Astrophysical production rates for Li, Be, and B isotopes from energetic H(1) and He(4) reactions with HeCNO nuclei

Details Astrophysical production rates for Li, Be, and B isotopes from energetic H(1) and He(4) reactions with HeCNO nuclei Astrophysical production rates for Li, Be, and B isotopes from energetic H(1) and He(4) reactions with HeCNO nuclei

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...299..745w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 299, Dec. 15, 1985, p. 745-751. DOE-supported research.

Astronomy and Astrophysics

Astrophysics

96

Beryllium, Big Bang Cosmology, Boron, Cosmochemistry, Lithium, Nuclear Fusion, Abundance, Galactic Cosmic Rays, Helium Isotopes, Interstellar Matter, Nuclear Astrophysics, Shock Waves

Scientific paper

Calculations for Li, Be, and B nucleosynthesis in reactions of energetic 1H and 4He nuclei with 4He, 12,13C, 14N, and 16O nuclei have been performed. The calculations employed a recent compilation of cross section systematics for these reactions. Specific models examined include galactic cosmic-ray interactions with the interstellar medium, synthesis in flares, and formation in shock waves. The GCR + ISM calculations are able to account for the absolute abundances of 6Li, 9Be, 10B, and 11B satisfactorily, but require a low-energy component of spectral form E-γ to account for the 11B/10B isotopic ratio, where γ = 5-7. In these calculations 7Li is underproduced by an order of magnitude. The required 7Li is most probably provided by the big bang, an assumption that is consistent with an open universe. Synthesis solely in a flare mechanism cannot reproduce the observed relative abundances. The shock wave mechanism can account for the relative abundances, but only in a very narrow energy window near E/A = 10 MeV.

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