Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..417a&link_type=abstract
Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 417-428.
Astronomy and Astrophysics
Astrophysics
54
Neon Isotopes, Neutron Distribution, Nuclear Fusion, Red Giant Stars, Temperature Effects, Helium, Neutron Cross Sections, Neutron Sources, Statistical Distributions, Stellar Models, Stellar Oscillations
Scientific paper
The neutron source of the s-process is believed to be the 22Ne(α, n) reaction, taking place in the He-burning shell of a pulsating red giant. Such a periodic neutron irradiation leads to an exponential distribution of neutron fluences for the seed nuclei, which can be deduced from the observed solar system abundances. Using this empirically determined distribution of neutron fluences and the abundances and the experimental cross sections of the elements present in the He shell, the number of neutrons captured by each nuclear species during the s-process has been calculated. The authors have measured the capture cross sections of the three stable neon isotopes in the energy range 5-400 keV; the total cross sections were also measured, between 5 and 800 keV. It is concluded that the traditional s-process treatment of the neutron balance yields strong evidence in favor of the 22Ne(α,n) reaction as the effective neutron source to build most s-process abundances.
Almeida Javier
Kaeppeler Franz
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