The cosmic synthesis of lithium, beryllium and boron

Details The cosmic synthesis of lithium, beryllium and boron The cosmic synthesis of lithium, beryllium and boron

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987sciam.256...39v&link_type=abstract

Scientific American (ISSN 0036-8733), vol. 256, May 1987, p. 39-45.

Physics

Beryllium, Boron, Cosmic Dust, Cosmic Rays, Cosmochemistry, Lithium, Heavy Elements, Light Elements, Red Giant Stars, Solar System, Supernovae

Scientific paper

The synthesis of the three light elements in the collision of cosmic rays with low-density clouds of gas and dust permeating the Galaxy is discussed. The experimental testing of various mechanisms of producing lithium, beryllium, and boron by nuclear reactions is described, and it is shown how either the collision of light cosmic rays with heavy nuclei or heavy cosmic rays with light nuclei in the interstellar medium can form the light elements in the observed absolute abundances. The inability of the model to explain some observed ratios of light element abundances is discussed, and the implications of the light element abundances for the baryon density of the universe are considered.

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