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Gamow-Teller transitions from 58Ni to discrete states of 58Cu

The study of isospin symmetry in atomic nuclei
  • 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

Abstract:

Under the assumption that isospin is a good quantum number, symmetry is expected for the transitions from the ground states of T = 1, Tz = ±1 nuclei to the common excited states of the Tz = 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 Tz = 1 with those from the β-decay of the Tz = - 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 (Tz = 1) to 58Cu (Tz = 0) by using the zero-degree (3He, 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 ( QEC = 9.37 MeV) of the β-decay from 58Zn (Tz = - 1) to 58Cu. The strength distribution is compared with that from shell-model calculations.

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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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2002

Authors and Affiliations

  • Y. Fujita
    • 1
  • H. Fujita
    • 1
  • T. Adachi
    • 1
  • G.P.A. Berg
    • 2
  • E. Caurier
    • 3
  • H. Fujimura
    • 2
  • K. Hara
    • 2
  • K. Hatanaka
    • 2
  • Z. Janas
    • 4
  • J. Kamiya
    • 2
  • T. Kawabata
    • 5
  • K. Langanke
    • 6
  • G. Martınez-Pinedo
    • 6
  • T. Noro
    • 2
  • E. Roeckl
    • 4
  • Y. Shimbara
    • 1
  • T. Shinada
    • 1
  • S.Y. van der Werf
    • 7
  • M. Yoshifuku
    • 1
  • M. Yosoi
    • 5
  • R.G.T. Zegers
    • 8
  1. 1.Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, JapanJP
  2. 2.Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, JapanJP
  3. 3.Institut de Recherches Subatomiques (IN2P3-CNRS-Université Louis Pasteur), F-67037 Strasbourg Cedex 2, FranceFR
  4. 4.Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, GermanyDE
  5. 5.Department of Physics, Kyoto University, Sakyo, Kyoto 606-8502, JapanJP
  6. 6.Institute of Physics and Astronomy, University of Århus, DK-8000 Århus C, DenmarkDK
  7. 7.Kernfysisch Versneller Instituut, NL-9747 AA Groningen, The NetherlandsNL
  8. 8.SPring-8, JAERI, Mikazuki, Sayo, Hyogo 679-5148, JapanJP

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