Abstract
Background: Information on charge-dependent (i.e., isospin-non-conserving) interactions is extracted from excited states of mirror nuclei.Purpose: Specifically, the purpose of the study is to extract effective isovector (${V}_{pp}\ensuremath{-}{V}_{nn}$) interactions which, in general, can either be of Coulomb or nuclear origin.Methods: A comprehensive shell-model description of isospin-breaking effects is used to fit data on mirror energy differences in the A = 42--54 region. The angular-momentum dependence of isospin-breaking interactions was determined from a systematic study of mirror energy differences.Results: The results reveal a significant isovector term, with a very strong spin dependence, beyond that expected of a two-body Coulomb interaction.Conclusions: The isospin-breaking terms that are extracted have a $J$ dependence that is not consistent with the known CSB properties of the bare nucleon-nucleon interaction.
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