Allende Meteorite: Isotopically Anomalous Xenon is Accompanied by Normal Osmium

Details Allende Meteorite: Isotopically Anomalous Xenon is Accompanied by Normal Osmium Allende Meteorite: Isotopically Anomalous Xenon is Accompanied by Normal Osmium

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976pnas...73.4253t&link_type=abstract

Proceedings of the National Academy of Sciences of the United States of America, Volume 73, Issue 12, pp. 4253-4256

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Scientific paper

The 184Os/190Os ratio of six Allende meteorite samples was determined by neutron activation analysis. Four chromite concentrates gave a ratio differing from the terrestrial ratio by only -0.1 ± 0.4%, although they contained highly anomalous xenon enriched by up to 67% in 124Xe and 93% in 136Xe. In view of this result and the normal isotopic composition of carbon and oxygen in these fractions, it seems very unlikely that the xenon anomalies were produced in a supernova by the p and r processes. More probably, the xenon anomalies were established in the early solar system, by mass fractionation during trapping of noble gases in solids and by spontaneous fission of a superheavy element. Two other samples, containing osmium from the calcium, aluminum-rich inclusions, also gave an 184Os/190Os ratio within -0.1 ± 0.5% of the terrestrial value, although these inclusions show well-established anomalies in the light elements oxygen and magnesium, which appear to be due to pre-solar dust grains of distinctive nuclear history. Apparently the stellar source of the anomalous oxygen and magnesium did not synthesize heavier elements.

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