Interactive web tools for a modified Hauser-Feshbach formalism

Details Interactive web tools for a modified Hauser-Feshbach formalism Interactive web tools for a modified Hauser-Feshbach formalism

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..apr.t7012g&link_type=abstract

American Physical Society, April Meeting, 2003, April 5-8, 2003 Philadelphia, Pennsylvania, MEETING ID: APR03, abstract #T7.012

Astronomy and Astrophysics

Astrophysics

Scientific paper

The treatment of excited states of nuclei in astrophysical rate calculations has traditionally relied on the Hauser-Feshbach formalism. The assumption is that thermalization has occured, which may not be valid if the presence of a low-lying isomer necessitates investigation into the nonequilibrium behavior of the nucleus under realistic stellar conditions. A technique for appropriately splitting such nuclei into interacting ensembles which are in equilibrium throughout the evolution is presented. The technique is used in consonance with the Hauser-Feshbach formalism to track the effective internal transition and the decay/capture rates of nuclei when they are not in equilibrium. Finally we transform the ENSDF online datasets into machine-readable format and allow the interactive calculation of rates for user-selected combinations of experimental and theoretical data pertaining to nuclei upto A=250. Theoretical level densities from the Intitute of Astrophysics (Brussels) are used to supplement the ENSDF experimental level-schemes. An interactive website is presented to display the formalism as implemented for beta decays of nuclei important to astrophysics.

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