Isospin structure of Jπ=1+ states in Ni58 and Cu58 studied by Ni58(p,p') and Ni58(He3,t)Cu58 measurements

H. Fujita, Y. Fujita, T. Adachi, A. D. Bacher, G. P.A. Berg, T. Black, E. Caurier, C. C. Foster, H. Fujimura, K. Hara, K. Harada, K. Hatanaka, J. Jänecke, J. Kamiya, Y. Kanzaki, K. Katori, T. Kawabata, K. Langanke, G. Martínez-Pinedo, T. NoroD. A. Roberts, H. Sakaguchi, Y. Shimbara, T. Shinada, E. J. Stephenson, H. Ueno, T. Yamanaka, M. Yoshifuku, M. Yosoi

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Abstract

Isospin is a good quantum number under the assumption that the nuclear interaction is charge independent. An analogous structure of excited states is expected for nuclei with the same mass number A but with different z components Tz of the isospin T, where Tz=(N-Z)/2. The analogous structure has been studied for the isobaric nuclei Ni58 and Cu58 by comparing the transitions from the Ni58 ground state (initial isospin Ti=1 and Jπ=0+) to the M1 and the Gamow-Teller (GT) states (Jπ=1+) in Ni58 and Cu58, respectively. For this purpose, proton inelastic scattering (p,p') at Ep=160 MeV and the charge-exchange (He3,t) reaction at 140 MeV/nucleon were both measured at 0°, exciting final states with isospin Tf=1 and 2 and Tf=0, 1, and 2, respectively. High energy and scattering-angle resolutions were achieved by applying complete beam matching techniques. On the basis of the correspondence between excitation energies and transition strengths, isospin values Tf=1 and 2 of analog GT and M1 states were identified. The distribution of Tf=2 states was also compared with results of Ni58(d,He2), Ni58(t,He3), and Ni58(n,p) experiments, in which only Tf=2 states are excited. The obtained GT strength distribution is compared with the results of shell-model calculations.

Original languageEnglish
Article number034310
JournalPhysical Review C - Nuclear Physics
Volume75
Issue number3
DOIs
Publication statusPublished - Mar 21 2007

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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