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Isotopic composition of cosmic-ray boron and nitrogenNew measurements of the cosmic-ray boron and nitrogen isotopes at earth and of the elemental abundances of boron, carbon, nitrogen, and oxygen are presented. A region of mutually allowed values for the cosmic-ray nitrogen source ratios is determined, and the cosmic-ray escape mean free path is determined as a function of energy using a leaky box model for cosmic-ray propagation in the Galaxy. Relative to O-16, a N-15 source abundance consistent with solar system composition and a N-14 source abundance which is a factor of about three underabundant relative to the solar value are found.
Document ID
19880049595
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Krombel, K. E.
(Chicago Univ. Chicago, IL, United States)
Wiedenbeck, M. E.
(Chicago, University IL, United States)
Date Acquired
August 13, 2013
Publication Date
May 15, 1988
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 328
ISSN: 0004-637X
Subject Category
Space Radiation
Accession Number
88A36822
Funding Number(s)
CONTRACT_GRANT: NAG5-308
CONTRACT_GRANT: NAS5-20995
Distribution Limits
Public
Copyright
Other

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