Explosive He4 burning. I - Kinetics of burning at constant temperature and density

Details Explosive He4 burning. I - Kinetics of burning at constant temperature and density Explosive He4 burning. I - Kinetics of burning at constant temperature and density

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985afz....23..605k&link_type=abstract

(Astrofizika, vol. 23, Nov.-Dec. 1985, p. 605-619) Astrophysics (ISSN 0571-7132), vol. 23, no. 3, May 1986, p. 724-732. Translat

Astronomy and Astrophysics

Astrophysics

4

Helium Isotopes, Nuclear Fusion, Supernovae, Thermonuclear Explosions, White Dwarf Stars, Density Distribution, Heavy Nuclei, Nuclides, Reaction Kinetics, Stellar Composition, Temperature Dependence

Scientific paper

The kinetics of He-4 burning at a constant temperature above 10 to the 9th K and a constant density above 100,000 g/cu cm is studied. The reaction scheme and calculative method are described, and the regions of formation of iron group elements and lighter nuclides during He-4 burning are indicated in the density-temperature plane. The dependence of the mean atomic number of the nuclides formed on the temperature and the density is determined. At the first stage, the main He-4 reserves are exhausted and a strongly nonequilibrium isotopic composition is formed. In the second stage, the state of nuclear statistical equilibrium is established over times appreciably exceeding that of the first stage and with an order of magnitude the same as that of corresponding characteristic times for C-12, O-16, and Si-28. At temperatures of 4 billion K or higher, the role of the (alpha, n) reaction becomes important and a neutron flash occurs whose duration and intensity depend on the relationship between temperature and density.

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