Production of Li, Be, and B in the early Galaxy

Details Production of Li, Be, and B in the early Galaxy Production of Li, Be, and B in the early Galaxy

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385l..13s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 385, Jan. 20, 1992, p. L13-L16. Research supported by Max-Planck-

Astronomy and Astrophysics

Astrophysics

108

Beryllium, Boron, Galactic Evolution, Lithium, Milky Way Galaxy, Nuclear Astrophysics, Abundance, Chemical Composition, Cosmic Rays, Nuclear Fusion

Scientific paper

The production of lithium, beryllium, and boron via collisions between cosmic rays and interstellar gas nuclei during the early (Population II) evolution of the Galaxy is considered. There is a qualitative as well as quantitative difference from the usual (Population I) spallation production of these intermediate-mass nuclei. In particular, since Li-6 and Li-7 can be produced via alpha + alpha fusion reactions whereas Be-9, Be-10, and Be11 require CNO nuclei as spallation targets, the ratio of Li to Be or B is vastly different from that predicted in previous spallation calculations. Current data do not exclude (and may even support) the possibility that significant amounts of Li are produced through this mechanism and recently quoted constraints must be reconsidered in light of these results.

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