Allende meteorite: Isotopically anomalous xenon is accompanied by normal osmium
AUTOR(ES)
Takahashi, H.
RESUMO
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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=431426Documentos Relacionados
- THE UNEXTRACTABLE ORGANIC FRACTION OF THE PUEBLITO DE ALLENDE METEORITE: EVIDENCE FOR ITS INDIGENOUS NATURE*
- The Buritizal meteorite: classification of a new Brazilian chondrite
- OZONOLYSIS OF “POLYMER-TYPE” MATERIAL IN COAL, KEROGEN AND IN THE ORGUEIL METEORITE: A PRELIMINARY REPORT*
- Escherichia coli RNA polymerase translocation is accompanied by periodic bending of the DNA.
- Loss of transcriptional activity of a transgene is accompanied by DNA methylation and histone deacetylation and is prevented by insulators