Abstract
It is found that core-deformations, as treated by Nilsson, can account for a major part of the many types of discrepancy between simple shell-model expectations and observed trends in beta-decays rates, among very light as well as heavier nuclei. Not only are the well-known suppressions of normal allowed transitions relative to shell-model expectations treated, but similar suppressions among forbidden transitions, distinguished here for the first time. Significant confirmation for applications of the deformed-core picture even to mirror nuclei comes from a correlation discovered between certain l-forbidden decay enhancements and super-allowed decay suppressions.
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