Eur. Phys. J. A 13, 411-418 (2002)
Gamow-Teller transitions from to discrete states of
The study of isospin symmetry in atomic nucleiY. Fujita1, H. Fujita1, T. Adachi1, G.P.A. Berg2, E. Caurier3, H. Fujimura2, K. Hara2, K. Hatanaka2, Z. Janas4, 5, J. Kamiya2, T. Kawabata6, K. Langanke7, G. Martínez-Pinedo7, T. Noro2, E. Roeckl4, Y. Shimbara1, T. Shinada1, S.Y. van der Werf8, M. Yoshifuku1, M. Yosoi6 and R.G.T. Zegers9
1 Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
2 Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
3 Institut de Recherches Subatomiques (IN2P3-CNRS-Université Louis Pasteur), F-67037 Strasbourg Cedex 2, France
4 Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany
5 Institute of Experimental Physics, Warsaw University, PL-00-681 Warsaw, Poland
6 Department of Physics, Kyoto University, Sakyo, Kyoto 606-8502, Japan
7 Institute of Physics and Astronomy, University of Århus, DK-8000 Århus C, Denmark
8 Kernfysisch Versneller Instituut, NL-9747 AA Groningen, The Netherlands
9 SPring-8, JAERI, Mikazuki, Sayo, Hyogo 679-5148, Japan
(Received: 24 November 2001 / Revised version: 15 January 2002 Communicated by J. Äystö)
Under the assumption that isospin is a good quantum number, symmetry is expected for the transitions from the ground states of 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 -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 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 ( MeV) of the -decay from 58Zn ( Tz=-1) to 58Cu. The strength distribution is compared with that from shell-model calculations.
21.10.Hw - Spin, parity and isobaric spin.
21.60.Cs - Shell model.
25.55.Kr - Charge-exchange reactions.
27.40.+z - .
© Società Italiana di Fisica, Springer-Verlag 2002