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

Abstract

view Abstract Citations (115) References (38) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Astrophysical production rates for Li, Be, and B isotopes from energetic H(1) and He(4) reactions with HeCNO nuclei Walker, T. P. ; Viola, V. E. ; Mathews, G. J. Abstract 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. Publication: The Astrophysical Journal Pub Date: December 1985 DOI: 10.1086/163740 Bibcode: 1985ApJ...299..745W Keywords: Beryllium; Big Bang Cosmology; Boron; Cosmochemistry; Lithium; Nuclear Fusion; Abundance; Galactic Cosmic Rays; Helium Isotopes; Interstellar Matter; Nuclear Astrophysics; Shock Waves; Astrophysics full text sources ADS |