Correlation between observed alpha decays and changes in neutron or proton skins from parent to daughter nuclei

摘要

The change of proton and neutron skin thicknesses is investigated in nuclei after alpha decay. The skin thicknesses are self-consistently calculated. The observed alpha decays lead to relatively large decrease of the proton skin in the daughter nuclei. A large increase of the neutron skin in the daughter nucleus reflects the hindered alpha decay. This hindrance is related to the decrease of both the Q(alpha) value and the preformation probability in the parent nucleus. For each isotopic chain, the observed half-lives consistently correlate with the change of the proton (neutron) skin thickness, from parent to daughter nuclei.