Combinatorial level densities for practical applications

S. Hilaire^1a, S. Goriely², M. Girod¹, A.J. Koning³, R. Capote⁴ and M. Sin⁵

¹ CEA, DAM, DIF, F-91297, Arpajon, France
² Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, Campus de la Plaine CP 226, BE-1050 Brussels, Belgium
³ Nuclear Research and Consultancy Group, P.O. Box 25, NL-1755 ZG Petten, The Netherlands
⁴ Nuclear Data Section International Atomic Energy Agency, Wagramerstrasse 5, Vienna AT-1400, Austria
⁵ Nuclear Physics Department, Bucharest University, Bucharest-Magurele, Romania

^a e-mail: stephane.hilaire@cea.fr

Abstract

We review our calculated energy-, spin- and parity-dependent nuclear level densities based on the microscopic combinatorial model described in ref. [1]. We show that this model predicts the experimental sand p-wave neutron resonance spacings with a degree of accuracy comparable to that of the best global models available and also provides reasonable description of low energies cumulative number of levels as well as of the experimental data obtained by the Oslo group [2]. We also provide a renormalization recipe which enables to play with the tabulated results for practical applications. Finally, we study the impact of temperature dependent calculation on s-wave neutron resonance spacings.