Liquid-gas instability and superfluidity in nuclear matter

Abstract

We study effects of the medium polarization on superfluidity in symmetric nuclear matter in a relativistic formalism. An effect of the liquid-gas instability is emphasized. We examine two types of decomposition of the nucleon propagator; the standard Feynman-density and the particle-hole-antiparticle ones. In both cases, the medium polarization effect is determined by a characteristic cancellation among the σ, the longitudinal ω, and the σ-ωmixed polarizations. The instability leads to increase of pairing gap. Around the saturation density that is free from the instability the medium polarization enhances pairing gap in the former case whereas reduces in the latter. At the lowest density that is also free from the instability the gap increases in both cases.

20 pages, 10 figures

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Cited by in corpus (3)

• Nuclear "pasta" structures in low-density nuclear matter and neutron star crust
• Three dimensional structure of low-density nuclear matter
• Nuclear matter superfluidity in an effective hadronic field model with excluded volume corrections