Microscopic Nuclear Level Densities by the Shell Model Monte Carlo Method

Details Microscopic Nuclear Level Densities by the Shell Model Monte Carlo Method Microscopic Nuclear Level Densities by the Shell Model Monte Carlo Method

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cgrs.conf..373a&link_type=abstract

CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS. Proceedings of the Eleventh International Symposium. Held 2-6 September 2002

Physics

Scientific paper

We have used quantum Monte Carlo methods to calculate microscopically level densities in large model spaces within the framework of the interacting shell model. Calculated densities for A ~ 50 - 70 nuclei are in remarkably good agreement with experimental level densities and an improvement over empirical formulas. Nevertheless, current Monte Carlo calculations are limited to temperatures below ~ 1.5 - 2 MeV. We have recently introduced a framework that accounts for the full single-particle model space (bound states plus continuum) together with interaction effects in the truncated space. We find that the backshifted Bethe formula is valid in a larger temperature range (i.e., up to ~ 4 MeV). A signature of the pairing phase transition is clearly seen in the heat capacity of even-even nuclei.

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