Abstract
The (-1)A energy states of 50Ti, 51V, 52Cr, 53Mn, 54Fe and 55Co are calculated within the spherical shell-model framework, assuming a 48Ca closed core and the (Z-20) valence protons to occupy orbitals in the complete 0f-1p major shell. Both the schematic surface delta interaction (SDI) and the realistic Kuo-Brown (KB) force are used as effective two-body interactions, the interaction strength in the first case being smoothly decreased with increasing mass number. At least 40 experimental levels are well accounted for and the resultant wavefunctions are used to calculate E2 transition rates. Although the two interactions render very similar results, the KB spectra are generally too expanded and the B(E2) values too small. The failure of the present calculations to account for the low-lying 0+ excited states in the even-mass nuclei points to the necessity to allow for 0f7/2 neutron-shell excitations.
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