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The isotopic composition of cosmic-ray B, C, N, and O: Evidence for an overabundance of ^(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 of ^(18)O. Astrophysical Journal, 391 (2). L89-L92. ISSN 0004-637X. doi:10.1086/186405.

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New observations of galactic cosmic rays at higher energies (~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
Related URLs:
URLURL TypeDescription DOIArticle
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Additional Information:© 1992 The 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
Funding AgencyGrant Number
Subject Keywords:cosmic rays - Galaxy: abundances
Issue or Number:2
Record Number:CaltechAUTHORS:20140212-085401267
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43791
Deposited By: Tony Diaz
Deposited On:13 Feb 2014 21:53
Last Modified:10 Nov 2021 16:43

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