Mass and isospin dependence of symmetry energy coefficients of finite nuclei

TL;DR

This paper investigates how the symmetry energy coefficients of finite nuclei depend on mass and isospin, proposing a modified formula to better describe these dependencies and improve mass predictions.

Contribution

A new modified formula for symmetry energy coefficients is proposed, enhancing the understanding of mass and isospin effects in finite nuclei.

Findings

Enhanced symmetry energy coefficients for nearly symmetric nuclei

The modified formula reduces the rms deviation of nuclear mass predictions

Provides a better description of symmetry energy dependence on mass and isospin

Abstract

Mass and isospin dependence of symmetry energy coefficients $a_{sym}$ of finite nuclei is investigated with the measured nuclear masses incorporating the liquid drop mass formula. The enhanced $a_{sym}$ for nearly symmetric nuclei are observed. To describe the mass and isospin dependence of $a_{sym}$, a modified formula based on the conventional surface-symmetry term is proposed and the corresponding rms deviation of nuclear masses is checked.