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Hadrons and Nuclei


Eur. Phys. J. A 12, 169-184 (2001)

Combinatorial nuclear level densities based on the Gogny nucleon-nucleon effective interaction

S. Hilaire, J.P. Delaroche and M. Girod

Commissariat à l'Energie Atomique, Service de Physique Nucléaire, Boîte Postale 12, 91680 Bruyères-le-Châtel, France

stephane.hilaire@cea.fr

(Received: 13 February 2001 / Revised version: 17 September 2001 Communicated by P. Schuck)

Abstract
A combinatorial method to calculate total level densities from an arbitrary single-particle level scheme is presented. Parity, angular momentum, pairing correlations as well as collective enhancements are explicitly treated. This method is employed using single-particle level schemes obtained from Hartree-Fock-Bogoliubov calculations based on the Gogny effective interaction. Sixty five even-even nuclei with masses $26 \leq A \leq 250$ are considered. Rather good agreements are obtained when comparing our predictions with experimental data for energies of the order of the neutron binding energies and for low excitation energies where discrete levels are experimentally observed.

PACS
24.10.Pa - Thermal and statistical models.
21.60.Jz - Hartree-Fock and random-phase approximations.
21.10.Re - Collective levels.

© Società Italiana di Fisica, Springer-Verlag 2001