Statistics – Computation
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...326..196b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 326, March 1, 1988, p. 196-207.
Statistics
Computation
47
Nuclear Fusion, Stellar Composition, Stellar Evolution, Abundance, Asymptotic Giant Branch Stars, Magnesium, Neon, Reaction Kinetics, Stellar Models
Scientific paper
The problem of n-capture nucleosynthesis in intermediate-mass stars during the thermal instabilities of the He shell is reanalyzed in the light of an updated set of cross sections for n-captures and of reaction rates for alpha reactions. The reaction network used in the calculations is sketched and inserted into models of thermal phases derived from new evolutionary computations for a Population II star developing an H-exhausted core of 1.07 solar mass and from published data on Population I He-shell instabilities. The computations invariably lead to strongly nonsolar distributions of s-elements. In the majority of cases, high neutron densities are found, implying the saturation of many s-branches and the production of r-isotopes. The reaction Ne-22 (alpha, n) Mg-25 probably cannot give rise to a solar distribution of s-nuclei.
Busso Maurizio
Chieffi Alessandro
Gallino Roberto
Picchio G.
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