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Published December 1, 1981 | Published
Journal Article Open

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


We report new high resolution measurements of the elemental and isotopic composition of galactic cosmic ray B, C, N, and O nuclei with ~ 30 to ~ 130 MeV nucleon^(-1). These observations place limits on the isotopic composition of the cosmic ray source and restrict possible models of cosmic ray origin and propagation. In particular, we find that N is significantly depleted in the cosmic ray source with respect to the solar system and local interstellar medium, a result inconsistent with models in which a majority of cosmic rays are accelerated interstellar medium material.

Additional Information

© 1981 The American Astronomical Society. Received 1981 June 29; accepted 1981 August 13. We thank M. E. Wiedenbeck for the use of his cosmic ray propagation calculations and for discussions of their interpretation. This work was supported in part by NASA under contract NAS 5-20721 and grant NGR 05-002-160.

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Published - 1981ApJ___251L__27M.pdf


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