Pairing in nuclear matter and finite nuclei

Effects of pairing with isospin T = 0 and T = 1 are systematically studied in a model, which is based on a realistic nucleon-nucleon interaction and allows us to describe the transition from infinite nuclear matter to finite nuclei. Special attention is paid to the development of the spin-orbit term in the mean field of nucleons in finite nuclei. The spin-orbit term yields a drastic suppression of T = 0 proton-neutron pairing but does not lead to a complete disappearance in finite nuclei. Arguments are presented as to why no clear evidence of T = 0 pairing can be observed in the binding energies of finite nuclei.