Combinatorial level densities from a relativistic structure model

DOI10.1016/S0375-9474(03)00614-6zbMATH Open1010.81516arXivnucl-th/0205068OpenAlexW1831982268MaRDI QIDQ1859841

Yanyan Li

Publication date: 19 February 2003

Published in: Nuclear Physics. A (Search for Journal in Brave)

Abstract: A new model for calculating nuclear level densities is investigated. The single-nucleon spectra are calculated in a relativistic mean-field model with energy-dependent effective mass, which yields a realistic density of single-particle states at the Fermi energy. These microscopic single-nucleon states are used in a fast combinatorial algorithm for calculating the non-collective excitations of nuclei. The method, when applied to magic and semi-magic nuclei, such as ${60}^{}$Ni, ${114}^{}$Sn and ${208}^{}$Pb, reproduces the cumulative number of experimental states at low excitation energy, as well as the s-wave neutron resonance spacing at the neutron binding energy. Experimental level densities above 10 MeV are reproduced by multiplying the non-collective level densities by a simple vibrational enhancement factor. Problems to be solved in the extension to open-shell nuclei are discussed

Full work available at URL: https://arxiv.org/abs/nucl-th/0205068

zbMATH Keywords

single-particle statesmean-field modelenergy-dependent effective mass

Mathematics Subject Classification ID

Nuclear physics (81V35)

Related Items (1)

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