Three-body Force Effects on the Properties of Neutron-rich Nuclear Matter

TL;DR

This paper investigates how three-body forces influence the properties and equation of state of neutron-rich nuclear matter, emphasizing their importance in accurately modeling nuclear and neutron star matter.

Contribution

It extends the Brueckner-Hartree-Fock approach by incorporating a microscopic three-body force, revealing its significant impact on nuclear matter properties and symmetry energy.

Findings

TBF significantly alters the nuclear matter EOS at high densities.

Inclusion of TBF is essential for reproducing empirical saturation properties.

TBF effects are crucial for predicting nucleon superfluidity in neutron stars.

Abstract

We review our research work on the single-particle properties and the equation of state (EOS) of isospin asymmetric nuclear matter within the framework of the Brueckner-Hartree-Fock (BHF) approach extended by including a microscopic three-body force (TBF). The TBF is shown to affect significantly the nuclear matter EOS and the density dependence of nuclear symmetry energy at high densities above the normal nuclear matter density, and it is necessary for reproducing the empirical saturation property of symmetric nuclear matter in a nonrelativistic microscopic framework. The TBF-induced rearrangement effect and the ground state (g.s.) correlation effect on the s.p. properties in neutron-rich nuclear matter are investigated. Both effects turn out to be crucial for predicting reliably the s.p. properties within the Brueckner framework. The TBF effect on nucleon superfluidity in neutron star matter and neutron stars has also been discussed.