The isotropic composition of cosmic ray B, C, N, and O nuclei

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Abundance, Cosmic Rays, Galactic Radiation, Heavy Nuclei, Interstellar Matter, Isotopes, Boron, Carbon, High Resolution, Nitrogen, Nuclear Fusion, Oxygen, Solar System

Scientific paper

High resolution measurements are presented for the elemental and isotopic composition of galactic cosmic ray B, C, N, and O nuclei with about 30-130 MeV/nucleon. The isotopes are separately resolved, and the resulting abundances are limited by statistical rather than systematic uncertainties. N is found to be significantly depleted in the cosmic ray source with respect to the solar system and local interstellar medium, and it is concluded that the N-14/O-16 limit is inconsistent with models in which a majority of cosmic rays are accelerated interstellar material.

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