The surface geometry of exotic nuclei

We analyze the surface geometry of the spherical even‐even Ca, Ni, Sn and Pb nuclei using two approaches: The relativistic Dirac‐Hartree‐Bogoliubov one with several parameter sets and the non‐relativistic Hartree‐Fock‐Bogoliubov one with the Gogny force. The proton and neutron density distributions are fitted to two‐parameter Fermi density distributions to obtain the half‐density radii and diffuseness parameters. Those parameters allow us to determine the nature of the neutron skins predicted by the models. The calculations are compared with existing experimental data.