Attractive and repulsive contributions of medium fluctuations to nuclear superfluidity
G. Gori, F. Ramponi, F. Barranco, P. F. Bortignon, R. A. Broglia, G. Colo', E. Vigezzi
Abstract
Oscillations of mainly surface character (S=0 modes) give rise, in atomic nuclei, to an attractive (induced) pairing interaction, while spin (S=1) modes of mainly volume character generate a repulsive interaction, the net effect being an attraction which accounts for a sizeable fraction of the experimental pairing gap. Suppressing the particle-vibration coupling mediated by the proton degrees of freedom, i.e., mimicking neutron matter, the total surface plus spin-induced pairing interaction becomes repulsive.
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