Updated on 2022/12/01

写真a

 
GOTO Shin-ichi
 
Organization
Academic Assembly Institute of Science and Technology Fundamental Sciences Associate Professor
Faculty of Science Associate Professor
Graduate School of Science and Technology Fundamental Sciences Chemistry Associate Professor
Title
Associate Professor
External link

Degree

  • 博士(理学) ( 2002.3   新潟大学 )

Research Interests

  • 核・放射化学

  • Superheavy elements

Research Areas

  • Nanotechnology/Materials / Inorganic/coordination chemistry

  • Energy Engineering / Quantum beam science

  • Natural Science / Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics

Research History (researchmap)

  • Niigata University   Graduate School of Science and Technology   Associate Professor

    2012.4

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  • Niigata University   Institute for Research Promotion Center for Instrumental Analysis   Associate Professor

    2011.4 - 2012.3

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  • Niigata University   Associate Professor

    2007.4 - 2011.3

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  • Niigata University   Associate Professor (as old post name)

    2003.4 - 2007.3

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  • Niigata University   Research Assistant

    2001.8 - 2003.3

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Research History

  • Niigata University   Graduate School of Science and Technology Fundamental Sciences Chemistry   Associate Professor

    2012.4

  • Niigata University   Faculty of Science Department of Chemistry   Associate Professor

    2012.4 - 2017.3

  • Niigata University   Center for Instrumental Analysis   Associate Professor

    2007.4 - 2012.3

  • Niigata University   Center for Instrumental Analysis   Associate Professor (as old post name)

    2003.4 - 2007.3

  • Niigata University   Faculty of Science   Research Assistant

    2001.8 - 2003.3

Education

  • Niigata University   自然科学研究科   エネルギー基礎科学

    - 2001

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    Country: Japan

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  • Niigata University   Graduate School, Division of National Science and Technology

    - 2001

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  • Niigata University   Faculty of Science   Department of Chemistry

    - 1995

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    Country: Japan

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  • Niigata University   Faculty of Science

    - 1995

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Professional Memberships

 

Papers

  • Isothermal gas chromatography study of Zr and Hf tetrachlorides using radiotracers of 88Zr and 175Hf ---Towards investigation of gas-phase chemistry of Rf--- Reviewed

    K. Shirai, S. Goto, K. Ooe, H. Kudo

    Journal of Nuclear and Radiochemical Sciences   21   7 - 14   2021.3

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  • Systematic Studies of Asymmetric Mass Distributions in Proton-induced Fission of Actinides Reviewed

    S. Goto, D. Kaji, I. Nishinaka, Y. Nagame, S. Ichikawa, K. Tsukada, M. Asai, H. Haba, S. Mitsuoka, K. Nishio, M. Sakama, Y. L. Zhao, K. Sueki, M. Tanikawa, K. Takamiya, H. Kudo, H. Nakahara

    Journal of Nuclear and Radiochemical Sciences   3 ( 1 )   63 - 65   2002

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Nuclear and Radiochemical Sciences  

    In order to clarify the relationship between a mass distribution and shell structure of the fission fragments in nuclear fission, the fragment mass and the kinetic energy distributions in the proton-induced fission of plutonium isotopes, <SUP>239, 242, 244</SUP>Pu, were precisely measured using a double time-of-flight system. It was found that the position of the light side of the heavy asymmetric mass distributions shifts to a larger fragment mass number according to the neutron-proton ratio, N<SUB>f</SUB>/Z<SUB>f</SUB>, of the fissioning nucleus. The result is qualitatively explained by the change of the most probable mass number of fission fragments for Z=50 proton shell.

    DOI: 10.14494/jnrs2000.3.63

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  • Isomeric yield ratios of fission products in proton-induced fission of232Th Reviewed

    S. Goto, D. Kaji, H. Kudo, M. Fujita, T. Shinozuka, M. Fujioka

    Journal of Radioanalytical and Nuclear Chemistry   239 ( 1 )   109 - 112   1999.1

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Isomeric yield ratios of 11 fission products were measured in the system of 13 MeV proton-induced fission of Th-232 by an on-line ion-guide isotope separator. It was found that the closed shell structures of primary fragments and their complementary fragments affect the isomeric yield ratios. Isomeric yield ratios of Cd-121 (11/2(-), 3/2(+)) and Xe-135 (11/2(-), 3/2(+)) were measured precisely in the proton energy range of 13 to 26 MeV to investigate their energy dependence. It was found that the isomeric yield ratios increased slightly with proton energy. The results were discussed in connection with the deformation of fission fragments and fission modes.

    DOI: 10.1007/bf02349539

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    Other Link: http://link.springer.com/article/10.1007/BF02349539/fulltext.html

  • Determination of Fusion Barrier Distributions from Quasielastic Scattering Cross Sections towards Superheavy Nuclei Synthesis Reviewed

    Taiki Tanaka, Yoshihiro Narikiyo, Kosuke Morita, Kunihiro Fujita, Daiya Kaji, Kouji Morimoto, Sayaka Yamaki, Yasuo Wakabayashi, Kengo Tanaka, Mirei Takeyama, Akira Yoneda, Hiromitsu Haba, Yukiko Komori, Shinya Yanou, Benoît Jean-Paul Gall, Zouhair Asfari, Hugo Faure, Hiroo Hasebe, Minghui Huang, Jumpei Kanaya, Masashi Murakami, Atsushi Yoshida, Takayuki Yamaguchi, Fuyuki Tokanai, Tomomi Yoshida, Shoya Yamamoto, Yuki Yamano, Kenyu Watanabe, Satoshi Ishizawa, Masato Asai, Ryuji Aono, Shin-ichi Goto, Kenji Katori, Kouichi Hagino

    Journal of the Physical Society of Japan   87 ( 1 )   014201 - 014201   2018.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Physical Society of Japan  

    In order to study the nucleus-nucleus interactions for syntheses of superheavy nuclei, we measured excitation functions for the quasielastic scattering of Ca-48+Pb-208, Ti-50+Pb-208, and Ca-48+Cm-248 using the gas-filled-type recoil ion separator GARIS. The quasielastic scattering events were clearly separated from deep-inelastic events by using GARIS and its focal plan detectors, except for high-incident-energy points. The quasielastic barrier distributions were successfully extracted for these systems, and compared with coupled-channels calculations. The results of the calculations indicate that vibrational and rotational excitations of the colliding nuclei, as well as neutron transfers before contact, strongly affect the structure of the barrier distribution. For the reactions of Ca-48+Pb-208 and Ti-50+Pb-208, a local maximum of the barrier distribution occurred at the same energy as the peak of the 2n evaporation cross section of the system. On the other hand, for the hot fusion reaction of Ca-48+Cm-248, the 4n evaporation cross section of the system peaks at energies well above the maximum of the barrier distribution. This may be attributed to the deformation of the target nucleus. We argue that these findings can be utilized to locate the optimal energy for future searches for undiscovered superheavy nuclei.

    DOI: 10.7566/jpsj.87.014201

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  • Role of Multichance Fission in the Description of Fission-Fragment Mass Distributions at High Energies Reviewed

    K. Hirose, K. Nishio, S. Tanaka, R. Léguillon, H. Makii, I. Nishinaka, R. Orlandi, K. Tsukada, J. Smallcombe, M. J. Vermeulen, S. Chiba, Y. Aritomo, T. Ohtsuki, K. Nakano, S. Araki, Y. Watanabe, R. Tatsuzawa, N. Takaki, N. Tamura, S. Goto, I. Tsekhanovich, A. N. Andreyev

    Physical Review Letters   119 ( 22 )   2017.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    Fission-fragment mass distributions were measured for U237-240, Np239-242, and Pu241-244 populated in the excitation-energy range from 10 to 60 MeV by multinucleon transfer channels in the reaction O18+U238 at the Japan Atomic Energy Agency tandem facility. Among them, the data for U240 and Np240,241,242 were observed for the first time. It was found that the mass distributions for all the studied nuclides maintain a double-humped shape up to the highest measured energy in contrast to expectations of predominantly symmetric fission due to the washing out of nuclear shell effects. From a comparison with the dynamical calculation based on the fluctuation-dissipation model, this behavior of the mass distributions was unambiguously attributed to the effect of multichance fission.

    DOI: 10.1103/physrevlett.119.222501

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.119.222501/fulltext

  • Decay Measurement of283Cn Produced in the238U(48Ca,3n) Reaction Using GARIS-II Reviewed

    Daiya Kaji, Kouji Morimoto, Hiromitsu Haba, Yasuo Wakabayashi, Mirei Takeyama, Sayaka Yamaki, Yukiko Komori, Shinya Yanou, Shin-ichi Goto, Kosuke Morita

    Journal of the Physical Society of Japan   86 ( 8 )   085001 - 085001   2017.8

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    The production of (283)Cn in the hot fusion reaction of U-238(Ca-48,3n) was confirmed using a new gas-filled recoil ion separator GARIS-II. At the excitation energies of the compound nucleus E* = 34.5 MeV, two decay events from (283)Cn were observed, resulting in the cross section of sigma(3n) = 2.0(-1.3)(+2.7) pb. One is the spontaneous fission with decay time tau = 14.4 s. The other is the 9.45MeV alpha-decay with tau = 5.4 s, followed by the spontaneous fission of (279)Ds (154 ms).

    DOI: 10.7566/jpsj.86.085001

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  • Simultaneous measurement of neutron-induced fission and capture cross sections for 241Am at neutron energies below fission threshold Reviewed

    K. Hirose, K. Nishio, H. Makii, I. Nishinaka, S. Ota, T. Nagayama, N. Tamura, S. Goto, A.N. Andreyev, M.J. Vermeulen, S. Gillespie, C. Barton, A. Kimura, H. Harada, S. Meigo, S. Chiba, T. Ohtsuki

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   856   133 - 138   2017.6

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    Fission and capture reactions were simultaneously measured in the neutron-induced reactions of Am-241 at the spallation neutron facility of the Japan Proton Accelerator Research Complex (J-PARC). Data for the neutron energy range of E-n=0.1-20 eV were taken with the TOF method. The fission events were observed by detecting prompt neutrons accompanied by fission using liquid organic scintillators. The capture reaction was measured by detecting gamma rays emitted in the deexcitation of the compound nuclei using the same detectors, where the prompt fission neutrons and capture gamma rays were separated by a pulse shape analysis. The cross sections were obtained by normalizing the relative yields at the first resonance to evaluations or other experimental data. The ratio of the fission to capture cross sections at each resonance is compared with those from an evaluated nuclear data library and other experimental data. Some differences were found between the present values and the library/literature values at several resonances.

    DOI: 10.1016/j.nima.2016.12.021

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  • Fission fragments mass distributions of nuclei populated by the multinucleon transfer channels of the 18 O + 232 Th reaction Reviewed

    R. Léguillon, K. Nishio, K. Hirose, H. Makii, I. Nishinaka, R. Orlandi, K. Tsukada, J. Smallcombe, S. Chiba, Y. Aritomo, T. Ohtsuki, R. Tatsuzawa, N. Takaki, N. Tamura, S. Goto, I. Tsekhanovich, C.M. Petrache, A.N. Andreyev

    Physics Letters B   761   125 - 130   2016.10

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    DOI: 10.1016/j.physletb.2016.08.010

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  • Startup of a new gas-filled recoil separator GARIS-II Reviewed

    D. Kaji, K. Morimoto, H. Haba, Y. Wakabayashi, Y. Kudou, M. Huang, S. Goto, M. Murakami, N. Goto, T. Koyama, N. Tamura, S. Tsuto, T. Sumita, K. Tanaka, M. Takeyama, S. Yamaki, K. Morita

    Journal of Radioanalytical and Nuclear Chemistry   303 ( 2 )   1523 - 1525   2015.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s10967-014-3706-9

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    Other Link: http://link.springer.com/article/10.1007/s10967-014-3706-9/fulltext.html

  • Production cross sections of niobium and tantalum isotopes in proton-induced reactions on natZr and natHf up to 14MeV Reviewed

    M. Murakami, H. Haba, S. Goto, J. Kanaya, H. Kudo

    Applied Radiation and Isotopes   90   149 - 157   2014.8

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    DOI: 10.1016/j.apradiso.2014.03.014

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  • Excitation functions for production of Rf isotopes in the248Cm+18O reaction Reviewed

    M. Murakami, S. Goto, H. Murayama, T. Kojima, H. Kudo, D. Kaji, K. Morimoto, H. Haba, Y. Kudou, T. Sumita, R. Sakai, A. Yoneda, K. Morita, Y. Kasamatsu, H. Kikunaga, T. K. Sato

    Physical Review C   88 ( 2 )   2013.8

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    Production cross sections of Rf isotopes in the Cm-248+O-18 reaction were measured at the beam energy range of 88.2 to 101.3 MeV by use of a gas-filled recoil ion separator. The excitation functions of (260)Rf, (261)Rfa, and (262)Rf were obtained together with those of spontaneously fissioning nuclides which have few-second half-lives and have been assigned to (261)Rf(b) and a longer-lived state of (262)Rf. The excitation function of few-second spontaneously fissioning nuclide exhibited the maximum cross section at the O-18 beam energy of 94.8 MeV. The shape of the excitation function was almost the same as that of (261)Rfa, whereas it was quite different from those of (260)Rf and (262)Rf. A few-second spontaneously fissioning nuclide previously reported as (261)Rfb and (262)Rf observed in Cm-248+O-18 reaction was identified as (261)Rf(b).

    DOI: 10.1103/physrevc.88.024618

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevC.88.024618/fulltext

  • New Result on the Production of277Cn by the208Pb +70Zn Reaction Reviewed

    Takayuki Sumita, Kouji Morimoto, Daiya Kaji, Hiromitsu Haba, Kazutaka Ozeki, Ryutaro Sakai, Akira Yoneda, Atsushi Yoshida, Hiroo Hasebe, Kenji Katori, Nozomi Sato, Yasuo Wakabayashi, Shin-ichi Mitsuoka, Shin-ichi Goto, Masashi Murakami, Yoshiki Kariya, Fuyuki Tokanai, Keita Mayama, Mirei Takeyama, Toru Moriya, Eiji Ideguchi, Takayuki Yamaguchi, Hidetoshi Kikunaga, Junsei Chiba, Kosuke Morita

    Journal of the Physical Society of Japan   82 ( 2 )   024202 - 024202   2013.2

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    DOI: 10.7566/jpsj.82.024202

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  • SUPERHEAVY ELEMENT SEARCH AT RIKEN - NEW RESULT IN THE PRODUCTION AND DECAY OF AN ISOTOPE, (278)113, OF THE 113TH ELEMENT

    Kosuke Morita, Kouji Morimoto, Daiya Kaji, Hiromitsu Haba, Kazutaka Ozeki, Yuki Kudou, Takayuki Sumita, Yasuo Wakabayashi, Akira Yoneda, Kengo Tanaka, Sayaka Yamaki, Ryutaro Sakai, Takahiro Akiyama, Shin-ichi Goto, Hiroo Hasebe, Minghui Huang, Tianheng Huang, Eiji Ideguchi, Yoshitaka Kasamatsu, Kenji Katori, Yoshiki Kariya, Hidetoshi Kikunaga, Hiroyuki Koura, Hisaaki Kudo, Akihiro Mashiko, Keita Mayama, Shin-ichi Mitsuoka, Toru Moriya, Masashi Murakami, Hirohumi Murayama, Saori Namai, Akira Ozawa, Nozomi Sato, Keisuke Sueki, Mirei Takeyama, Fuyuki Tokanai, Takayuki Yamaguchi, Atsushi Yoshida, Freudenberger, Alf Gook, Christian Eckardt, Joachim Enders, Peter von Neumann-Cosel, Andreas Oberstedt, Stephan Oberstedt, Achim Richter

    FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI, ICFN5   286 - 286   2013

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  • New Result in the Production and Decay of an Isotope,278113, of the 113th Element Reviewed

    Kosuke Morita, Kouji Morimoto, Daiya Kaji, Hiromitsu Haba, Kazutaka Ozeki, Yuki Kudou, Takayuki Sumita, Yasuo Wakabayashi, Akira Yoneda, Kengo Tanaka, Sayaka Yamaki, Ryutaro Sakai, Takahiro Akiyama, Shin-ichi Goto, Hiroo Hasebe, Minghui Huang, Tianheng Huang, Eiji Ideguchi, Yoshitaka Kasamatsu, Kenji Katori, Yoshiki Kariya, Hidetoshi Kikunaga, Hiroyuki Koura, Hisaaki Kudo, Akihiro Mashiko, Keita Mayama, Shin-ichi Mitsuoka, Toru Moriya, Masashi Murakami, Hirohumi Murayama, Saori Namai, Akira Ozawa, Nozomi Sato, Keisuke Sueki, Mirei Takeyama, Fuyuki Tokanai, Takayuki Yamaguchi, Atsushi Yoshida

    Journal of the Physical Society of Japan   81 ( 10 )   103201 - 103201   2012.10

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    An isotope of the 113th element, i.e., 278113, was produced in a nuclear reaction with a 70Zn beam on a 209Bi target. We observed six consecutive \alpha-decays following the implantation of a heavy particle in nearly the same position in the semiconductor detector under an extremely low background condition. The fifth and sixth decays are fully consistent with the sequential decays of 262Db and 258Lr in both decay energies and decay times. This indicates that the present decay chain consisted of 278113, 274Rg (Z=111), 270Mt (Z=109), 266Bh (Z=107), 262Db (Z=105), and 258Lr (Z=103) with firm connections. This result, together with previously reported results from 2004 and 2007, conclusively leads to the unambiguous production and identification of the isotope 278113 of the 113th element.

    DOI: 10.1143/jpsj.81.103201

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  • Sulfate complexation of element 104, Rf, in H2SO4/HNO3 mixed solution Reviewed

    Z. J. Li, A. Toyoshima, M.Asai, K. Tsukada, T.K.Sato, N.Sato, T. Kikuchi, Y.Nagame, M. Schaedel,V. Pershina, X.H.Liang, Y. Kasamatsu, Y. Komori, K.Ooe, A. Shinohara, S.Goto, H. Murayama, M.Murakami, H. Kudo, H.Haba, Y. Takeda, M. Nishikawa, A. Yokoyama, S.Ikarashi, K. Sueki, K. Akiyama, J.V.Kratz

    Radiochimica Acta   100 ( 3 )   157 - 164   2012.3

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    <title>Abstract</title>
    The cation-exchange behavior of <sup>261</sup>Rf (<italic>T</italic>
    <sub>1/2</sub>= 78 s) produced in the <sup>248</sup>Cm(<sup>18</sup>O, 5<italic>n</italic>) reaction was studied on a “one-atom-at-a-time” scale in 0.15–0.69 M H<sub>2</sub>SO<sub>4</sub>/HNO<sub>3</sub> mixed solutions ([H<sup>+</sup>]=1.0 M) using an automated ion-exchange separation apparatus coupled with the detection system for alpha-spectroscopy (AIDA). It was found that adsorption probabilities ( decrease with an increase of [HSO<sub>4</sub>
    <sup>−</sup>], showing a successive formation of Rf sulfate complexes. Rf exhibits a weaker complex formation tendency compared to the lighter homologues Zr and Hf. This is in good agreement with theoretical predictions including relativistic effects.

    DOI: 10.1524/ract.2012.1898

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    Other Link: https://www.degruyter.com/document/doi/10.1524/ract.2012.1898/pdf

  • Fluorido Complex Formation of Element 104, Rutherfordium (Rf)

    Yasuo Ishii, Atsushi Toyoshima, Kazuaki Tsukada, Masato Asai, Zijie Li, Yuichiro Nagame, Sunao Miyashita, Tomotaka Mori, Hideo Suganuma, Hiromitsu Haba, Shin-ichi Goto, Hisaaki Kudo, Kazuhiko Akiyama, Yasuji Oura, Atsushi Shinohara, Matthias Schädel, Valeria Pershina, Jens V. Kratz

    Bulletin of the Chemical Society of Japan   84 ( 9 )   903 - 911   2011.9

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    Publishing type:Research paper (scientific journal)   Publisher:The Chemical Society of Japan  

    DOI: 10.1246/bcsj.20110126

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  • Radiochemical study of sub-barrier fusion hindrance in the 19F+209Bi reaction Reviewed

    I. Nishinaka, Y. Kasamatsu, M. Tanikawa, S. Goto, M. Asai

    Proceedings in Radiochemistry   1 ( 1 )   117 - 121   2011.9

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    <title>Abstract</title>Production cross sections of fission product <sup>99</sup>Mo produced in the reaction of <italic /><sup>19</sup>F + <sup>209</sup>Bi<italic /> have been measured at the incident energies 135–83 MeV near and below the fusion barrier by radiochemical methods. The excitation function for the fusion-fission cross sections in this reaction were deduced down to 80 μb from the measured production cross sections. A systematic analysis of the fusion-fission excitation function shows that sub-barrier fusion hindrance in the heavy mass system <italic /><sup>19</sup>F + <sup>209</sup>Bi<italic /> is different from that in the medium-heavy mass systems but similar to that in the medium-light mass system and in the heavy mass system. This work is the first radiochemical study of sub-barrier fusion hindrance in heavy mass systems.

    DOI: 10.1524/rcpr.2011.0021

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    Other Link: https://www.degruyter.com/document/doi/10.1524/rcpr.2011.0021/pdf

  • Extraction Chromatographic Behavior of Rf, Zr, and Hf in HCl Solution with Styrenedivinylbenzene Copolymer Resin Modified by TOPO (trioctylphosphine oxide) Reviewed

    A. Toyoshima, Y. Kasamatsu, K. Tsukada, M. Asai, Y. Ishii, H. Toume, I. Nishinaka, T. K. Sato, Y. Nagame, M. Schädel, H. Haba, S. Goto, H. Kudo, K. Akiyama, Y. Oura, K. Ooe, A. Shinohara, K. Sueki, J. V. Kratz

    Journal of Nuclear and Radiochemical Sciences   11 ( 1 )   7 - 11   2010

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Nuclear and Radiochemical Sciences  

    DOI: 10.14494/jnrs.11.7

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  • Anionic Fluoro Complex of Element 105, Db Reviewed

    Yoshitaka Kasamatsu, Atsushi Toyoshima, Masato Asai, Kazuaki Tsukada, Zijie Li, Yasuo Ishii, Hayato Toume, Tetsuya K. Sato, Takahiro Kikuchi, Ichiro Nishinaka, Yuichiro Nagame, Hiromitsu Haba, Hidetoshi Kikunaga, Yuki Kudou, Yasuji Oura, Kazuhiko Akiyama, Wataru Sato, Kazuhiro Ooe, Hiroyuki Fujisawa, Atsushi Shinohara, Shin-ichi Goto, Taichi Hasegawa, Hisaaki Kudo, Tomohiro Nanri, Mikio Araki, Norikazu Kinoshita, Akihiko Yokoyama, Fangli Fan, Zhi Qin, Christoph E. Düllmann, Matthias Schädel, Jens V. Kratz

    Chemistry Letters   38 ( 11 )   1084 - 1085   2009.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Chemical Society of Japan  

    We report on the characteristic anion-exchange behavior of the superheavly element dubnium (Db) with atomic number Z = 105 in HF/HNO3 Solution at the fluoride ion concentration [F-] = 0.003 M. The result clearly demonstrates that the fluoro complex formation of Db is significantly different from that of the group-5 homologue Ta in the 6th period of the periodic table while the behavior of Db is similar to that of the lighter homologue Nb in the 5th period.

    DOI: 10.1246/cl.2009.1084

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  • Decay Properties of 266Bh and 262Db Produced in the 248Cm + 23Na Reaction Reviewed

    Kosuke Morita, Kouji Morimoto, Daiya Kaji, Hiromitsu Haba, Kazutaka Ozeki, Yuki Kudou, Nozomi Sato, Takayuki Sumita, Akira Yoneda, Takatoshi Ichikawa, Yasuyuki Fujimori, Sin-ichi Goto, Eiji Ideguchi, Yoshitaka Kasamatsu, Kenji Katori, Yukiko Komori, Hiroyuki Koura, Hisaaki Kudo, Kazuhiro Ooe, Akira Ozawa, Fuyuki Tokanai, Kazuaki Tsukada, Takayuki Yamaguchi, Atsushi Yoshida

    Journal of the Physical Society of Japan   78 ( 6 )   064201 - 064201   2009.6

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    Decay properties of an isotope 266Bh and its daughter nucleus 262Db produced by the 248Cm(23Na,5n) reaction were studied by using a gas-filled recoil separator coupled with a position-sensitive semiconductor detector. 266Bh was clearly identified from the correlation of the known nuclide, 262Db. The obtained decay properties of 266Bh and 262Db are consistent with those observed in the 278113 chain, which provided further confirmation of the discovery of 278113.

    DOI: 10.1143/jpsj.78.064201

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  • Adsorption of Db and its homologues Nb and Ta, and the pseudo-homologue Pa on anion-exchange resin in HF solution Reviewed

    K. Tsukada, H. Haba, M. Asai, A. Toyoshima, K. Akiyama, Y. Kasamatsu, I. Nishinaka, S. Ichikawa, K. Yasuda, Y. Miyamoto, K. Hashimoto, Y. Nagame, S. Goto, H. Kudo, W. Sato, A. Shinohara, Y. Oura, K. Sueki, H. Kikunaga, N. Kinoshita, A. Yokoyama, M. Schaedel, W. Bruechle, J. V. Kratz

    Radiochimica Acta   97 ( 2 )   83 - 89   2009.1

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    Anion-exchange chromatography of element 105, dubnium (Db), produced in the Cm-248(F-19, 5n)(262)Db reaction is investigated together with the homologues Nb and Ta, and the pseudo-homologue Pa in 13.9 M hydrofluoiic acid (HF) solution. The distribution coefficient (K-d) of Db on an anion-exchange resin is successfully determined by running cycles of 1702 chromatographic column separations. The result clearly indicates that the adsorption of Db on the resin is significantly different from that of the homologues and that the adsorption of anionic fluoro complexes of these elements decreases in the sequence of Ta approximate to Nb > Db >= Pa.

    DOI: 10.1524/ract.2009.1577

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  • Target for the heaviest element production at RIKEN

    D. Kaji, K. Morimoto, A. Yoneda, H. Hasebe, A. Yoshida, H. Haba, S. Goto, H. Kudo, K. Morita

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   590 ( 1-3 )   198 - 203   2008.6

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    DOI: 10.1016/j.nima.2008.02.090

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  • Fluoride Complexation of Element 104, Rutherfordium (Rf), Investigated by Cation-exchange Chromatography Reviewed

    Yasuo Ishii, Atsushi Toyoshima, Kazuaki Tsukada, Masato Asai, Hayato Toume, Ichiro Nishinaka, Yuichiro Nagame, Sunao Miyashita, Tomotaka Mori, Hideo Suganuma, Hiromitsu Haba, Masami Sakamaki, Shin-ichi Goto, Hisaaki Kudo, Kazuhiko Akiyama, Yasuji Oura, Hiromichi Nakahara, Yuki Tashiro, Atsushi Shinohara, Matthias Schädel, Willy Brüchle, Valeria Pershina, Jens V. Kratz

    Chemistry Letters   37 ( 3 )   288 - 289   2008.3

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    We report on new and much more precise cation-exchange data of element 104, rutherfordium (Rf), in the fluoride ion concentration [F<SUP>−</SUP>] range of 5.29×10<SUP>−5</SUP>−1.04×10<SUP>−3</SUP> M. The result based on one-atom-at-a-time chemistry clearly demonstrates that the distribution coefficients (<I>K</I><SUB>d</SUB>) decrease with increasing [F<SUP>−</SUP>], suggesting successive fluoride complexation of Rf. The complexation of Rf is briefly discussed in terms of fully relativistic density functional calculation theory.

    DOI: 10.1246/cl.2008.288

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  • Hexafluoro complex of rutherfordium in mixed HF/HNO3 solutions Reviewed

    A. Toyoshima, H. Haba, K. Tsukada, M. Asai, K. Akiyama, S. Goto, Y. Ishii, I. Nishinaka, T. K. Sato, Yuichi Nagame, Wataru Sato, Yuuki Tani, H. Hasegawa, K. Matsuo, D. Saika, Y. Kitamoto, A. Shinohara, M. Ito, J. Saito, H. Kudo, A. Yokoyama, M. Sakama, K. Sueki, Y. Oura, H. Nakahara, M. Schädel, W. Brüchle, J. V. Kratz

    Radiochimica Acta   96 ( 3 )   2008.1

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    DOI: 10.1524/ract.2008.1474

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  • Excitation energy dependence of fragment mass and total kinetic energy distributions in proton-induced fission of uranium isotopes

    I. Nishinaka, M. Tanikawa, S. Goto, K. Nishio, M. Asai, K. Tsukada, Y. Nagame, H. Kudo

    Proc. 23rd Intern. Nucl. Phys. Conf., INPC2007   2   434 - 436   2008

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    DOI: 10.1016/j.nuclphysa.2008.02.149

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  • Observation of Second Decay Chain from278113

    Kosuke Morita, Kouji Morimoto, Daiya Kaji, Takahiro Akiyama, Sin-ichi Goto, Hiromitsu Haba, Eiji Ideguchi, Kenji Katori, Hiroyuki Koura, Hidetoshi Kikunaga, Hisaaki Kudo, Tetsuya Ohnishi, Akira Ozawa, Nozomi Sato, Toshimi Suda, Keisuke Sueki, Fuyuki Tokanai, Takayuki Yamaguchi, Akira Yoneda, Atsushi Yoshida

    Journal of the Physical Society of Japan   76 ( 4 )   045001 - 045001   2007.4

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    DOI: 10.1143/jpsj.76.045001

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  • Experiment on Synthesis of an Isotope277112 by208Pb+70Zn Reaction

    Kosuke Morita, Kouji Morimoto, Daiya Kaji, Takahiro Akiyama, Sin-ichi Goto, Hiromitsu Haba, Eiji Ideguchi, Kenji Katori, Hiroyuki Koura, Hisaaki Kudo, Tetsuya Ohnishi, Akira Ozawa, Toshimi Suda, Keisuke Sueki, Fuyuki Tokanai, Takayuki Yamaguchi, Akira Yoneda, Atsushi Yoshida

    Journal of the Physical Society of Japan   76 ( 4 )   043201 - 043201   2007.4

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    DOI: 10.1143/jpsj.76.043201

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  • Extraction behavior of rutherfordium into tributylphosphate from hydrochloric acid Reviewed

    Hiromitsu Haba, K. Tsukada, M. Asai, A. Toyoshima, Y. Ishii, H. Toume, T. Sato, I. Nishinaka, T. Ichikawa, S. Ichikawa, Yuichi Nagame, W. Sato, K. Matsuo, Y. Kitamoto, Y. Tashiro, Atsushi Shinohara, J. Saito, M. Ito, T. Ikezawa, M. Sakamaki, S. Goto, H. Kudo, H. Kikunaga, M. Arai, S. Kamataki, A. Yokoyama, K. Akiyama, K. Sueki, Y. Oura, M. Schädel, W. Brüchle, Jens Volker Kratz

    Radiochimica Acta   95 ( 1 )   1 - 6   2007.1

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    The extraction behavior of rutherfordium (Rf) into tributylphosphate (TBP) from hydrochloric acid (HCl) has been studied together with those of the lighter group-4 elements Zr and Hf. The extractability of<sup>261</sup>Rf,<sup>169</sup>Hf, and<sup>85</sup>Zr into TBP was investigated under identical conditions in 7.2–8.0 M HCl by on-line reversed-phase extraction chromatography. The percent extractions of Rf, Hf, and Zr into the TBP resin increase steeply with increasing HCl concentration, and the order of extraction is Zr &gt; Hf ≈ Rf. By considering the order of chloride complexation among these elements, it is suggested that the stability of the TBP complex of Rf tetrachloride is lower than those of Zr and Hf.

    DOI: 10.1524/ract.2007.95.1.1

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  • Experiments on synthesis of the heaviest element at RIKEN

    K. Morita, K. Morimoto, D. Kaji, T. Akiyama, S. Goto, H. Haba, E. Ideguchi, R. Kanumgo, K. Katori, H. Kikunaga, H. Koura, H. Kudo, T. Ohnishi, A. Ozawa, N. Sato, T. Suda, K. Sueki, F. Tokanai, H. Xu, T. Yamaguchi, A. Yoneda, A. Yoshida, Y. -L. Zhao

    TOURS SYMPOSIUM ON NUCLEAR PHYSICS VI   891   3 - +   2007

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    At the Institute of Physical and Chemical Research (RIKEN) a series of experiments studying the productions and their decays of the heaviest elements have been performed by using a gas-filled recoil ion separator GARIS. Results on the isotope of the 112th element, (277)112, and on that of the 113th element (278)113, are reviewed. Tow decay chains which are assigned to be ones originating from the isotope (277)112 were observed in the Pb-201(Zn-70, n) reaction. Both chains consisted of four consecutive alpha decays followed by a spontaneous fission. The results provide a confirmation of the production and decay of the isotope (277)112 reported by a research group at Gesellschaft fur Schwerionenforschung (GSI), Germany, produced via the same reaction by using a velocity filter. Tow decay chains, both consisted of four consecutive alpha decays followed by a spontaneous fission, were observed also in the reaction Bi-209(Zn-70, n). Those are assigned to be the convincing candidate events of the decays of the isotope of the 113th element (278)113, and its daughter nuclei, (274)Rg, (270)Mt, (266)Bh, and (262)Db.

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  • α decay ofCm238and the new isotopeCm237 Reviewed

    M. Asai, K. Tsukada, S. Ichikawa, M. Sakama, H. Haba, I. Nishinaka, Y. Nagame, S. Goto, Y. Kojima, Y. Oura, M. Shibata

    Physical Review C   73 ( 6 )   67301 - 1   2006.6

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    DOI: 10.1103/physrevc.73.067301

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  • Chemical studies of the transactinide elements at JAEA Reviewed

    Y. Nagame, K. Akiyama, M. Asai, S. Goto, H. Haba, M. Hirata, Y. Ishii, I. Nishinaka, H. Tome, A. Toyoshima, K. Tsukada

    NUCLEAR PHYSICS TRENDS   865   165 - +   2006

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    Chemical properties of the transactinide element, rutherfordium (Rf), produced in the reaction Cm-248(O-18, 5n) have been studied based on an atom-at-a-time scale. Ion-exchange chromatographic experiments on Rf together with the lighter homologues in the periodic table of the elements, group-4 elements Zr and Hf, in hydrofluoric acid solutions have been conducted with a rapid chemical separation apparatus. From the systematic study of the anion-exchange behavior of Rf, we have observed unexpected chemical behavior of Rf; the fluoride complex formation of Rf is significantly different from those of the homologues. Characteristics of the complexing strength of the Rf fluoride are briefly discussed by comparing with those of the homologues and with theoretical predictions by relativistic molecular density-functional calculations.

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  • Experiments on synthesis of the heaviest elements at RIKEN Reviewed

    K. Morimoto, K. Morita, D. Kaji, A. Yoneda, H. Haba, T. Akiyama, N. Sato, S. Goto, E. Ideguchi, K. Katori, H. Kikunaga, H. Koura, H. Kudo, T. Ohnishi, A. Ozawa, T. Suda, K. Sueki, F. Tokanai, T. Yamaguchi, A. Yoshida

    FUSION06: REACTION MECHANISMS AND NUCLEAR STRUCTURE AT THE COULOMB BARRIER   853   253 - +   2006

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    In the Institute of Physical and Chemical Research (RIKEN), using high intensity heavy ion beams from the RIKEN Linear Accelerator, productions and decays of isotopes of the heaviest elements have been investigated by using the gas-filled recoil separator, GARIS. The isotopes studied were (HS)-H-265, (DS)-D-271, (272)Rg, (277)112, and (278)113, respectively. Based on the observed decay chains consisting of consecutive alpha decays connected to the previously known alpha decays or spontaneous fissions, assignments of the initially produced isotopes were done. Our data with the atomic number from 108 to 112, agree well with the data previously taken. The production cross section of the isotope (278)113 of the 113th element have reached around 32 fb which shows the simple decrease of the cross section with the increase of the atomic number. The isotopes were produced, for the first time in the In evaporation channel from heavy-ion induced fusion reaction.

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  • Experiments on synthesis of the heaviest elements at RIKEN Reviewed

    K. Morimoto, K. Morita, D. Kaji, A. Yoneda, H. Haba, T. Akiyama, N. Sato, S. Goto, E. Ideguchi, K. Katori, H. Kikunaga, H. Koura, H. Kudo, T. Ohnishi, A. Ozawa, T. Suda, K. Sueki, F. Tokanai, T. Yamaguchi, A. Yoshida

    NUCLEAR PHYSICS TRENDS   865   159 - +   2006

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    In the Institute of Physical and Chemical Research (RIKEN), using high intensity heavy ion beams from the RIKEN Linear Accelerator, productions and decays of isotopes of the heaviest elements have been investigated by using the gas-filled recoil separator, GARIS. The isotopes studied were (265)Hs, (271)Ds, (272)Rg, (271)112, and (278)113, respectively. Based on the observed decay chains consisting of consecutive alpha decays connected to the previously known alpha decays or spontaneous fissions, assignments of the initially produced isotopes were done. Our data with the atomic number from 108 to 112, agree well with the data previously taken. The production cross section of the isotope (278)113 of the 113th element have reached around 32 fb which shows the simple decrease of the cross section with the increase of the atomic number. The isotopes were produced, for the first time in the In evaporation channel from heavy-ion induced fusion reaction.

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  • Chemical studies on rutherfordium (Rf) at JAERI Reviewed

    Y Nagame, K Tsukada, M Asai, A Toyoshima, K Akiyama, Y Ishii, T Kaneko-Sato, M Hirata, Nishinaka, I, S Ichikawa, H Haba, S Enomoto, K Matsuo, D Saikal, Y Kitamoto, H Hasegawa, Y Tani, W Sato, A Shmohara, M Ito, J Saito, S Goto, H Kudo, H Kikunaga, N Kinoshita, A Yokoyama, K Sueki, Y Oura, H Nakahara, M Sakama, M Schadel, W Bruchle, JV Kratz

    Radiochimica Acta   93 ( 9-10 )   519 - 526   2005.9

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    <title>Summary</title>Chemical studies on element 104, rutherfordium (Rf), at JAERI (Japan Atomic Energy Research Institute) are reviewed. The transactinide nuclide<sup>261</sup>Rf has been produced in the reaction<sup>248</sup>Cm(<sup>18</sup>O, 5<italic>n</italic>) at the JAERI tandem accelerator with the production cross section of about 13 nb. On-line anion-exchange experiments on Rf together with the lighter homologues, group-4 elements Zr and Hf, in acidic solutions have been conducted with a rapid ion-exchange separation apparatus. From the systematic study of the anion-exchange behavior of Rf, it has been found that the properties of Rf in HCl and HNO<sub>3</sub>solutions are quite similar to those of Zr and Hf, definitely confirming that Rf is a member of the group-4 elements. However, we have observed an unexpected chemical behavior of Rf in HF solutions; the fluoride complex formation of Rf is significantly different from those of the homologues. Prospects of extending chemical studies on transactinide elements in the near future at JAERI are briefly considered.

    DOI: 10.1524/ract.2005.93.9-10.519

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  • Proton-neutron configurations in 236g, mAm and its EC-decay daughter 236Pu Reviewed

    M. Asai, M. Sakama, K. Tsukada, S. Ichikawa, H. Haba, I. Nishinaka, Y. Nagame, S. Goto, Y. Kojima, Y. Oura, H. Nakahara, M. Shibata, K. Kawade

    The European Physical Journal A   23 ( 3 )   395 - 400   2005.3

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    DOI: 10.1140/epja/i2004-10096-6

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  • Simultaneous Observation of Volatility of Zr, Hf, and Rf Chlorides Reviewed

    Tetsuya Kaneko Sato, Kazuaki Tsukada, Masato Asai, Kazuhiko Akiyama, Hiromitsu Haba, Atsushi Toyoshima, Sawako Ono, Toshiyuki Hirai, Shin'ichi Goto, Shinichi Ichikawa, Yuichiro Nagame, Hisaaki Kudo

    Journal of Nuclear and Radiochemical Sciences   6 ( 2 )   N1 - N3   2005

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    <SUP>85</SUP>Zr, <SUP>169</SUP>Hf, and <SUP>261</SUP>Rf were produced simultaneously from <SUP>nat</SUP>Ge (<SUP>18</SUP>O, xn), <SUP>nat</SUP>Gd (<SUP>18</SUP>O, xn), and <SUP>248</SUP>Cm (<SUP>18</SUP>O, 5n) reactions, respectively, and the volatility of their chlorides was examined using an isothermal gas chromatographic system. The observed gas chromatogram indicated that ZrCl<SUB>4</SUB>, HfCl<SUB>4</SUB>, and RfCl<SUB>4</SUB> had almost similar volatility.

    DOI: 10.14494/jnrs2000.6.2_n1

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  • Atom-at-a-time chemistry of the transactinide element, rutherfordium (element 104) towards experimental verification of relativistic effects in chemical properties Reviewed

    Y Nagame, K Tsukada, M Asai, A Toyoshima, K Akiyama, Y Ishii, Nishinaka, I, TK Sato, M Hirata, T Ichikawa, H Haba, S Goto, M Sakama

    Recent Achievements and Perspectives in Nuclear Physics   295 - 306   2005

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    Chemical properties of the transactinide element, rutherfordium (Rf), produced in the reaction Cm-248(O-18,5n) have been studied at an atom-at-a-time scale. Ion-exchange experiments of Rf together with the lighter homologues in the periodic table of the elements, group-4 elements Zr and Hf, in hydrofluoric acid solutions have been conducted with a rapid ion-exchange separation apparatus. From the systematic study of the anion-exchange behavior of Rf, we have observed an unexpected chemical behavior of Rf; the fluoride complex formation of Rf is significantly different from those of the homologues. Characteristics of the complexing strength of the Rf fluoride are briefly discussed by comparing with those of Zr and Hf and also with theoretical predictions by relativistic molecular density-functional calculations.

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  • EC and α decays of 235Am Reviewed

    M. Asai, M. Sakama, K. Tsukada, S. Ichikawa, H. Haba, I. Nishinaka, Y. Nagame, S. Goto, Y. Kojima, Y. Oura, H. Nakahara, M. Shibata, K. Kawade

    The European Physical Journal A   22 ( 3 )   411 - 416   2004.12

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    DOI: 10.1140/epja/i2004-10044-6

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  • Experiment on the Synthesis of Element 113 in the Reaction209Bi(70Zn,n)278113 Reviewed

    Kosuke Morita, Kouji Morimoto, Daiya Kaji, Takahiro Akiyama, Sin-ichi Goto, Hiromitsu Haba, Eiji Ideguchi, Rituparna Kanungo, Kenji Katori, Hiroyuki Koura, Hisaaki Kudo, Tetsuya Ohnishi, Akira Ozawa, Toshimi Suda, Keisuke Sueki, HuShan Xu, Takayuki Yamaguchi, Akira Yoneda, Atsushi Yoshida, YuLiang Zhao

    Journal of the Physical Society of Japan   73 ( 10 )   2593 - 2596   2004.10

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    The convincing candidate event of the isotope of the 113th element, 278113, and its daughter nuclei, 274111 and 270Mt, were observed, for the first time, in the $\text{$^{209}$Bi} + \text{$^{70}$Zn}$ reaction at a beam energy of 349.0 MeV with a total dose of $1.7 \times 10^{19}$. Alpha decay energies and decay times of the candidates, 278113, 274111, and 270Mt, were ($11.68 \pm 0.04$ MeV, 0.344 ms), ($11.15 \pm 0.07$ MeV, 9.26 ms), and ($10.03 \pm 0.07$ MeV, 7.16 ms), respectively. The production cross section of the isotope was deduced to be 55$^{+150}_{-45}$ fb (10-39 cm2).

    DOI: 10.1143/jpsj.73.2593

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  • Production and Decay Properties of272111 and its Daughter Nuclei Reviewed

    K. Morita, K. Morimoto, D. Kaji, H. Haba, E. Ideguchi, J. C. Peter, R. Kanungo, K. Katori, H. Koura, H. Kudo, T. Ohnishi, A. Ozawa, T. Suda, K. Sueki, I. Tanihata, H. Xu, A. V. Yeremin, A. Yoneda, A. Yoshida, Y.-L. Zhao, T. Zheng, S. Goto, F. Tokanai

    Journal of the Physical Society of Japan   73 ( 7 )   1738 - 1744   2004.7

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    The production and decay of $^{272}111$ has been investigated using a gas-filled recoil ion separator in irradiations of 209Bi targets with 64Ni beam at 320, 323 and 326 MeV. We have observed 14 $\alpha$-decay chains in total, that can be assigned, on the basis of their time correlations, to subsequent decays from $^{272}111$ produced in the 209Bi(64Ni,1n) reaction. The present result is the first clear confirmation for the discovery of $^{272}111$ and its $\alpha$-decay products, 264Bh and 268Mt, reported previously by a GSI group. New information on their half-lives and decay energies as well as the excitation function is presented.

    DOI: 10.1143/jpsj.73.1738

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  • Status of super heavy element research using GARIS at RIKEN Reviewed

    K Morimoto, K Morita, D Kaji, S Goto, H Haba, E Ideguchi, R Kanungo, K Katori, H Koura, H Kudo, T Ohnishi, A Ozawa, JC Peter, T Suda, K Sueki, Tanihata, I, F Tokanai, H Xu, AV Yeremin, A Yoneda, A Yoshida, TL Zhao, T Zheng

    NUCLEAR PHYSICS A   738   129 - 135   2004.6

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    A gas-filled recoil separator GARIS for heavy element research was installed at an experimental hall of the RIKEN linear Accelerator (RILAC) facility. One of the interesting applications of the separator is the discovery of nuclei of superheavy elements whose atomic number are grater then 110. We performed experiments to study productions and decays of heavy nuclei, (271)Ds and (272)111, which were produced with Pb-208 + Ni-64 --&gt; (271)Ds + n and Bi-209 + Ni-64 --&gt; (272)111 + it reactions. Fourteen atoms of (271)Ds and the same number of (272)111 were detected and identified. Existence of an isomeric state in (271)Ds was confirmed. In the decay chains of (272)111, spontaneous fission decays were observed in decay of (264)Bh and (260)Db.

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  • Status of heavy element research using GARIS at RIKEN Reviewed

    K. Morita, K.K. Morimoto, D. Kaji, S. Goto, H. Haba, E. Ideguchi, R. Kanungo, K. Katori, H. Koura, H. Kudo, T. Ohnishi, A. Ozawa, J.C. Peter, T. Suda, K. Sueki, I. Tanihata, F. Tokanai, H. Xu, A.V. Yeremin, A. Yoneda, A. Yoshida, Y.-L. Zhao, T. Zheng

    Nuclear Physics A   734   101 - 108   2004.4

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    DOI: 10.1016/j.nuclphysa.2004.01.019

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  • Chemical studies of the heaviest elements Reviewed

    Y. Nagame, H. Haba, K. Tsukada, M. Asai, A. Toyoshima, S. Goto, K. Akiyama, T. Kaneko, M. Sakama, M. Hirata, T. Yaita, I. Nishinaka, S. Ichikawa, H. Nakahara

    Nuclear Physics A   734   124 - 135   2004.4

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  • Fluoride Complexation of Element 104, Rutherfordium Reviewed

    Hiromitsu Haba, Kazuaki Tsukada, Masato Asai, Atsushi Toyoshima, Kazuhiko Akiyama, Ichiro Nishinaka, Masaru Hirata, Tsuyoshi Yaita, Shin-ichi Ichikawa, Yuichiro Nagame, Ken-ichiro Yasuda, Yutaka Miyamoto, Tetsuya Kaneko, Shin-ichi Goto, Sawako Ono, Toshiyuki Hirai, Hisaaki Kudo, Mitsuru Shigekawa, Atsushi Shinohara, Yasuji Oura, Hiromichi Nakahara, Keisuke Sueki, Hidetoshi Kikunaga, Norikazu Kinoshita, Naoya Tsuruga, Akihiko Yokoyama, Minoru Sakama, Shuich Enomoto, Matthias Schädel, Willy Brüchle, Jens V. Kratz

    Journal of the American Chemical Society   126 ( 16 )   5219 - 5224   2004.4

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    Fluoride complexation of element 104, rutherfordium (Rf), produced in the (CM)-C-248(O-18,5n)(261)Rf reaction has been studied by anion-exchange chromatography on an atom-at-a-time scale. The anion-exchange chromatographic behavior of Rf was investigated in 1.9-13.9 M hydrofluoric acid together with those of the group-4 elements Zr and Hf produced in the O-18-induced reactions on Ge and Gel targets, respectively. It was found that the adsorption behavior of Rf on anion-exchange resin is quite different from those of Zr and Hf, suggesting the influence of relativistic effects on the fluoride complexation of Rf.

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  • α-decays of neutron-deficient americium isotopes

    M. Sakama, M. Asai, K. Tsukada, S. Ichikawa, I. Nishinaka, Y. Nagame, H. Haba, S. Goto, M. Shibata, K. Kawade, Y. Kojima, Y. Oura, M. Ebihara, H. Nakahara

    Physical Review C   69 ( 1 )   2004.1

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    DOI: 10.1103/physrevc.69.014308

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  • Elution Curve of Rutherfordium (Rf) in Anion-Exchange Chromatography with Hydrofluoric Acid Solution Reviewed

    A. Toyoshima, H. Haba, K. Tsukada, M. Asai, K. Akiyama, I. Nishinaka, Y. Nagame, D. Saika, K. Matsuo, W. Sato, A. Shinohara, H. Ishizu, M. Ito, J. Saito, S. Goto, H. Kudo, H. Kikunaga, N. Kinoshita, C. Kato, A. Yokoyama, K. Sueki

    Journal of Nuclear and Radiochemical Sciences   5 ( 2 )   45 - 48   2004

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    An elution curve of element 104, rutherfordium (Rf), in anion-exchange chromatography has been obtained for the first time on an atom-at-a-time basis. The distribution coefficient in 5.4 M hydrofluoric acid solution has been determined to be 28±6 mL/g from the observed peak volume of the elution curve.

    DOI: 10.14494/jnrs2000.5.45

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  • Study of decays of (271)110 and (272)111 produced with Pb-208(Ni-64,n) and Bi-209(Ni-64,n) reactions Reviewed

    K Morita, K Morimoto, D Kaji, S Goto, H Haba, E Idegichi, R Kanungo, K Katori, H Koura, H Kudo, T Ohnishi, A Ozawa, JC Peter, T Suda, K Sueki, Tanihata, I, F Tokanai, H Xu, AV Yeremin, A Yoneda, A Yoshida, YL Zhao, T Zheng

    TOURS SYMPOSIUM ON NUCLEAR PHYSICS V   13 - 20   2004

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    Production and decay of an isotope (271)110 of the 110th element were studied. The isotope was produced by Pb-208 + Ni-64 --&gt; (271)110 + n reaction. Fourteen cc-decay chains have been assigned to be the decays originating from the isotope (271)110. The excitation function of the production cross section was measured. The results have provided a good confirmation of production and decay of the (271)110 reported by GSI group. The presence of an isomeric state in (271)110 has also been confirmed. Possible isomeric state in (267)Hs has also been presented. The production and decay of (272)111 has been also investigated in irradiations of Bi-209 targets with Ni-64 beam. We have observed 14 a-decay chains in total, that can be assigned, on the basis of their time correlations, to subsequent decays from (272)111.

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  • Characteristics of the asymmetric mass distribution in proton-induced fission of actinides Reviewed

    S. Goto, D. Kaji, I. Nishinaka, Y. Nagame, S. Ichikawa, K. Tsukada, M. Asai, H. Haba, S. Mitsuoka, K. Nishio, M. Sakama, Y. L. Zhao, K. Sueki, K. Tanikawa, K. Takamiya, H. Kudo, H. Nakahara

    Journal of Radioanalytical and Nuclear Chemistry   255 ( 1 )   73 - 76   2003.11

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    DOI: 10.1023/a:1022271529219

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  • Heavy element nuclear chemistry at JAERI

    Y Nagame, M Asai, H Haba, K Tsukada, Nishinaka, I, S Goto, A Toyoshima, K Akiyama, M Sakama, YL Zhao, S Ichikawa, H Nakahara

    PHYSICS OF ATOMIC NUCLEI   66 ( 6 )   1131 - 1136   2003.6

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    The present status of heavy element nuclear chemistry research at JAERI (Japan Atomic Energy Research Institute) is reviewed. Production of the transactinide nuclei (216)Rf and (212)Db via the reactions of Cm-248(O-18,5n) and Cm-248(F-19,5n), respectively, at the JAERI tandem accelerator is reported. Study of the aqueous chemistry of Rf is being carried out with a newly developed rapid ion-exchange separation apparatus. Anion-exchange behavior of Rf in acidic solution is briefly discussed. Recent experimental results on decay studies of neutron-deficient actinide nuclei using the gas-jet coupled JAERI-ISOL are given. We also discuss characteristics of nuclear deformation properties at scission in symmetric and asymmetric fission of actinides. Prospects for studies in the near future are briefly considered. (C) 2003 MAIK "Nauka/Interperiodica".

    DOI: 10.1134/1.1586427

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  • Fragment mass distribution of the239Pu(d,pf)reaction via the superdeformed β-vibrational resonance Reviewed

    K. Nishio, H. Ikezoe, Y. Nagame, S. Mitsuoka, I. Nishinaka, L. Duan, K. Satou, S. Goto, M. Asai, H. Haba, K. Tsukada, N. Shinohara, S. Ichikawa, T. Ohsawa

    Physical Review C   67 ( 1 )   2003.1

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    DOI: 10.1103/physrevc.67.014604

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  • Chemical separation of the unknown isotope 252Bk Reviewed

    T. Maruyama, D. Kaji, T. Kaneko, S. Goto, K. Tsukada, H. Haba, M. Asai, S. Ichikawa, Y. Nagame, H. Kudo

    Journal of Radioanalytical and Nuclear Chemistry   255 ( 2 )   253 - 256   2003

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    DOI: 10.1023/a:1022571813231

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  • Isothermal gas chromatography of chlorides of Zr and Hf as Rf homologs Reviewed

    T. Kaneko, S. Ono, S. Goto, H. Haba, M. Asai, K. Tsukada, Y. Nagame, H. Kudo

    Journal of Radioanalytical and Nuclear Chemistry   255 ( 2 )   381 - 384   2003

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    DOI: 10.1023/a:1022577409113

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  • Thermochromatographic behavior of fission products combined with dipivaloylmethane

    S. Ono, T. Kaneko, S. Goto, H. Kudo

    Journal of Radioanalytical and Nuclear Chemistry   255 ( 3 )   571 - 574   2003

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    DOI: 10.1023/a:1022505104512

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  • Anion exchange behavior of nobelium Reviewed

    A. Toyoshima, K. Tsukada, H. Haba, M. Asai, S. Goto, K. Akiyama, I. Nishinaka, S. Ichikawa, Y. Nagame, A. Shinohara

    Journal of Radioanalytical and Nuclear Chemistry   255 ( 3 )   485 - 487   2003

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    DOI: 10.1023/a:1022520113173

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  • Primary fragment mass-yield distributions for asymmetric fission path of heavy nuclei Reviewed

    Y. L. Zhao, I. Nishinaka, Y. Nagame, K. Tsukada, K. Sueki, S. Goto, M. Tanikawa, H. Nakahara

    Journal of Radioanalytical and Nuclear Chemistry   255 ( 1 )   67 - 72   2003

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    DOI: 10.1023/a:1022219512380

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  • Transactinide nuclear chemistry at JAERI Reviewed

    Y Nagame, H Haba, K Tsukada, M Asai, K Akiyama, M Hirata, Nishinaka, I, S Ichikawa, H Nakahara, S Goto, T Kaneko, H Kudo, A Toyoshima, A Shinohara, A Schadel, JV Kratz, HW Gaggeler, A Turler

    CZECHOSLOVAK JOURNAL OF PHYSICS   53   A299 - A304   2003

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    The present status of transactinide nuclear chemistry research at JAERI (Japan Atomic Energy Research Institute) is reviewed. Successful production of the transactinide nuclei, (261)Rf and (262)Db in the reactions Of Cm-248(O-18,5n) and Cm-248(F-19,5n), respectively, at the JAERI tandem accelerator is reported. Aqueous chemistry of element 104, Rf, is being performed with a newly developed rapid ion-exchange separation apparatus. Anion-exchange behaviour of Rf in acidic solutions is outlined. Research plans for the near future are briefly discussed.

    DOI: 10.1007/s10582-003-0038-3

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  • Most Probable Charge of Fission Products in Proton-Induced Fission of^<238>U and ^<232>Th

    KAJI D., GOTO S., FUJITA M., SHINOZUKA T., FUJIOKA M., KUDO H.

    Journal of Nuclear and Radiochemical Sciences   3 ( 2 )   7 - 12   2002.12

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    The charge distributions of fission products in proton-induced fission of <SUP>238</SUP>U and <SUP>232</SUP>Th were measured in a wide mass range. The most probable charges lay on the proton-rich side in the light fragment region and on the proton-deficient side in the heavy one compared with the unchanged charge distribution hypothesis. This result implies that the charge polarization occurs in the fission process. The charge polarization was examined with respect to the ground-state Q values. The estimations by the Q values fairly well reproduced the experimental most probable charges. These results suggest that the fission path to the most favorable charge division may go through the most energetically favorable path at scission point.

    DOI: 10.14494/jnrs2000.3.2_7

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  • Nuclear Decay Properties of the Neutron-Deficient Actinides Reviewed

    Minoru Sakama, Kazuaki Tsukada, Masato Asai, Shin-ichi Ichikawa, Hiromitsu Haba, Shin-ichi Goto, Ichiro Nishinaka, Yuichiro Nagame, Yasuji Oura, Yasuaki Kojima, Akihiko Osa, Michihiro Shibata, Kiyoshi Kawade, Mitsuru Ebihara, Hiromichi Nakahara

    Journal of Nuclear Science and Technology   39 ( sup3 )   34 - 37   2002.11

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    DOI: 10.1080/00223131.2002.10875403

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  • Measurements of EC and WeakαDecays of Neutron-deficient Transuranium Isotopes Reviewed

    Masato Asai, Minora Sakama, Kazuaki Tsukada, Shin-ichi Ichikawa, Hiromitsu Haba, Ichiro Nishinaka, Yuichiro Nagame, Shin-ichi Goto, Yasuaki Kojima, Yasuji Oura, Hiromichi Nakahara, Michihiro Shibata, Kiyoshi Kawade

    Journal of Nuclear Science and Technology   39 ( sup2 )   474 - 477   2002.8

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    DOI: 10.1080/00223131.2002.10875143

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  • Production Cross Sections of 261Rf and 262Db in Bombardments of 248Cm with 18O and 19F Ions Reviewed

    Y. Nagame, M. Asai, H. Haba, S. Goto, K. Tsukada, I. Nishinaka, K. Nishio, S. Ichikawa, A. Toyoshima, K. Akiyama, H. Nakahara, M. Sakama, M. Schaedel, J. V. Kratz, H. W. Gaeggeler, A. Tuerler

    Journal of Nuclear and Radiochemical Sciences   3 ( 1 )   85 - 88   2002

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    The transactinide nuclei, <SUP>261</SUP>Rf and <SUP>262</SUP>Db, have been produced in the <SUP>248</SUP>Cm (<SUP>18</SUP>O, 5n) reaction at beam energies of 91, 94, and 99 MeV, and in the <SUP>248</SUP>Cm (<SUP>19</SUP>F, 5n) reaction at 106 MeV, respectively. The production cross sections are evaluated from the mother-daughter correlations of α energies between <SUP>261</SUP>Rf and <SUP>257</SUP>No, and <SUP>262</SUP>Db and <SUP>258</SUP>Lr. The maximum cross section of the <SUP>248</SUP>Cm (<SUP>18</SUP>O, 5n) reaction is measured to be 13±3 nb at around 94 MeV, while the production cross section of <SUP>262</SUP>Db in <SUP>248</SUP>Cm (<SUP>19</SUP>F, 5n) is 1.3±0.4 nb at 106 MeV.

    DOI: 10.14494/jnrs2000.3.85

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  • Anion-exchange Behavior of Rf in HCl and HNO3 Solutions Reviewed

    H. Haba, K. Tsukada, M. Asai, S. Goto, A. Toyoshima, I. Nishinaka, K. Akiyama, M. Hirata, S. Ichikawa, Y. Nagame, Y. Shoji, M. Shigekawa, T. Koike, M. Iwasaki, A. Shinohara, T. Kaneko, T. Maruyama, S. Ono, H. Kudo, Y. Oura, K. Sueki, H. Nakahara, M. Sakama, A. Yokoyama, J. V. Kratz, M. Schaedel, W. Bruechle

    Journal of Nuclear and Radiochemical Sciences   3 ( 1 )   143 - 146   2002

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    A short review is given on our current anion-exchange studies of element 104, rutherfordium (Rf), in HCl and HNO<SUB>3</SUB> solutions. The distribution coefficients of the Rf homologues Zr, Hf, and Th (IV), and Pu (IV) on an anion-exchange resin were measured in 1.0-11.5 M HCl and 1.1-13.1 M HNO<SUB>3</SUB> with a batch method using the radiotracers <SUP>88</SUP>Zr, <SUP>175</SUP>Hf, <SUP>234</SUP>Th, and <SUP>237</SUP>Pu. In experiments for the short-lived <SUP>261</SUP>Rf, the isotopes <SUP>85</SUP>Zr, <SUP>169</SUP>Hf, and <SUP>169</SUP>Rf were produced in the <SUP>18</SUP>O-induced reactions on <SUP>nat</SUP>Ge, <SUP>248</SUP>Gd, and <SUP>248</SUP>Cm targets, respectively, and their anion-exchange behavior in 4.0-11.5 M HCl and 8.0 M HNO<SUB>3</SUB> was investigated using the Automated Ion-exchange separation apparatus coupled with the Detection system for Alpha spectroscopy (AIDA). In the HCl system, the percent adsorption of Rf on the anion-exchange resin increases steeply with increasing HCl concentration from 7.0 M to 11.5 M. This adsorption behavior is similar to that of the group-4 elements Zr and Hf, and is quite different from that of the pseudo-homologue Th (IV). The percent adsorption decreases in the order Rf>Zr>Hf. In the HNO<SUB>3</SUB> system, Rf behaves like Zr and Hf in 8.0 M HNO<SUB>3</SUB> but not like Pu (IV) and Th (IV), implying the formation of cationic or neutral species.

    DOI: 10.14494/jnrs2000.3.143

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  • Status and Prospects of Heavy Element Nuclear Chemistry Research at JAERI Reviewed

    Y. Nagame, M. Asai, H. Haba, K. Tsukada, S. Goto, M. Sakama, I. Nishinaka, A. Toyoshima, K. Akiyama, S. Ichikawa

    Journal of Nuclear and Radiochemical Sciences   3 ( 1 )   129 - 132   2002

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    The present status of heavy element nuclear chemistry research at JAERI (Japan Atomic Energy Research Institute) is reviewed. Successful production of the transactinide nuclei, <SUP>261</SUP>Rf and <SUP>262</SUP>Db via the reactions of <SUP>248</SUP>Cm (<SUP>18</SUP>O, 5n) and <SUP>248</SUP>Cm (<SUP>19</SUP>F, 5n), respectively at the JAERI tandem accelerator is presented. Aqueous chemistry of Rf is being carried out with a newly developed rapid ion-exchange separation apparatus. Anion-exchange behavior of Rf in HCl solution is shortly discussed. Recent experimental results on decay studies of neutron-deficient actinide nuclei using the gas-jet coupled JAERI-ISOL are also given. Prospects for the near future studies are briefly considered.

    DOI: 10.14494/jnrs2000.3.129

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  • Rapid Chemical Separation for Bk Reviewed

    T. Maruyama, D. Kaji, T. Kaneko, S. Goto, K. Tsukada, H. Haba, M. Asai, S. Ichikawa, Y. Nagame, H. Kudo

    Journal of Nuclear and Radiochemical Sciences   3 ( 1 )   155 - 158   2002

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    An anion exchange in mineral acid and methanol system was examined in view of rapid chemical separation. An elution behavior of Bk in hydrochloric acid-methanol system was obtained using <SUP>250</SUP>Bk. An elution behavior of Bk in nitric acid-methanol system was predicted from the relationship between an elution position and an ionic radius . The separation was completed for nitric acid-methanol system and for hydrochloric-methanol system within 40 and 25 min, respectively.

    DOI: 10.14494/jnrs2000.3.155

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  • Fission Characteristics of Individual Deformation Paths in Heavy Elements Reviewed

    Y. L. Zhao, I. Nishinaka, Y. Nagame, K. Tsukada, K. Sueki, M. Tanikawa, S. Goto, H. Nakahara

    Journal of Nuclear and Radiochemical Sciences   3 ( 1 )   103 - 107   2002

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    The deformation properties of heavy nuclei undergoing the individual fission paths are studied. To understand the nuclear mass division process at low energy, fission events for the symmetric and asymmetric fission paths are analyzed from the overall fission events. The fragment mass-yield distributions for the symmetric and asymmetric fission paths in the fission processes of <SUP>210</SUP>Po, <SUP>227</SUP>Ac, <SUP>233</SUP>Pa, <SUP>249</SUP>Bk, and <SUP>259</SUP>Md are systematically studied. Fission characteristics including the deformation of the fissioning nucleus at the scission configuration, the fragment massyield distributions, and the total kinetic energy release for individual fission paths are presented.

    DOI: 10.14494/jnrs2000.3.103

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  • Decay Studies of Neutron-deficient Am, Cm, and Bk Nuclei Using an On-line Isotope Separator Reviewed

    M. Asai, M. Sakama, K. Tsukada, S. Ichikawa, H. Haba, I. Nishinaka, Y. Nagame, S. Goto, K. Akiyama, A. Toyoshima, Y. Kojima, Y. Oura, H. Nakahara, M. Shibata, K. Kawade

    Journal of Nuclear and Radiochemical Sciences   3 ( 1 )   187 - 190   2002

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    The EC and α decays of neutron-deficient Am and Cm nuclei have been studied using a gas-jet coupled on-line isotope separator. Decay schemes of the EC decay of <SUP>235, 236</SUP>Am have been constructed, and weak α decays of <SUP>233, 235, 236</SUP>Am and <SUP>237, 238</SUP>Cm have been observed. The efficiency of the on-line mass separation of Bk nuclei was measured to be ∼1%. The Q<SUB>α</SUB> values, α-decay partial half-lives, and proton-neutron configurations are discussed.

    DOI: 10.14494/jnrs2000.3.187

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  • Characteristics of two fission modes Reviewed

    Y. Nagame, Y.L. Zhao, I. Nishinaka, S. Goto, D. Kaji, M. Tanikawa, K. Tsukada, M. Asai, H. Haba, M. Sakama

    Radiochimica Acta   89 ( 11-12 )   681 - 688   2001.11

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    Characteristics of nuclear deformation properties at scission of two fission modes, symmetric and asymmetric, are reviewed. Existence of two kinds of scission configurations associated with the symmetric and asymmetric fission modes is pointed out: elongated and compact configurations. Each symmetric and asymmetric scission property is discussed in terms of shape elongation evaluated from fragment total kinetic energy (TKE). Fragment deformation at scission is also discussed based on neutron multiplicity data. From the systematic study of the scission properties in a wide range of actinide fission, the bimodal fission observed in spontaneous fission (SF) of the heavy actinides is interpreted as the result of the presence of the two fission paths of the ordinary asymmetric mode and a strongly shell-influenced symmetric one. The correlation between the fragment shell structures and the asymmetric mass-yield curves is described.

    DOI: 10.1524/ract.2001.89.11-12.681

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  • Startup of transactinide chemistry in JAERI

    H. Haba, K. Tsukada, M. Asai, I. Nishinaka, M. Sakama, S. Goto, M. Hirata, S. Ichikawa, Y. Nagame, T. Kaneko

    Radiochimica Acta   89 ( 11-12 )   733 - 736   2001.11

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    The transactinide nuclides<sup>261</sup>Rf and<sup>262</sup>Db have been successfully produced in the<sup>248</sup>Cm(<sup>18</sup>O,5<italic>n</italic>) reaction at 99 MeV and in the<sup>248</sup>Cm(<sup>19</sup>F,5<italic>n</italic>) reaction at 100, 103, and 106 MeV, respectively, at the JAERI tandem accelerator. The on-line ion exchange experiments with an automated fast and repetitive liquid chromatography separation system were performed in the HNO<sub>3</sub>/HF system using Rf homologues<sup>89m</sup>Zr and<sup>167,165</sup>Hf produced in the<sup>89</sup>Y(<italic>p,n</italic>) and<sup>152</sup>Gd(<sup>18</sup>O,<italic>xn</italic>) reactions, respectively. The radiotracers<sup>88</sup>Zr,<sup>175</sup>Hf, and<sup>234</sup>Th were also prepared and the distribution coefficients on ion exchange resins were measured systematically in 1-11 M HCl and 1-14 M HNO<sub>3</sub>with the batch method. It was found that anion exchange experiments of Rf in 8 M HNO<sub>3</sub>and 9 M HCl provided information useful to extract the ionic radius of Rf and to verify the influence of relativistic effects.

    DOI: 10.1524/ract.2001.89.11-12.733

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  • Symmetric and asymmetric scission properties Reviewed

    Y. Nagame, Y. L. Zhao, I. Nishinaka, S. Goto, M. Tanikawa, K. Tsukada, M. Asai, H. Haba, M. Sakama, S. Ichikawa, K. Sueki, H. Nakahara

    Acta Phys. Hung. N. S.   13   121   2001

  • Spectroscopic studies of mass-separated heavy nuclei Reviewed

    M Asai, M Sakama, K Tsukada, S Ichikawa, H Haba, Nishinaka, I, Y Nagame, S Goto, Y Kojima, Y Oura, H Nakahara, M Shibata, K Kawade

    4TH SYMPOSIUM ON NUCLEAR PHYSICS   561   358 - 367   2001

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    EC and alpha decays of neutron-deficient nuclei Am233-236 have been studied using: a gas-jet coupled on-line isotope separator. A proton orbital of the ground state of Am-235 and neutron orbitals in Pu-235 have been estimated from a decay scheme of 235Am. The 5(-) ground state and the 1(-) EC decaying isomer in Am-236 and the configuration of two-quasiparticle states in Pu-236 have been established. Q alpha values of Am-233,Am-235,Am-236 have been determined from measured alpha -particle energies. It was found that evaluated Q alpha values were systematically overestimated by 100-200 keV in neutron-deficient Am nuclei.

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  • New isotope 233Am Reviewed

    M. Sakama, K. Tsukada, M. Asai, S. Ichikawa, H. Haba, S. Goto, Y. Oura, I. Nishinaka, Y. Nagame, M. Shibata, Y. Kojima, K. Kawade, M. Ebihara, H. Nakahara

    The European Physical Journal A   9 ( 3 )   303 - 305   2000.12

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    DOI: 10.1007/s100500070013

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  • Two deformation paths in fission of light actinides Reviewed

    Y. Nagame, I. Nishinaka, Y. L. Zhao, K. Tsukada, S. Ichikawa, Z. Qin, H. Ikezoe, Y. Oura, K. Sueki, H. Nakahara, M. Tanikawa, T. Ohtsuki, S. Goto, H. Kudo, Y. Hamajima, K. Takamiya, K. Nakanishi, H. Baba

    Journal of Radioanalytical and Nuclear Chemistry   239 ( 1 )   97 - 101   1999.1

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    DOI: 10.1007/bf02349537

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  • Rapid ion-exchange separation apparatus AIDA for heavy element chemistry

    Y. Nagame, K. Akiyama, M. Asai, S. Goto, H. Haba, Y. Ishii, Y. Kasamatsu, I. Nishinaka, H. Toume, A. Toyoshima, K. Tsukada

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   233   2007.3

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  • <sup>208</sup>Pb+<sup>70</sup>Zn反応を用いた(超)重元素探索

    加治大哉, 森田浩介, 秋山隆宏, 後藤真一, 井手口栄治, 小浦寛之, 小沢顕, XU H., ZHAO Y.-L.

    日本放射化学会年会・放射化学討論会研究発表要旨集   2004-48th   2004

  • Systematic Study of Fission Properties in Proton-Induced Fission of Uranium Isotopes.

    後藤真一, 西中一朗, 阪間稔, 末木啓介, 中原弘道, 谷川勝至, 高宮幸一, 加治大哉, 浜島靖典

    日本放射化学会年会・放射化学討論会講演要旨集   2000-44th   2000

  • Angular Momentum of Fission Fragment in Proton-Induced Fission of Light Actinoides.

    後藤真一, 加治大哉, 工藤久昭, 藤田正広, 篠塚勉, 藤岡学

    日本放射化学会年会・放射化学討論会講演要旨集   43rd   1999

  • Nuclear charge distribution of fission products in the system of proton-induced fission of <sup>232</sup>Th.

    加治大哉, 後藤真一, 工藤久昭, 藤田正弘, 篠塚勉, 藤岡学

    放射化学討論会講演予稿集   42nd   1998

  • Efficiencies of coaxial type HP-Ge detector of large volume and semi-planar type HP-Ge detector.

    加治大哉, 後藤真一, 工藤久昭

    放射化学討論会講演予稿集   40th   1996

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Presentations

  • 205Tl(g,pn)反応を用いた無担体203Hgトレーサの製造

    髙橋佳暉, 後藤真一, 菊永英寿, 高橋健

    日本放射化学会第63回討論会(2019)  2019.9 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Poster presentation  

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  • 超重元素塩化物の系統的気相化学研究に向けた15族元素Sbの塩化物の揮発挙動

    井上浩樹, 後藤真一

    日本放射化学会第63回討論会(2019)  2019.9 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Poster presentation  

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  • Rfの同族元素Zr,Hfの塩化物に対する等温ガスクロマトグラフィにおける酸素の影響

    白井香里, 後藤真一, 工藤久昭

    日本放射化学会第63回討論会(2019)  2019.9 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Poster presentation  

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  • 超重元素原子ビーム生成に向けた高温ノズル型低速原子ビーム源の開発

    富塚知博, 佐藤哲也, 伊藤由太, 床井健運, 鈴木颯人, 浅井雅人, 塚田和明, 後藤真一, 永目諭一郎

    日本放射化学会第63回討論会(2019)  2019.9 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Isothermal gas chromatography of chloride of Zr and Hf at off-line experiment for the gas-phase investigation of Rf

    SHIRAI, Kaori, GOTO, Shin'ichi, OOE, Kazuhiro, KUDO, Hisaaki

    6th International Conference on the Chemistry and Physics of the Transactinide Elements (TAN19)  2019.8 

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    Event date: 2019.8

    Language:English   Presentation type:Poster presentation  

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  • Off-line experiment of gas chromatography for ZrCl4 and HfCl4 using a chlorinated column

    K. Shirai, S. Goto, K. Ooe, H. Kudo

    9th Workshop on the Chemistry of the Heaviest Element (CHE9)  2017.10 

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    Event date: 2017.10

    Language:English   Presentation type:Oral presentation (general)  

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  • Adsorption of Lawrencium (Z=103) on a Tantalum Surface

    T. Tomitsuka, Y. Kaneya, T. K. Sato, M. Asai, K. Tsukada, A. Toyoshima, A. Mitsukai, A. Osa, K. Nishio, Y. Nagame, K. Ooe, M. Sakama, S. Miyashita, M. Shibata, Y. Kasamatsu, R. Eichler, C. E. Duellmann, N. Trautmann, J. V. Kratz, M. Schaedel

    6th Asia-Pacific Symposium on Radiochemistry (APSORC17)  2017.9 

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    Event date: 2017.9

    Language:English   Presentation type:Oral presentation (general)  

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  • Influence of Surface Condition of Quartz Column for Gas Chromatoraphic Behaviors of ZrCl4 and HfCl4

    K. Shirai, S. Goto, K. Ooe, H. Kudo

    6th Asia-Pacific Symposium on Radiochemistry (APSORC17)  2017.9 

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    Event date: 2017.9

    Language:English   Presentation type:Oral presentation (general)  

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  • Gas chromatographic behaviors of ZrCl and HfCl in macro- and tracerscale

    GOTO, Shinichi, OSHIMI, Yoshinari, SHIRAI, Kaori, Ooe, Kazuhiro, Kudo, Hisaaki

    2015 International Chemical Congress of Pacific Basin Societies (PACIFICHEM 2015)  2015.12 

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    Event date: 2015.12

    Language:English   Presentation type:Poster presentation  

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  • Excitation functions of Db isotopes produced in 248Cm(19F, xn) reaction

    M. Murakami, S. Goto, K. Ooe, D. Sato, S. Tsuto, N. Goto, K. Koyama, R. Aono, H. Haba, M. Huang, H. Kudo

    5th International Conference on the Chemistry and Physics of the Transactinide Elements (TAN15)  2015.5 

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    Event date: 2015.5

    Language:English   Presentation type:Poster presentation  

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  • Off-line experiment of isothermal chromatography for Zr and Hf tetrachloride in macro- and tracer-scale

    S. Goto, Y. Oshimi, K. Shirai, K. Ooe, H. Kudo

    5th International Conference on the Chemistry and Physics of the Transactinide Elements (TAN15)  2015 

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    Event date: 2015.5

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  • Gas phase chemistry of the volatile chloride compound of Hf isotopes

    S. Goto, Y. Oshimi, T. Tomitsuka, M. Murakami, S. Tsuto, Y. Yatsu, K. Ooe, T. K. Sato, K. Tsukada, M. Asai, A. Toyoshima, N. Miyashita, Y. Kaneya, Y. Nagame, H. Kudo

    Eighth Workshop on the Chemistry of the Heaviest Elements (CHE8)  2013.9 

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    Event date: 2013.9

    Language:English   Presentation type:Poster presentation  

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  • Decay properties of 261Rf and 262Rf Invited

    Shin-ichi Goto, Masashi Murakami, Hirohumi Murayama, Hisaaki Kudo, Daiya Kaji, Koji Morimoto, Hiromitsu Haba, Yoshitaka Kasamatsu, Yuki Kudo, Kosuke Morita

    2010 International Chemical Congress of Pacific Basin Societies (PACIFICHEM 2010)  2010.12 

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    Event date: 2010.12

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • Gas chromatographic behavior of chloride compounds of group-4 elements

    Hirofumi Murayama, Masashi Murakami, Shin'ichi Goto, Hisaaki Kudo, Kazuaki Tsukada, Masato Asai, Atsushi Toyoshima, Tetsuya K. Sato, Yuichiro Nagame

    2010 International Chemical Congress of Pacific Basin Societies (PACIFICHEM 2010)  2010.12 

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    Event date: 2010.12

    Language:English   Presentation type:Poster presentation  

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Research Projects

  • High-precision verification method for probability of photo- and fast-neutron nuclear reactions and selection of nuclear reactions for large-scale RI production

    Grant number:22H00123  2022.4 - 2026.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)

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    Grant amount:\43420000 ( Direct Cost: \33400000 、 Indirect Cost:\10020000 )

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  • Superheavy Element Atomic Science Opened-up by the First Ionization Potential Measurements of Element 113, Nihonium

    Grant number:18KK0086  2018.10 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))  Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

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    Grant amount:\17680000 ( Direct Cost: \13600000 、 Indirect Cost:\4080000 )

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  • Measurement of adsorption enthalpy of rutherfordium chloride and application for group 12-15 elements

    Grant number:18K11917  2018.4 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

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    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

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  • Gas-phase chemistry of Rf and Db

    Grant number:25390122  2013.4 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    GOTO Shin-ichi, KAJI Daiya, MORIMOTO Koji, KUDO Hisaaki, OOE Kazuhiro, MURAKAMI Masashi, OSHIMI Yoshinari, ASAI Takahiro, NAMBA Yu, SHIRAI Kaori

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    Grant amount:\5200000 ( Direct Cost: \4000000 、 Indirect Cost:\1200000 )

    In order to investigate the chemical property of 104th element, rutherfordium (Rf), and 105th element, dubnium (Db), which are superheavy elements, the isothermal gas chromatography experiment of their chloride or oxychloride was planned. However, it was found that the behaviors of passing an isothermal column for zirconium (Zr) and hafnium (Hf) chlorides which are homologue of Rf were different in macro- and tracer-scale. This clear difference by the number of molecules is the first result in our field. Then, the experiments of Rf and Db were shelved, absorption enthalpies to the quartz of the zirconium and hafnium chlorides in the tracer-scale were measured, and we succeeded in derivation of the exact values for the first time.

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  • アクチノイド核分裂における核分裂片電荷測定装置の開発と電荷分割機構に関する研究

    Grant number:15750046  2003 - 2005

    日本学術振興会  科学研究費助成事業 若手研究(B)  若手研究(B)

    後藤 真一

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    Grant amount:\2800000 ( Direct Cost: \2800000 )

    本研究の目的は,核分裂によって生成する核分裂片の電荷(原子番号)を精度よく測定するための検出器の開発である.今年度は,これまでの研究成果を基に,検出器の基本性能のチェックと,更なる性能の向上を目指し研究を行った.
    核分裂片の電荷測定の基本的な原理は,核分裂片が気体中を通過する際に,ある通過距離で失った運動エネルギーを精密に測定することである.そのためには,比較的低い圧力の気体中で長距離を飛行させることが求められるが,核分裂片の運動エネルギーはおそよ100MeVであるので,現実的な検出器の大きさを考えると,イソブタンを100torrの圧力で充填せするのが限界であった.また,検出効率向上のために検出器の開口率を上げようとすると,電極間距離が大きくなり,高電圧の印加が求められるため,いかにして放電を抑えて高電圧を印加するかが課題であった.
    これらの問題に対して,放電しにくい構造に検出器のデザインを変更するとともに,アノードとカソードへの印加電圧とエネルギー分解能の関係を詳細に調査した.
    アノードへはプリアンプの制限から+1kVまで印加可能であり,アノード・グリッドの電極間距離が1cmであるため,カソード・グリッド間は-1kV/cm以下の電場勾配でなくてはならない.カソード・グリッド間の距離をさまざまに変化させ,カソードへの印加電圧と^<252>Cfからのアルファ線のエネルギー分解能の関係を調査したところ,電場勾配の増加とともに分解能はよくなり,-0.65kV/cmで1.76%の分解能を得た.これ以上の電場勾配では,電子がグリッドを通過する効率が悪くなるため,分解能も悪化した.
    この結果より,より現実的な印加電圧の範囲では,カソード・グリッド間距離は6cm程度となり,かなり明るい検出器が実現できた.また,核分裂片についてもアルファ線と明確に異なるパルス波高で観測することができた.検出器のデザイン変更のため,電荷測定には至らなかったが,十分測定可能な性能の検出器を製作することができた.

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Teaching Experience (researchmap)

Teaching Experience

  • 化学コロキウム

    2022
    Institution name:新潟大学

  • 統合化学入門

    2022
    Institution name:新潟大学

  • 不安定核物理学特論

    2022
    Institution name:新潟大学

  • 核化学特論

    2022
    Institution name:新潟大学

  • 重元素化学

    2022
    Institution name:新潟大学

  • 不安定核物理学概論

    2022
    Institution name:新潟大学

  • 先端科学技術総論

    2022
    Institution name:新潟大学

  • 無機化学III

    2021
    Institution name:新潟大学

  • 課題研究

    2021
    Institution name:新潟大学

  • 安全教育

    2021
    Institution name:新潟大学

  • 科学技術英語

    2021
    Institution name:新潟大学

  • コミュニケーション演習

    2021
    Institution name:新潟大学

  • 放射線計測学

    2021
    Institution name:新潟大学

  • 課題研究 a

    2020
    Institution name:新潟大学

  • 課題研究 b

    2020
    Institution name:新潟大学

  • 数理物質科学の最前線

    2020
    Institution name:新潟大学

  • 不安定核物理学概論

    2020
    Institution name:新潟大学

  • 化学コロキウム

    2020
    Institution name:新潟大学

  • 無機化学Ⅱ

    2017
    Institution name:新潟大学

  • 無機化学I

    2017
    Institution name:新潟大学

  • 理学スタディ・スキルズ

    2017
    -
    2021
    Institution name:新潟大学

  • 課題研究

    2017
    -
    2019
    Institution name:新潟大学

  • 自然科学総論Ⅰ

    2016
    Institution name:新潟大学

  • 科学技術英語

    2015
    -
    2021
    Institution name:新潟大学

  • コミュニケーション演習

    2015
    -
    2021
    Institution name:新潟大学

  • 数理物質科学特定研究ⅡA(化学)

    2014
    -
    2015
    Institution name:新潟大学

  • 化学コロキュウム

    2014
    Institution name:新潟大学

  • 数理物質科学特定研究ⅡB(化学)

    2014
    Institution name:新潟大学

  • グリーンケミストリー入門

    2013
    -
    2017
    Institution name:新潟大学

  • 無機化学II

    2013
    -
    2016
    Institution name:新潟大学

  • 課題研究(化学科)

    2013
    -
    2016
    Institution name:新潟大学

  • 数理物質科学特定研究Ⅰ(化学)

    2013
    -
    2015
    Institution name:新潟大学

  • 数理物質科学演習Ⅰ(化学)

    2013
    -
    2015
    Institution name:新潟大学

  • Basic Chemistry Ⅱ

    2013
    Institution name:新潟大学

  • 放射化学

    2008
    Institution name:新潟大学

  • 放射線計測学

    2008
    -
    2021
    Institution name:新潟大学

  • 放射化学特論

    2008
    -
    2018
    Institution name:新潟大学

  • 放射化学I

    2008
    -
    2011
    Institution name:新潟大学

  • 無機化学演習

    2007
    Institution name:新潟大学

  • 無機化学実験

    2007
    Institution name:新潟大学

  • 核化学特論

    2007
    -
    2020
    Institution name:新潟大学

  • 化学実験

    2007
    -
    2015
    Institution name:新潟大学

  • 大型機器分析技術

    2007
    -
    2013
    Institution name:新潟大学

  • スタディ・スキルズ(化学学習法)

    2007
    -
    2008
    Institution name:新潟大学

  • 放射化学II

    2007
    -
    2008
    Institution name:新潟大学

  • 重元素化学

    2007
    Institution name:新潟大学

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