Abstract
The low-lying yrast states in the {sup 51}Ca and {sup 52}Sc nuclei were investigated to obtain information on the evolution of the p{sub 1/2} and f{sub 5/2} 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 {nu}p{sub 1/2} and {nu}f{sub 5/2} orbitals in the Ca isotopes appears to be overestimated by the GXPF1A Hamiltonian.
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