Global analysis of isospin dependent microscopic nucleon-nucleus optical potential in Dirac Bruckner Hartree-Fock approach

TL;DR

This paper performs a comprehensive analysis of the isospin-dependent nucleon-nucleus optical potential using a relativistic microscopic approach based on Dirac-Brueckner-Hartree-Fock theory, applicable to a wide range of nuclei and energies.

Contribution

It introduces a global analysis of the nucleon-nucleus optical potential derived from DBHF calculations, extending to asymmetric nuclear matter with no adjustable parameters.

Findings

The model accurately reproduces scattering data below 200 MeV.

It provides a consistent description of spin-orbit and central potentials.

The approach successfully describes isospin asymmetry effects in nuclear scattering.

Abstract

The Microscopic Otical Model Potential is evaluated within a relativistic scheme which provides a natural and consistent relation between the spin-orbit part and the central part of the potential. The Dirac-Brueckner-Hartree-Fock (DBHF) approach provides such a microscopic relativistic scheme, which is based on a realistic nucleon-nucleon interaction and reproduce the saturation properties of symmetric nuclear matter without any adjustable parameter. Its solution using the projection technique within the subtracted T-matrix (STM) representation provides a reliable extension to asymmetric nuclear matter, which is important to describe the features of the isospin asymmetric nuclei. Therefore, the present work aims to perform a global analysis of the isospin-dependent nucleon-nucleus MOP based on the DBHF calculation in symmetric and asymmetric nuclear matter. The DBHF is used to evaluate the relativistic structure of the nucleon self-energies in nuclear matter at various densities and asymmetries. The Schr\"odinger equivalent potentials of finite nuclei are derived from these Dirac components by a local density approximation (LDA). The nucleon-nucleus scattering calculations are carried out for a broad spectrum $n$ and $p$ scattering experiments below 200 MeV with targets ranging from $^{12}$C to $^{208}$Pb.