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Barites - Anomalous xenon from spallation and neutron-induced reactionsSedimentary barites from South Africa and Western Australia (about 3 billion years old) contain spallogenic Xe isotopes produced by reactions of Ba with nuclear-active particles in cosmic rays. 'Surface residence time' of these samples was calculated from the observed concentrations of spallogenic Xe-126. Comparison of spallogenic ratios of Xe-131/Xe-126 in the two samples provides evidence for the reaction Ba-130(n, gamma) yields Xe-131, which is characterized by a large number of resonances for neutron absorption in the epithermal region. This observation lends additional support to the conclusions already reached regarding the origin of anomalous Xe-131 in lunar samples.
Document ID
19760052678
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Srinivasan, B.
(California, University Berkeley, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
June 1, 1976
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 31
Issue: 1, Ju
Subject Category
Lunar And Planetary Exploration
Accession Number
76A35644
Funding Number(s)
CONTRACT_GRANT: ERDA 34P32-99
CONTRACT_GRANT: NGL-14-001-010
Distribution Limits
Public
Copyright
Other

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