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

Journal Article · Sun Dec 15 04:00:00 EST 1985 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/163740· OSTI ID:5961954

Walker, T P; Mathews, G J; Viola, V E

Calculations for Li, Be, and B nucleosynthesis in reactions of energetic /sup 1/H and /sup 4/He nuclei with /sup 4/He, /sup 12,13/C, /sup 14/N, and /sup 16/O nuclei have been performed. The calculations employed a recent compilation of cross section systematics for these reactions. Spcific models examined include galactic cosmic-ray interactions with the interstllar medium, synthesis in flares, and formation in shock waves. The GCR+ISM calculations are able to account for the absolute abundances of /sup 6/Li, /sup 9/Be, /sup 10/B, and /sup 11/B satisfactorily, but require a low-energy component of spectral form E/sup -//sup ..gamma../ to account for the /sup 11/B//sup 10/B isotopic ratio, where ..gamma.. = 5--7. In these calculations /sup 7/Li is underproduced by an order of magnitude. The required /sup 7/Li is most probably provided by the big bang, and 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 window near E/A = 10 MeV.

• Research Organization: Department of Astronomy, Indiana University
• OSTI ID: 5961954
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 299:2; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ALKALI METALS
ALKALINE EARTH METALS
ALPHA REACTIONS
BARYON REACTIONS
BERYLLIUM
BORON
CARBON 12 TARGET
CARBON 13 TARGET
CHARGED-PARTICLE REACTIONS
COSMIC RADIATION
COSMOLOGY
CROSS SECTIONS
ELEMENTS
EXCITATION FUNCTIONS
FUNCTIONS
HADRON REACTIONS
HELIUM 4 TARGET
INTERSTELLAR SPACE
IONIZING RADIATIONS
ISOTOPE RATIO
LITHIUM
METALS
NITROGEN 14 TARGET
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEOSYNTHESIS
OXYGEN 16 TARGET
PROTON REACTIONS
RADIATIONS
SEMIMETALS
SHOCK WAVES
SPACE
STELLAR ACTIVITY
STELLAR FLARES
SYNTHESIS
TARGETS