Mirror Nuclei: Symmetry Breaking and Nuclear Dynamics

Differences in excitation energy between isobaric analogue states are measured to study the validity of isospin symmetry in medium-mass nuclei as a function of the angular momentum These differences are of the order of tens of keV and can be well reproduced by state-of-the-art shell model calculations. Several nuclear structure properties can be deduced from these data, such as the alignment of nucleons along rotational bands, the evolution of the nuclear radius and the appearance of pure single particle configurations across two main shells. In addition, the isospin breaking of the nuclear interaction is suggested by the systematic comparison with the data