Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..266w&link_type=abstract
Astrophysical Journal, Part 1, vol. 238, May 15, 1980, p. 266-286.
Astronomy and Astrophysics
Astrophysics
73
Isomerization, Nuclear Astrophysics, Nuclear Fusion, Stellar Structure, Thermalization (Energy Absorption), Aluminum 26, Chemical Equilibrium, Energy Levels, Magnesium Compounds, Nuclear Structure, Stellar Temperature
Scientific paper
The paper examines the mechanisms by which the isomeric states of nuclei formed during nucleosynthesis are brought into statistical thermal equilibrium with their ground states. Simple two level and three-level systems are studied, followed by a more generalized technique for a numerical investigation of the internal thermal equilibrium of the ground and isomeric states in many key nuclei with emphasis on Al-26. In particular, regimes characterized by specified time scales and temperatures are studied in which (1) the ground state and the isomer may be considered a thermal mixture, or (2) the ground state and the isomer must be treated as separate nuclear species. The internal equilibrium time scales are calculated as a function of stellar temperature for given initial rates at which the isomer and the ground state are populated by their source reactions.
Fowler William A.
Ward Richard A.
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