Impact of finite-range spin-orbit and tensor terms in Gogny EDF

TL;DR

This paper introduces a finite-range extension of the Gogny Energy Density Functional, incorporating spin-orbit and tensor terms, and evaluates its impact on nuclear matter and properties, aiming to improve nuclear modeling accuracy.

Contribution

It presents a novel finite-range Gogny EDF with spin-orbit and tensor terms, along with an adapted fitting protocol including new constraints from experimental data.

Findings

Enhanced description of nuclear matter properties.

Improved spectroscopic and fission property predictions.

Potential for more accurate nuclear models with finite-range terms.

Abstract

Energy Density Functionals are of major interest for the study of the atomic nucleus as, coupled with mean-field and beyond N-body approaches, they are applicable to the whole nuclear chart, including superheavy elements. On the one hand, the growing need for nuclear data and, on the other hand, the large amount of experimental data on exotic nuclei explain the work carried out on these phenomenological forms of the nucleon-nucleon interaction to analyze the richness of the nuclear phenomena. In this paper, we propose a fully finite-range extension of the Gogny EDF, including a short-range spin-orbit term and a long-range tensor term. The original fitting protocol of the Gogny interaction has been adapted to include both finite range spin-orbit and tensor terms, adding new constraints and filters linked to relevant data. Nuclear matter, spectroscopic and fission properties are discussed, highlighting ways of improving EDFs when all spin and isospin exchanges are introduced with finite-range terms.