Neutron skin and giant resonances in nuclei

Some aspects, both experimental and theoretical, of extracting the neutron skin ΔRΔR from properties of isovector giant resonances are discussed. Existing proposals are critically reviewed. The method relying on the energy difference between the Gamow–Teller resonance and the isobaric analogue state is shown to lack sensitivity to ΔRΔR. A simple explanation of the linear relation between the symmetry energy and the neutron skin is also presented.