Isospin Dependence of 1S0 Proton and Neutron Superfluidity in Asymmetric Nuclear Matter

Abstract

We investigate the ${}^1{S}_0$ neutron and proton superfluidity in isospin asymmetric nuclear matter. We have concentrated on the isospin dependence of the pairing gaps and the effect of a microscopic three-body force. It is found that as the isospin asymmetry goes higher, the neutron ${}^1{S}_0$ superfluid phase shrinks gradually to a smaller density domain, while the proton one extends rapidly to a much wider density domain. The three-body force turns out to weaken the neutron ${}^1{S}_0$ superfluidity slightly, but it suppresses strongly the proton ${}^1{S}_0$ superfluidity at high densities in nuclear matter with large isospin asymmetry.

arXiv comment12 pages, 2 figures

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• Viscosity of neutron star matter and $r$-modes in rotating pulsars
• Nuclear superfluidity in isospin asymmetric matter within the Skyrme model