Excitation energy and angular momentum dependence of the nuclear level density parameter around A\(\approx \)110

• Published in: arXiv.org 2020-12
• Main Authors: Pratap, Roy, Mukhopadhyay, S, Aggarwal, Mamta, Pandit, Deepak, Rana, T K, Kundu, Samir, Ghosh, T K, Banerjee, K, Mukherjee, G, Manna, S, Sen, A, Pandey, R, Mondal, Debasish, Pal, S, Paul, D, Atreya, K, Bhattacharya, C
• Format: Article
• Language: English
• Subjects: Angular momentum; Density; Dependence; Energy; Energy spectra; Excitation; High temperature; Kinetic energy; Nuclear reactions; Parameters
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2012.03462

Neutron kinetic energy spectra in coincidence with low-energy \(\gamma \)-ray multiplicities have been measured around \(A\approx \) 110 in the \(^{16}\)O, \(^{20}\)Ne + \(^{93}\)Nb reactions in a compound nuclear excitation energy range of \(\approx \) 90 - 140 MeV. The excitation energy (temperature) and angular momentum (spin) dependence of the inverse level density parameter \(k\) has been investigated by comparing the experimental data with statistical Hauser-Feshbach calculation. In contrast to the available systematic in this mass region, the inverse level density parameter showed an appreciable increase as a function of the excitation energy. The extracted \(k\)-values at different angular momentum regions, corresponding to different \(\gamma \)-multiplicities also showed an overall increase with the average nuclear spins. The experimental results have been compared with a microscopic statistical-model calculation and found to be in reasonable agreement with the data. The results provide useful information to understand the variation of nuclear level density at high temperature and spins.