The low-lying yrast states in the 51Ca and 52Sc nuclei were investigated to obtain information on the evolution of the p1/2 and f5/2 neutron single-particle orbitals in neutron-rich nuclei near proton number Z=20. Level structures associated with neutron excitations into these two orbitals and with proton excitations across the Z=20 shell gap were identified. Shell-model calculations with the recently proposed GXPF1A interaction account reasonably well for the fp-shell states. The energy separation between the νp1/2 and νf5/2 orbitals in the Ca isotopes appears to be overestimated by the GXPF1A Hamiltonian.
Yrast structure of the neutron-rich N=31 isotones Ca-51 and Sc-52
LUNARDI, SANTO;MONTAGNOLI, GIOVANNA;SCARLASSARA, FERNANDO;
2008
Abstract
The low-lying yrast states in the 51Ca and 52Sc nuclei were investigated to obtain information on the evolution of the p1/2 and f5/2 neutron single-particle orbitals in neutron-rich nuclei near proton number Z=20. Level structures associated with neutron excitations into these two orbitals and with proton excitations across the Z=20 shell gap were identified. Shell-model calculations with the recently proposed GXPF1A interaction account reasonably well for the fp-shell states. The energy separation between the νp1/2 and νf5/2 orbitals in the Ca isotopes appears to be overestimated by the GXPF1A Hamiltonian.
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