Naslov
Combinatorial level densities from a relativistic structure model

Autori
Pezer, Robert ; Ventura, Alberto ; Vretenar, Dario

Izvornik
Nuclear Physics A (0375-9474) 717 (2003), 1-2; 21-43

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Nuclear level densities; Self-consistent relativistic models; Combinatorial methods; Vibrational enhancement

Sažetak
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 60Ni, 114Sn and 208Pb, 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA