Phys. Rev. C 75, 034310 (2007) [15 pages]Isospin structure of Jπ=1+ states in 58Ni and 58Cu studied by 58Ni(p,p') and 58Ni(3He,t)58Cu measurementsReceived 31 March 2006; published 21 March 2007 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 58Ni and 58Cu by comparing the transitions from the 58Ni ground state (initial isospin Ti=1 and Jπ=0+) to the M1 and the Gamow-Teller (GT) states (Jπ=1+) in 58Ni and 58Cu, respectively. For this purpose, proton inelastic scattering (p,p') at Ep=160 MeV and the charge-exchange (3He,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 58Ni(d,2He), 58Ni(t,3He), and 58Ni(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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.75.034310
DOI:
10.1103/PhysRevC.75.034310
PACS:
25.40.Ep, 24.30.Cz, 25.55.Kr, 27.40.+z
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