# Test of nuclear level density inputs for Hauser-Feshbach model calculations

## TL;DR

This study measures particle emission spectra from specific nuclear reactions and compares them with Hauser-Feshbach model predictions, revealing discrepancies due to inadequate level density models, and proposes new level density parameters.

## Contribution

It provides new level density data and parameters for nuclei like 60Ni, 60Co, and 57Fe, highlighting issues with existing models.

## Key findings

- Existing level density models do not match experimental data.
- New level density parameters were derived for several nuclei.
- Discrepancies indicate need for improved level density inputs in models.

## Abstract

The energy spectra of neutrons, protons, and alpha-particles have been measured from the d+59Co and 3He+58Fe reactions leading to the same compound nucleus, 61$Ni. The experimental cross sections have been compared to Hauser-Feshbach model calculations using different input level density models. None of them have been found to agree with experiment. It manifests the serious problem with available level density parameterizations especially those based on neutron resonance spacings and density of discrete levels. New level densities and corresponding Fermi-gas parameters have been obtained for reaction product nuclei such as 60Ni,60Co, and 57Fe.