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.
Attractive and repulsive contributions of medium fluctuations to nuclear superfluidity / G. Gori, F. Ramponi, F. Barranco, P.F. Bortignon, R.A. Broglia, G. Colò, E. Vigezzi. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - 72:1(2005 Jul), pp. 011302.11302-1-011302.11302-5. [10.1103/PhysRevC.72.011302]
Attractive and repulsive contributions of medium fluctuations to nuclear superfluidity
G. Gori;F. Ramponi;P.F. Bortignon;R.A. Broglia;G. Colò;
2005
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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