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

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.034310· OSTI ID:20995123

Fujita, H; Fujita, Y; Adachi, T; Harada, K; Kanzaki, Y; Katori, K; Shimbara, Y; Shinada, T; Ueno, H; Yoshifuku, M ^[1]; Bacher, A D; Black, T; Foster, C C; Stephenson, E J ^[2]; Berg, G P. A.; Fujimura, H; Hara, K; Hatanaka, K; Kawabata, T; Noro, T ^[3]

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1. Department of Physics, Osaka University, Toyonaka, Osaka 560-0043 (Japan)
2. Indiana University Cyclotron Facility (IUCF), Bloomington, Indiana 47408 (United States)
3. 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, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BEAMS
CHARGE EXCHANGE
COPPER 58
DISTRIBUTION
EXCITATION
EXCITED STATES
GAMOW-TELLER RULES
GROUND STATES
HELIUM 2
HELIUM 3
INELASTIC SCATTERING
ISOBARIC NUCLEI
ISOSPIN
MASS NUMBER
MEV RANGE 100-1000
NICKEL 58
PROTONS
SHELL MODELS