Stone, E. C. and Wiedenbeck, M. E.
(1979)
A secondary tracer approach to the derivation of galactic cosmic-ray source isotopic abundances.
Astrophysical Journal, 231
.
pp. 606-623.
ISSN 0004-637X.
doi:10.1086/157222.
https://resolver.caltech.edu/CaltechAUTHORS:20140207-101218239
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Abstract
A formalism has been developed for deriving cosmic-ray source isotopic abundances from
observed local abundances using a purely secondary nuclide as a tracer of spallation production
during propagation. Although the formalism is based on the leaky-box model of cosmic-ray
propagation, it is shown that source abundances derived by the tracer technique are reasonably
independent of detailed propagation models. The tracer formalism also permits a quantitative
evaluation of the effects of observational uncertainties on deduced source abundances. It is shown
that statistical errors in the observed abundances and uncertainties in the spallation cross sections
are at present the dominant sources of uncertainty. The latter error can be reduced with increased
detector size or exposure time, while the former can be minimized by measurements of
the relative production cross sections. As a specific example, the tracer technique is applied to
the isotopes of sulfur and calcium, and the level of uncertainties which must be achieved to
distinguish evolutionary differences between solar-system material and cosmic ray-source
material are established.
Item Type: | Article |
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Additional Information: | © 1979 American Astronomical Society. Received 1978 November 3; accepted 1979 January 25. We appreciate discussion with M. Casse and comments on the manuscript by R. A. Mewaldt and J. F. Zumberge. This work was supported in part by the
National Aeronautics and Space Administration under
grant NGR 05-002-160. |
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Group: | Space Radiation Laboratory |
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Funders: | Funding Agency | Grant Number |
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NASA | NGR 05-002-160 |
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Subject Keywords: | cosmic rays: abundances; nuclear reactions |
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Other Numbering System: | Other Numbering System Name | Other Numbering System ID |
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Space Radiation Laboratory | 1978-03 |
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DOI: | 10.1086/157222 |
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Record Number: | CaltechAUTHORS:20140207-101218239 |
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Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140207-101218239 |
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Official Citation: | A secondary tracer approach to the derivation of galactic cosmic-ray source isotopic abundances
Stone, E. C. & Wiedenbeck, M. E.
Journal: Astrophysical Journal, Part 1, vol. 231, July 15, 1979, p. 606-623 |
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Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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ID Code: | 43719 |
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Collection: | CaltechAUTHORS |
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Deposited By: | INVALID USER |
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Deposited On: | 07 Feb 2014 18:34 |
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Last Modified: | 10 Nov 2021 16:42 |
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