Off-Shell Behavior of Nucleon Self-Energy in Asymmetric Nuclear Matter

TL;DR

This paper investigates how the nucleon self-energy behaves off-shell in asymmetric nuclear matter using a relativistic approach, analyzing momentum and energy dependencies and their implications for effective mass and spectral functions.

Contribution

It provides a detailed relativistic analysis of off-shell nucleon self-energy in asymmetric nuclear matter, highlighting the momentum and energy dependence of the Dirac components.

Findings

Dependence of self-energy components on momentum and energy analyzed

Impacts on effective nucleon mass definitions discussed

Spectral functions and optical potential contributions examined

Abstract

The off-shell behavior of the nucleon self-energy in isospin asymmetric nuclear matter is investigated within the framework of relativistic Dirac-Brueckner-Hartree-Fock approach based on projection techniques. The dependence of the Dirac components of the self-energy on momentum as well as energy is evaluated for symmetric as well as asymmetric nuclear matter. Special attention is paid to the various contributions to the momentum dependence of the real and imaginary part of the optical potential. The consequences to the different definitions of the effective nucleon mass and particle spectral functions are discussed.