Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icrc....1..401g&link_type=abstract
In: International Cosmic Ray Conference, 16th, Kyoto, Japan, August 6-18, 1979, Conference Papers. Volume 1. (A81-12386 02-93) T
Astronomy and Astrophysics
Astronomy
Abundance, Carbon Isotopes, Cosmic Rays, Nitrogen Isotopes, Oxygen Isotopes, Solar Activity Effects, Energy Spectra, Explorer 47 Satellite, Galactic Radiation, Mass Ratios, Spaceborne Astronomy
Scientific paper
The isotopes of C, N, and O in the galactic cosmic rays were measured in the 45-106 Mev/nucleon range with data collected during 1973-77 by the cosmic-ray telescope onboard the IMP-7 spacecraft. The ratios of (N-15)/N, (C-13)/C, and ((O-18)/O agreed with previous measurements. Cosmic ray propagation and solar modulation indicate that the measured N isotopic ratio is in agreement with a source ratio of (N-14)/O = 0.03, which is much lower than the solar system abundance ratio.
Garcia-Munoz Manuel
Guzik Greg T.
Simpson André J.
Wefel John P.
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