arXiv:astro-ph/9609012·v1·Astrophysics
Applicability Of The Hauser-Feshbach Approach For The Determination of Astrophysical Reaction Rates
T. Rauscher (1) · F.-K. Thielemann (1) · K.-L. Kratz (2) ((1) Univ. Basel, Switzerland, (2) Inst. f. Kernchemie, Mainz, Germany)
Abstract
Nuclear Astrophysics requires the knowledge of reaction rates over a wide range of nuclei and temperatures. In recent calculations the nuclear level density - as an important ingredient to the statistical model (Hauser-Feshbach) - has shown the highest uncertainties. In a back-shifted Fermi-gas formalism utilizing an energy-dependent level density parameter and employing microscopic corrections from a recent FRDM mass formula, we obtain a highly improved fit to experimental level densities. The resulting level density is used for determining criteria for the applicability of the statistical model on neutron-induced reactions.
Comments: 4 pages, uses espcrc1.sty, Proc. Intl. Conf. "Nuclei in the Cosmos IV", Univ. Notre Dame 1996, Nucl. Phys. A, in press. Postscript is also available at http://quasar.physik.unibas.ch/research.html