Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...328..940k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 328, May 15, 1988, p. 940-953. Research supported by the Universities Space
Astronomy and Astrophysics
Astrophysics
38
Abundance, Boron Isotopes, Chemical Composition, Galactic Cosmic Rays, Interstellar Matter, Nitrogen Isotopes, Cross Sections, Galactic Evolution, Mass Distribution, Solar System
Scientific paper
Data from the high-energy cosmic-ray experiment on the ISEE 3 spacecraft have been used to obtain high-resolution measurements of the isotopic compositions of the elements boron and nitrogen and of the relative abundances of the elements B, C, N, and O in the cosmic rays arriving at Earth. These data cover the energy range ≡85 - 205 MeV amu-1. The authors find, relative to 16O, a 15N source abundance consistent with solar system composition, but a 14N source abundance which is a factor of ≡3 underabundant relative to the solar value. Recent measurements of relevant nuclear fragmentation cross sections make it unlikely that cross section errors could be responsible for this underabundance.
Krombel K. E.
Wiedenbeck Mark E.
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