Comparative study on charge radii and their kinks at magic numbers

Isotope dependences of charge radii, i.e., isotope shifts, calculated by the Skyrme Hartree-Fock, relativistic mean-field, and Hartree-Fock calculations are compared against experimental data magic semimagic nuclei. It is found that tensor interaction plays a role in reproducing ``kink'' behavior, irregularity shifts at neutron number, approach. With several models, it kink behavior can be reproduced with spin-orbit having nonzero isovector channel. The single-particle orbitals near Fermi energy crucial to determine size. effects symmetry pairing also discussed relation behavior.