Combinatorial nuclear level-density model

TL;DR

This paper introduces a comprehensive microscopic nuclear level-density model that explicitly incorporates pairing, rotational, and vibrational states, enabling detailed analysis of nuclear level distributions and comparison with experimental data.

Contribution

It presents a novel combinatorial (micro-canonical) nuclear level-density model based on the folded-Yukawa potential with explicit state treatments, advancing microscopic understanding.

Findings

Model accurately reproduces neutron separation energy level spacings.

Matches total level-density functions from Oslo method.

Aligns with cumulative level densities and parity ratio data.

Abstract

A microscopic nuclear level-density model is presented. The model is a completely combinatorial (micro-canonical) model based on the folded-Yukawa single-particle potential and includes explicit treatment of pairing, rotational and vibrational states. The microscopic character of all states enables extraction of level distribution functions with respect to pairing gaps, parity and angular momentum. The results of the model are compared to available experimental data: neutron separation energy level spacings, data on total level-density functions from the Oslo method, cumulative level densities from low-lying discrete states, and data on parity ratios.