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Comparative xenology of two angritesResults are presented on Xe analysis during stepwise heating of the angrite meteorite Lewis Cliff 86010 and the Angra dos Reis angrite. It is shown that both the Lewis Cliff and the Angra dos Reis angrites are poor in trapped Xe and are rich in fission Xe from Pu-244 and in spallation Xe produced by cosmic ray irradiation of Ba and the light REE, and that neither meteorite has an excess of Xe-129 derived from I-129. Both meteorites show significant variations in the composition of the spallation Xe attributable to the separation of the Ba and REE components. The Ba-related spallation in Lewis Cliff differs from that in Angra dos Reis primarily in a lower relative yield of the neutron-sensitive Xe-131 isotope, suggesting a lower neutron flux during cosmic ray exposure for the Lewis Cliff meteorite.
Document ID
19910045776
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hohenberg, Charles M.
(Washington Univ. Saint Louis, MO, United States)
Bernatowicz, Thomas J.
(Washington Univ. Saint Louis, MO, United States)
Podosek, Frank A.
(Washington University Saint Louis, MO, United States)
Date Acquired
August 14, 2013
Publication Date
February 1, 1991
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 102
Issue: 2 Fe
ISSN: 0012-821X
Subject Category
Lunar And Planetary Exploration
Accession Number
91A30399
Funding Number(s)
CONTRACT_GRANT: NAG9-252
CONTRACT_GRANT: NAG9-7
Distribution Limits
Public
Copyright
Other

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