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Cosmic-ray models for early Galactic Lithium, Beryllium, and Boron productionTo understand better the early Galactic production of Li, Be, and B by comsmic-ray spallation and fusion reactions, the dependence of these production rates on cosmic-ray models and model parameters is examined. The sensitivity of elemental and isotopic production to the cosmic-ray path length magnitude and energy dependence, source spectrum, spallation kinematics, and cross section uncertainties is studied. Changes in these model features, particularly those features related to confinement, are shown to alter the Be- and B- versus-Fe slopes from a naive quadratic relation. The implications of our results for the diffuse gamma-ray background are examined, and the role of chemical evolution and its relation to our results is noted. It is also noted that the unmeasured high-energy behavior of alpha + alpha fusion can lead to effects as large as a factor of 2 in the resultant yields. Future data should enable Population II Li, Be, and B abundances to constrain cosmic-ray models for the early Galaxy.
Document ID
19950036452
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Fields, Brian D.
(Univ. of Chicago, Chicago, IL United States)
Olive, Keith A.
(Univ. of Minnesota, Minneapolis, MN United States)
Schramm, David N.
(Univ. of Chicago, Chicago, IL United States)
Date Acquired
August 16, 2013
Publication Date
November 1, 1994
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 435
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
95A68051
Funding Number(s)
CONTRACT_GRANT: NAGW-2381
CONTRACT_GRANT: DE-AC02-93ER-40105
Distribution Limits
Public
Copyright
Other

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