Gamow-Teller transitions from 58Ni to discrete states of 58Cu |
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Authors: | Y. Fujita H. Fujita T. Adachi G.P.A. Berg E. Caurier H. Fujimura K. Hara K. Hatanaka Z. Janas J. Kamiya T. Kawabata K. Langanke G. Martınez-Pinedo T. Noro E. Roeckl Y. Shimbara T. Shinada S.Y. van der Werf M. Yoshifuku M. Yosoi R.G.T. Zegers |
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Affiliation: | Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan, JP Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan, JP Institut de Recherches Subatomiques (IN2P3-CNRS-Université Louis Pasteur), F-67037 Strasbourg Cedex 2, France, FR Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany, DE Department of Physics, Kyoto University, Sakyo, Kyoto 606-8502, Japan, JP Institute of Physics and Astronomy, University of ?rhus, DK-8000 ?rhus C, Denmark, DK Kernfysisch Versneller Instituut, NL-9747 AA Groningen, The Netherlands, NL SPring-8, JAERI, Mikazuki, Sayo, Hyogo 679-5148, Japan, JP
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Abstract: | Under the assumption that isospin is a good quantum number, symmetry is expected for the transitions from the ground states of T = 1, T z = ±1 nuclei to the common excited states of the T z = 0 nucleus situated between the two nuclei. The symmetry can be studied by comparing the strengths of Gamow-Teller (GT) transitions obtained from a (p, n)-type charge-exchange reaction on a target nucleus with T z = 1 with those from the β-decay of the T z = - 1 nucleus. The A = 58 system is the heaviest for which such a comparison is possible. As a part of the symmetry study, we measured the GT transitions from 58Ni (T z = 1) to 58Cu (T z = 0) by using the zero-degree (3 He, t) reaction at 150 MeV/nucleon. With the achieved resolution of 50 keV, many hitherto unresolved GT states have been identified. The GT transition strengths were obtained for states up to 8 MeV excitation, i.e., near to the Q window limitation ( Q EC = 9.37 MeV) of the β-decay from 58Zn (T z = - 1) to 58Cu. The strength distribution is compared with that from shell-model calculations. Received: 24 November 2001 / Accepted: 30 January 2002 |
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Keywords: | PACS. 21.10.Hw Spin, parity and isobaric spin – 21.60.Cs Shell model – 25.55.Kr Charge-exchange reactions – 27.40.+z 39 ?A? 58 |
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