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Primordial nucleosynthesis and the abundances of beryllium and boronThe recently attained ability to make measurements of Be and B as well as to put constraints on Li-6 abundances in metal-poor stars has led to a detailed reexamination of big bang nucleosynthesis in the A is greater than about 6 regime. The nuclear reaction network has been significantly expanded, with many new rates added. It is demonstrated that although a number of A is greater than 7 reaction rates are poorly determined, even with extreme values chosen, the standard homogeneous model is unable to produce significant yields above A = 7, and the (Li-7)/(Li-6) ratio always exceeds 500. We also preliminarily explore inhomogeneous models, such as those inspired by a first-order quark-hadron phase transition, where regions with high neutron/proton ratios can allow some leakage up to A is greater than 7. However, models that fit the A is not greater than 7 abundances still seem to have difficulty in obtaining significant A is greater than 7 yields.
Document ID
19930049516
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Thomas, David
(Chicago Univ. IL, United States)
Schramm, David N.
(Chicago Univ.; NASA/Fermilab Astrophysics Center Batavia, IL, United States)
Olive, Keith A.
(Minnesota Univ. Minneapolis, United States)
Fields, Brian D.
(Chicago Univ. IL, United States)
Date Acquired
August 16, 2013
Publication Date
April 1, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 406
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A33513
Funding Number(s)
CONTRACT_GRANT: DE-AC02-83ER-40105
CONTRACT_GRANT: NAGW-2381
Distribution Limits
Public
Copyright
Other

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