUCLEAR PHYSICS A   587 ( 3 )   513 - 540   1995年5月

     詳細を見る

    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE BV  

    The study of damping of rotational motion applying the rotational plane mapping (RPM) method is presented and discussed. The aim of this technique is to extract the distribution of the rotational transition strength from an analysis of the shape of the ''central valley'' of two- and three-dimensional gamma-ray spectra. The method is applied to a triple gamma-coincidence data set of Tm-162,Tm-163 nuclei formed in Cl-37+Te-130 reactions. The rotational transition strength is obtained as a function of rotational frequency for selected regions of entry states, and the width is found to be rather constant and approximately equal to 80 keV. This value is significantly smaller than the value predicted theoretically for the rotational damping width Gamma(rct). Also the ratio between the observed depth and width of both the 2D and 3D valleys does not agree with the simple model adopted in the RPM method, These discrepancies point to the presence of both a wide and a narrow component in the distribution of rotational strength as extracted by the RPM method. The analysis of simulated spectra obtained on the basis of realistic band-mixing calculations, including residual interactions, confirms this behaviour.

    DOI: 10.1016/0375-9474(95)00024-U

    Web of Science

    CiNii Article

    researchmap

  • Two-phonon γ-vibrational state in <sup>168</sup>Yb

    Physical Review   C52   3492   1995年

     詳細を見る

  • TOWAROS COMPLETE SPECTROSCOPY IN RAPIDLY ROTATING NUCLEI

    ACTA PHYSICA POLONICA B   26 ( 2-3 )   153   1995年

     詳細を見る

  • A Finite Number of Regular Rotational Bands in the Superdeformed Well of <sup>143</sup>Eu(jointly worked)

    Physics Letters   353 ( 2/3 )   179 - 183   1995年

  • Two and Three Dimensional Gamma Ray Correlations in Rotational Nuclei (jointly worked)

    Nuclear Physics A   557,191C   1993年

  • Fluctuation Analysis of the Rotational Motion of Excited Nuclei (jointly worked)

    Nuclear Physics A   553,505C   1993年

  • Poisson and Porter-Thomas fluctuations in off-yrast rotational transitions (jointly worked)

    Nuclear Physics A   564,345   1993年

  • Count fluctuations in Multi-fold γ-spectra and the onset of Damping in Deformed and Superdeformed Nuclei (jointly worked)

    Proceedings of International Seminar on the Frontiers of Nuclear Spectroscopy   1993年

     詳細を見る

  • Microscopic Origin of Quantum Chaos in Rotational Damping (jointly worked)

    Physical Review Letters   70 ( 18 )   2694 - 2697   1993年

  • Chaotic Behavior in Warm Deformed Nuclei Induced by Residual Two-body Interactions

    Nuclear Physics A   557,211C   1993年

  • Fluctuations and Mean Field Effects in Rotational Damping (jointly worked)

    Nuclear Physics A   557,181C   1993年

  • FLUCTUATION ANALYSIS OF ROTATIONAL DECAY FROM EXCITED NUCLEI

    B HERSKIND, A BRACCO, RA BROGLIA, T DOSSING, A IKEDA, S LEONI, J LISLE, M MATSUO, E VIGEZZI

    PHYSICAL REVIEW LETTERS   68 ( 20 )   3008 - 3011   1992年5月

     詳細を見る

    記述言語:英語   出版者・発行元:AMERICAN PHYSICAL SOC  

    A statistical method to analyze the gamma decay of excited, rapidly rotating nuclei is presented. It is based on the fact that the cooling path of these systems goes through regions of both suppressed and enhanced fluctuations typical of large and low level density, respectively. The method is applied to the study of the high-spin quasicontinuum of Yb-167, Yb-168.

    DOI: 10.1103/PhysRevLett.68.3008

    Web of Science

    PubMed

    researchmap

  • Recent Studies of the High-Spin Quasi-Continuum (jointly worked)

    Progress in Particle and Nuclear Physics   28,235   1992年

  • Diabatic Approach to Shape Coexistence Phenomena in Semi-Magic Nudei. I

    Progress of Theoretical Physics   85 ( 2 )   281 - 303   1991年

  • Mean Field Dynamics and Low-Lying Collective Excitations

    Proceedings of Nishinomiya Yukawa Memorial Symposium   1991年

     詳細を見る

  • DAMPED COLLECTIVE VIBRATION IN SCHEMATIC SHELL-MODEL OF HIGHLY EXCITED NUCLEI

    M MATSUO

    PROGRESS OF THEORETICAL PHYSICS   84 ( 6 )   1126 - 1144   1990年12月

     詳細を見る

    記述言語:英語   出版者・発行元:KYOTO UNIV  

    Damping property of the collective vibration is numerically analyzed for a schematic shell model which simulates a giant collective vibration built on compound states. Microscopic mechanism of the motional narrowing of the damping width is investigated in reference to the residual interaction which causes configuration mixing. Statistical aspects of the damping mechanism are also discussed. It is shown that the response function method which we formulated in a preceding paper provides a consistent and microscopic description of the damped collective vibration embedded in the highly excited region.

    DOI: 10.1143/PTP.84.1126

    Web of Science

    CiNii Article

    researchmap

  • QUANTUM STATISTICAL-THEORY OF DAMPED COLLECTIVE TRANSITION IN HIGHLY EXCITED NUCLEI

    M MATSUO

    PROGRESS OF THEORETICAL PHYSICS   84 ( 2 )   269 - 290   1990年8月

     詳細を見る

    記述言語:英語   出版者・発行元:KYOTO UNIV  

    DOI: 10.1143/PTP.84.269

    Web of Science

    CiNii Article

    researchmap

  • MASTER-EQUATIONS IN THE MICROSCOPIC THEORY OF NUCLEAR COLLECTIVE DYNAMICS

    F SAKATA, M MATSUO, T MARUMORI, YZ ZHUO

    ANNALS OF PHYSICS   194 ( 1 )   30 - 64   1989年8月

     詳細を見る

    記述言語:英語   出版者・発行元:ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS  

    DOI: 10.1016/0003-4916(89)90031-6

    Web of Science

    researchmap

  • Dissipation Mechanism of the Large-Amplitude Collective Motion

    Drogress of Theoretical Physics   82 ( 6 )   1989年

     詳細を見る

  • MICROSCOPIC ANALYSIS OF THE HEXADECAPOLE STRENGTHS TO THE GAMMA-VIBRATIONAL BANDS

    M MATSUO

    PROGRESS OF THEORETICAL PHYSICS   78 ( 3 )   609 - 615   1987年9月

     詳細を見る

    記述言語:英語   出版者・発行元:KYOTO UNIV  

    DOI: 10.1143/PTP.78.609

    Web of Science

    CiNii Article

    researchmap

  • Microscopic Description of An harmonic Gamma-Vibrations by Means of the Selfconsistent-Collective-Coordinate Method. (]G0003[)

    Progress of Theoretical Physics   78 ( 3 )   591 - 608   1987年

  • Microscopic Description of Anharmonic Gamma-Vibrations by Means of the selfconsistent-Collective-Coordinate Method. (]G0002[)

    Progress of Theoretical Physics   76 ( 1 )   93 - 114   1986年

▶ 全件表示

共同研究・競争的資金等の研究

  • Study of Nuclear Structure at High Spin

      詳細を見る

    資金種別:競争的資金

    researchmap

  • 高スピン原子核構造の研究, 不安定原子核構造の研究

      詳細を見る

    資金種別:競争的資金

    researchmap

 

担当経験のある授業科目

  • 計算物理学A

    2020年
    -
    現在
    機関名:新潟大学

  • 現代物理学セミナーB

    2020年
    -
    現在
    機関名:新潟大学

  • 現代物理学セミナーA

    2020年
    -
    現在
    機関名:新潟大学

  • 計算物理学B

    2020年
    -
    現在
    機関名:新潟大学

  • Advances in Physics and Chemistry

    2020年
    -
    現在
    機関名:新潟大学

  • 物理学特論I

    2020年
    -
    現在
    機関名:新潟大学

  • 量子力学IB

    2019年
    -
    現在
    機関名:新潟大学

  • 原子核物理学

    2019年
    -
    現在
    機関名:新潟大学

  • 量子力学IA

    2019年
    -
    現在
    機関名:新潟大学

  • 原子核物理学II

    2018年
    機関名:新潟大学

  • 数理物質科学特定研究Ⅱ(物理学)

    2015年
    機関名:新潟大学

  • 研究発表演習・発表Ⅱ

    2015年
    機関名:新潟大学

  • 原子核物理特論III

    2014年
    -
    現在
    機関名:新潟大学

  • 自然科学総論Ⅰ

    2014年
    機関名:新潟大学

  • プロジェクト研究特別概説

    2013年
    -
    現在
    機関名:新潟大学

  • 研究発表演習・発表Ⅰ

    2013年
    -
    2015年
    機関名:新潟大学

  • Introduction to Frontiers in Physics

    2013年
    -
    2014年
    機関名:新潟大学

  • 課題探索特講

    2012年
    -
    2015年
    機関名:新潟大学

  • 数理物質科学演習Ⅰ(物理学)

    2012年
    -
    2015年
    機関名:新潟大学

  • 数理物質科学特定研究Ⅰ(物理学)

    2012年
    -
    2015年
    機関名:新潟大学

  • 数理物質科学演習Ⅲ(物理学)

    2012年
    -
    2015年
    機関名:新潟大学

  • 数理物質科学特定研究ⅡA(物理学)

    2012年
    -
    2015年
    機関名:新潟大学

  • 研究発表演習・発表Ⅲ

    2012年
    -
    2015年
    機関名:新潟大学

  • 数理物質科学特定研究ⅡB(物理学)

    2012年
    -
    2015年
    機関名:新潟大学

  • コラボレーション演習

    2012年
    -
    2015年
    機関名:新潟大学

  • 数理物質科学演習Ⅱ(物理学)

    2012年
    -
    2015年
    機関名:新潟大学

  • 数理物質科学特定研究Ⅲ(物理学)

    2012年
    -
    2015年
    機関名:新潟大学

  • 原子核物理特論Ⅱ

    2012年
    機関名:新潟大学

  • リサーチキャンプ

    2012年
    機関名:新潟大学

  • 論文演習

    2012年
    機関名:新潟大学

  • プロジェクト研究演習

    2012年
    機関名:新潟大学

  • 先端プロジェクト研究(分析・評価)特別演習

    2012年
    機関名:新潟大学

  • サブアトミック物理学Ⅰ

    2011年
    -
    2019年
    機関名:新潟大学

  • 原子核物理特論Ⅲ

    2011年
    -
    2016年
    機関名:新潟大学

  • 原子核理論特論

    2011年
    機関名:新潟大学

  • 量子力学I

    2010年
    -
    現在
    機関名:新潟大学

  • 現代物理学

    2010年
    機関名:新潟大学

  • 物理学最前線入門

    2010年
    機関名:新潟大学

  • 課題研究a

    2010年
    機関名:新潟大学

  • 課題研究b

    2010年
    機関名:新潟大学

  • 物理学基礎ゼミ

    2010年
    機関名:新潟大学

  • 物理学基礎A II

    2009年
    -
    2015年
    機関名:新潟大学

  • 計算物理学

    2008年
    -
    現在
    機関名:新潟大学

  • 原子核物理学I

    2008年
    -
    2017年
    機関名:新潟大学

  • サブアトミック物理学Ⅱ

    2008年
    -
    2011年
    機関名:新潟大学

  • ハドロン物理学Ⅱ

    2008年
    -
    2011年
    機関名:新潟大学

  • 物理学基礎BⅠ

    2008年
    機関名:新潟大学

  • 量子力学演習I

    2007年
    -
    現在
    機関名:新潟大学

  • 量子力学序論

    2007年
    機関名:新潟大学

  • 物理学基礎BI

    2007年
    機関名:新潟大学

  • ハドロン物理学II

    2007年
    機関名:新潟大学

  • サブアトミック物理学II

    2007年
    機関名:新潟大学

▶ 全件表示