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The Isotopic Composition of Cosmic Ray B, C, N, and O: Evidence for an Overabundance ^(18)O

Gibner, P. S. and Mewaldt, R. A. and Schindler, S. M. and Stone, E. C. and Webber, W. R. (1992) The Isotopic Composition of Cosmic Ray B, C, N, and O: Evidence for an Overabundance ^(18)O. Astrophysical Journal, 391 . L89-L92. ISSN 0004-637X. doi:10.1086/186405.

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New observations of galactic cosmic rays at higher energies (about 400-780 MeV nucleon^(-1)) than obtained in previous direct mass measurements have resulted in determinations of the isotopic composition of B, C, N, and O. The derived cosmic-ray source abundances provide evidence for an enhancement of ^(18)O/^(16)O by a factor of 5.6 ± 1.9 over the solar system value and give a ^(13)C/^(12)C ratio consistent with the solar system abundance ratio, but lower than some recent measurements of the local interstellar medium.

Item Type:Article
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URLURL TypeDescription
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Additional Information:Copyright 1992, American Astronomical Society. Received 1992 January 13; accepted 1992 March 12. This work was supported in part by NASA under grant NAGW-1919. We thank A. Buffington, D. Burke, E. Christian, J. Grove, I. Rasmussen, J. Weger, and the Caltech Central Engineering Services for their contributions to HEIST and the National Scientific Balloon Facility and NASA Wallops Flight Facility for their excellent support.
Group:Space Radiation Laboratory
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Space Radiation Laboratory1992-03
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ID Code:45674
Deposited By: Deborah Miles
Deposited On:12 May 2014 22:38
Last Modified:10 Nov 2021 17:15

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