Computer Science
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.102..167h&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 102, no. 2, Feb. 1991, p. 167-177.
Computer Science
4
Achondrites, Meteoritic Composition, Rare Earth Elements, Spallation, Xenon, Cosmic Rays, Geochronology, Isotopes, Trace Elements, Meteorites, Angrites, Comparisons, Samples, Meteorite, Xenon, Origin, Laboratory Studies, Lew 86010, Lew Meteorites, Antarctic Meteorites, Angra Dos Reis, Abundance, Isotopes, Origin, Formation, Spallation, Fission, Plutonium 244, Rare Earth Elements, Barium, Exposure, Data, Irradiation, Achondrites, Stony Meteorites, Procedure, Trapping, Chemistry, Xenon 129, Fractionation, Par
Scientific paper
Results 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.
Bernatowicz Thomas J.
Hohenberg Charles M.
Podosek Frank A.
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