Collective aspects of pairing interaction in nuclei Original Research Article

We investigate the role the interweaving of surface vibrations and nucleon motion has on Cooper pair formation in spherical superfluid nuclei. This is done solving self-consistently the Dyson equation with the normal and anomalous density Green functions. Effective and realistic nucleon-nucleon interactions are used. It is found, that the pairing gap receives about equal contributions from the bare and from the induced interaction. It is furthermore found that the self-energy processes reduce the pairing gap by about 20%. The extreme cases of the 11Li and 12Be nuclei are also discussed.