The isotopic composition of cosmic-ray B, C, N, and O - Evidence for an overabundance of O-18

Details The isotopic composition of cosmic-ray B, C, N, and O - Evidence for an overabundance of O-18 The isotopic composition of cosmic-ray B, C, N, and O - Evidence for an overabundance of O-18

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391l..89g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 391, no. 2, June 1, 1992, p. L89-L92. Research supported by Natio

Astronomy and Astrophysics

Astrophysics

18

Chemical Composition, Cosmochemistry, Galactic Cosmic Rays, Galactic Evolution, Nitrogen Isotopes, Oxygen Isotopes, Boron Isotopes, Carbon Isotopes, Interstellar Chemistry, Solar System

Scientific paper

New observations of galactic cosmic rays at higher energies (about 400-780 MeV/nucleon) than obtained in previous direct mass measurements have resulted in determinations of the isotopic composition of B, C, N, and O. The derived cosmic-ray source abundances provide evidence for an enhancement of O-18/O-16 by a factor of 5.6 +/- 1.9 over the solar system value and give a C-13/C-12 ratio consistent with the solar system abundance ratio, but lower than some recent measurements of the local interstellar medium.

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