Coexistence of isospin I = 0 and I = 1 pairings in asymmetric nuclear matter

TL;DR

This paper investigates the conditions under which neutron-neutron, proton-proton, and neutron-proton pairings coexist in asymmetric nuclear matter, revealing that n-p pairing dominance is crucial for their coexistence and is influenced by the pairing strengths.

Contribution

It provides a detailed analysis of the coexistence conditions of different pairings in asymmetric nuclear matter using an effective density-dependent contact pairing potential.

Findings

n-p pairing must be stronger than n-n and p-p for coexistence

n-n and p-p pairs can enhance n-p pairing when dominant

n-p pairing is suppressed when n-n and p-p are comparable

Abstract

The coexistence of neutron-neutron (n-n), proton-proton (p-p), and neutron-proton (n-p) pairings is investigated by adopting an effective density-dependent contact pairing potential. These three types of pairings can coexist only if the n-p pairing is stronger than the n-n and p-p pairings for isospin asymmetric nuclear matter. In addition, the existence of n-n and p-p pairs might enhance n-p pairings in asymmetric nuclear matter when the n-p pairing strength is significantly stronger than the n-n and p-p ones. Conversely, the n-p pairing is reduced by the n-n and p-p pairs when the n-p pairing interaction approaches n-n and p-p pairings.