Effective shell-model matrix elements

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Abstract
A technique for calculating effective shell-model matrix elements which has proved successful for 0P-shell calculations has been extended to the SD shell. Two-body matrix elements are compared with those obtained by Preedom and Wildenthal (1972) from fitting spectroscopic data. It is seen that tensor correlations are an essential ingredient in obtaining agreement. The inherent ambiguity in fitting single-particle energies and diagonal two-body matrix elements is exposed, and it is shown that the technique provides a satisfactory D-shell spin-orbit splitting.