Folded diagrams and s-d shell effective interactions

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Abstract

Folded diagrams with one to four folds are calculated for the two-body s-d shell effective interaction. Their main effect is to renormalize the non-folded terms by a wound-integral factor (1 − 2κ), κ being approximately 0.15. When used in a conventional A = 18 to 20 shell-model calculation, the folded diagram effective interaction yields reasonable excitation energy spectra, but not enough ground state binding energies.

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