Carbon, nitrogen and oxygen isotopes in the low energy galactic cosmic rays

Astronomy and Astrophysics – Astronomy

Scientific paper

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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.

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