Volume and surface contributions to the nuclear symmetry energy within the coherent density fluctuation model

TL;DR

This paper investigates the volume and surface components of the nuclear symmetry energy using the coherent density fluctuation model and Skyrme functional, analyzing isotopic chains and comparing with experimental data.

Contribution

It introduces a combined approach using CDFM and Skyrme functionals to evaluate volume and surface contributions to the nuclear symmetry energy in finite nuclei.

Findings

Volume and surface contributions vary across isotopic chains.

Results show good agreement with experimental data and other theoretical models.

The ratio of surface to volume contributions depends on isotopic composition.

Abstract

The volume and surface components of the nuclear symmetry energy (NSE) and their ratio are calculated within the coherent density fluctuation model (CDFM). The estimations use the results of the model for the NSE in finite nuclei based on the Brueckner energy-density functional for nuclear matter. In addition, we present results for the NSE and its volume and surface contributions obtained by using the Skyrme energy-density functional. The CDFM weight function is obtained using the proton and neutron densities from the self-consistent HF+BCS method with Skyrme interactions. We present and discuss the values of the volume and surface contributions to the NSE and their ratio obtained for the Ni, Sn, and Pb isotopic chains studying their isotopic sensitivity. The results are compared with estimations of other approaches which have used available experimental data on binding energies, neutron-skin thicknesses, excitation energies to isobaric analog states (IAS) and also with results of other theoretical methods.