Calculation of microscopic nuclear level densities based on covariant density functional theory

TL;DR

This paper introduces a microscopic approach to calculating nuclear level densities using covariant density functional theory, incorporating collective effects and comparing results with experimental data and other models.

Contribution

It develops a covariant density functional theory-based method for nuclear level density calculation, including collective effects, and validates it against experimental data and existing models.

Findings

The method produces results consistent with experimental data.

It captures general trends of other models with some deviations.

The approach offers a reasonable microscopic alternative for NLD calculations.

Abstract

A microscopic method for calculating nuclear level density (NLD) based on the covariant density functional theory (CDFT) is developed. The particle-hole state density is calculated by combinatorial method using the single-particle levels schemes obtained from the CDFT. Then the level densities are obtained by taking into account collective effects such as vibration and rotation. Our results are compared with those from other NLD models, including phenomenological, microstatistical, and non-relativistic HFB combinatorial models. The comparison suggests that the general trends among these models are basically the same, except for some deviations from different NLD models. In addition, the NLDs of the CDFT combinatorial method with normalization are compared with experimental data, including the observed cumulative number of levels at low excitation energy and the measured NLDs. Compared with the existing experimental data, the CDFT combinatorial method can give reasonable results.