Production of Li, Be, and B at low energies. [Mechanisms]

TL;DRAbstract

Relative yields of LiBeB isotopes are calculated for proton and ..cap alpha..-particle induced reactions at energies in the neighborhood of ten or tens of MeV, and comparisons are made with solar system abundances. A match is found for incident particles in the neighborhood of 16 MeV, assuming the meteoritic value for the B abundance and standard values for other target and product abundances. To obtain matches to a lower than meteoritic B abundance or for protons and ..cap alpha.. particles at the same energy per nucleon, it is found necessary to alter the initial abundance assumptions or assume selective destruction. The range of possible fits suggests that the nuclear cross sections do not preclude each of the LiBeB isotopes being produced mainly in reactions at the relatively low energies considered here.

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