Shell-model calculations for the zinc isotopes |
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Authors: | J.F.A. Van Hienen W. Chung B.H. Wildenthal |
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Affiliation: | Cyclotron Laboratory and Department of Physics, Michigan State University, East Lansing, Michigan 48824, USA |
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Abstract: | Shell-model calculations for the zinc isotopes have been carried out with active particles distributed in the orbits outside a closed “56Ni” core. The effective Hamiltonian used was one obtained by Koops and Glaudemans from a fit to Ni and Cu level energies. An average absolute deviation of 0.19 MeV between the calculated and experimental ground-state binding energies is obtained for the A = 62?68 Zn isotopes. Good agreement is also found between most calculated and experimental excitation energies and spectroscopic factors for single-nucleon transfer for the low-lying levels in these nuclei. Experimentally known B(E2) values are generally well reproduced by the present model with effective charges of 1.0 ± 0.1 and 1.6 ± 0.2 for the neutron and proton, respectively. Magnetic dipole as well as Gamow-Teller transitions are not well accounted for by these calculations and seem to be sensitive to excitations of the 56Ni core. |
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