Cosmic-ray nucleosynthesis and the infall rate of extragalactic matter in the solar neighborhood

Details Cosmic-ray nucleosynthesis and the infall rate of extragalactic matter in the solar neighborhood Cosmic-ray nucleosynthesis and the infall rate of extragalactic matter in the solar neighborhood

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226..613r&link_type=abstract

Astrophysical Journal, Part 1, vol. 226, Dec. 1, 1978, p. 613-631.

Astronomy and Astrophysics

Astrophysics

71

Abundance, Cosmic Rays, Galactic Evolution, Intergalactic Media, Nuclear Fusion, Beryllium 9, Boron Isotopes, Carbonaceous Chondrites, Hydrogen Atoms, Lithium Isotopes, Meteoritic Composition, Spallation

Scientific paper

An up-to-date discussion of the galactic abundances of lithium, beryllium, and boron is presented. The observed galactic abundances of these elements remain surprisingly constant in time, at values significantly lower than predictions made by conventional models of closed galactic evolution. This fact suggests that intergalactic hydrogen may enter our neighborhood. A local infall rate of about 2 solar masses per billion years per sq pc is favored; the rather large uncertainties in this rate are discussed. The measured ratios of element and isotope abundances among the light elements suggest that the average energy spectrum of fast particles in our galactic neighborhood turns up below 50-100 MeV per nucleon. Such a turnup implies that two source families for cosmic rays must exist, perhaps supernovae and ordinary stars. In carbonaceous chondrites, not only boron, but apparently also beryllium and perhaps even lithium, seem to be enriched beyond their stellar abundance values. And even after many years of study, the origin of Li-7 remains uncertain.

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