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Description
Differences between excitation energies of analogue states in mirror nuclei depend on the variations of the nuclear radius as a function of the spin. These mirror energy differences (MED) can be reproduced by shell model calculations where the evolution of the radius can be accounted for through the occupation of low-l orbits, that present larger radius than the large-l ones in a main shall. Recent data on MED put in evidence the reduction of the low-l orbital radius when they are not fractionally occupied.
Due to the isovector monopole polarizability, proton and neutron radii tend to equalize but still a neutron skin develops. It will be shown that data on MED for sd shell nuclei can be used to estimate the skin of each excited state. Interestingly, the skin is correlated with the difference of occupation number of neutrons and protons in the
