Exotic phenomena in medium mass N ≃ Z nuclei within the beyond-mean-field approach

Abstract

Recent studies on properties of proton-rich nuclei in the A = 70 mass region brought insights into fundamental symmetries and interactions and produced characteristics required by the astrophysical scenarios on the rp-process path revealing coexistence phenomena which dominate the structure and dynamics of these exotic nuclei. Isospin mixing and related phenomena like Coulomb energy differences, mirror energy differences, triplet energy differences as well as superallowed Fermi beta decay in isovector triplets have been investigated. The interplay between isospin-symmetry-breaking and shape-coexistence effects on isospin-related phenomena in nuclei as well as weak interaction processes under terrestrial and stellar x-ray burst environment have been explored in the frame of the beyond-mean-field complex Excited Vampir variational model. We used an adequate model space and the effective interaction was derived from a G-matrix starting from the charge-dependent Bonn CD potential. Results concerning the influence of shape coexistence and mixing on the structure and β-decay properties of exotic nuclei will be reviewed.