High-resolution observations of the isotopic composition of carbon and silicon in the galactic cosmic rays

Astronomy and Astrophysics – Astrophysics

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Carbon Isotopes, Chemical Composition, Cosmic Rays, Galactic Radiation, Satellite Observation, Silicon Isotopes, Abundance, Mass Distribution, Mass Ratios, Molecular Spectroscopy, Spectral Resolution

Scientific paper

High resolution satellite observations of the galactic cosmic rays (approximately 100-300 MeV/amu) have yielded determinations of near-earth isotopic compositions, which are presented: (C-13)/(C-12) = 0.070 + or - 0.006; (Si-29)/(Si-28) = 0.109(+0.024, -0.014); and (Si-30)/(Si-28) = 0.084(+0.020, -0.014). Using a standard propagation model, source values greater than solar are derived for each of these ratios. The (C-13) excess may be the result of cross section uncertainties, but the (Si-29) and (Si-30) appear to reflect real differences between the galactic cosmic-ray source and the solar system.

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