Isospin structure of J{sup {pi}}=1{sup +} states in {sup 58}Ni and {sup 58}Cu studied by {sup 58}Ni(p,p{sup '}) and {sup 58}Ni({sup 3}He,t){sup 58}Cu measurements
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043 (Japan)
- Indiana University Cyclotron Facility (IUCF), Bloomington, Indiana 47408 (United States)
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047 (Japan)
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 T{sub z} of the isospin T, where T{sub z}=(N-Z)/2. The analogous structure has been studied for the isobaric nuclei {sup 58}Ni and {sup 58}Cu by comparing the transitions from the {sup 58}Ni ground state (initial isospin T{sub i}=1 and J{sup {pi}}=0{sup +}) to the M1 and the Gamow-Teller (GT) states (J{sup {pi}}=1{sup +}) in {sup 58}Ni and {sup 58}Cu, respectively. For this purpose, proton inelastic scattering (p,p{sup '}) at E{sub p}=160 MeV and the charge-exchange ({sup 3}He,t) reaction at 140 MeV/nucleon were both measured at 0 deg., exciting final states with isospin T{sub f}=1 and 2 and T{sub f}=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 T{sub f}=1 and 2 of analog GT and M1 states were identified. The distribution of T{sub f}=2 states was also compared with results of {sup 58}Ni(d,{sup 2}He), {sup 58}Ni(t,{sup 3}He), and {sup 58}Ni(n,p) experiments, in which only T{sub f}=2 states are excited. The obtained GT strength distribution is compared with the results of shell-model calculations.
- OSTI ID:
- 20995123
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 75, Issue 3; Other Information: DOI: 10.1103/PhysRevC.75.034310; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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