Pairing and realistic shell-model interactions

TL;DR

This paper investigates the pairing properties of a realistic shell-model interaction in nuclei around 132Sn, highlighting the importance of one particle-one hole excitations in explaining differences between proton and neutron pairing.

Contribution

It provides a detailed analysis of pairing interactions using a realistic shell-model approach, emphasizing the role of excitations in nuclei near 132Sn.

Findings

Significant difference between proton and neutron pairing in 134Te and 134Sn.

Key role of one particle-one hole excitations in pairing properties.

Validation of realistic shell-model interactions for describing nuclei around 132Sn.

Abstract

This paper starts with a brief historical overview of pairing in nuclei, which fulfills the purpose of properly framing the main subject. This concerns the pairing properties of a realistic shell-model effective interaction which has proved very successful in describing nuclei around doubly magic 132Sn. We focus attention on the two nuclei 134Te and 134Sn with two valence protons and neutrons, respectively. Our study brings out the key role of one particle-one hole excitations in producing a significant difference between proton and neutron pairing in this region.