[en] 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