Toward an Ab-initio Description of Quasiparticle Properties

TL;DR

This paper explores the use of ab-initio many-body Green's functions theory, specifically the Faddeev-random-phase-approximation, to accurately describe quasiparticle properties in nuclei, with potential applications to medium-large nuclear systems.

Contribution

It demonstrates the potential of the Faddeev-random-phase-approximation method for microscopic nuclear studies and applies it to specific nuclear shells to analyze correlation effects.

Findings

High accuracy in ground state energy calculations for He-4

Significant role of long-range correlations in spectroscopic factors

Dependence of properties on nuclear asymmetry

Abstract

Preliminary ab-initio applications of many-body Green's functions theory to the ground state of He-4 suggest that high accuracy can be achieved in the so-called Faddeev-random-phase-approximation method. We stress the potentialities of this approach for microscopic studies of medium-large nuclei and report applications to 1s0d and 1p0f-shell nuclei. In particular, we discuss the role of long-range correlations on spectroscopic factors and their dependence on asymmetry.