Computer Science – Numerical Analysis
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....97..157w&link_type=abstract
Astronomy and Astrophysics, vol. 97, no. 1, Apr. 1981, p. 157-168.
Computer Science
Numerical Analysis
8
Cosmic Plasma, Coulomb Collisions, Decay Rates, Nuclear Reactions, Nuclear Relaxation, Radioactive Decay, Reaction Kinetics, Carbon 12, Energy Levels, High Temperature Plasmas, Numerical Analysis, Stellar Temperature, Transition Probabilities
Scientific paper
The general problem of the electromagnetic de-excitation of nuclear excited states (for arbitrary types of multipole transitions) due to Coulomb collisions with the surrounding ions of a hot stellar plasma is considered. Approximate analytic expressions are developed for the de-excitation rates in the limiting cases of: (1) small nuclear transition energies and/or high stellar temperatures, and (2) large nuclear transition energies and/or low stellar temperatures. Numerical interpolation formulas are also given to cover the intermediate regions. The dependence of the de-excitation rates on the various internal nuclear parameters of the induced transition as well as on the external parameters describing the stellar environment is quantitatively shown. The resulting expressions are then used to calculate the stellar de-excitation rates of a wide variety of astrophysically important nuclear isomeric transitions.
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