Primordial Xe-129 in meteorites

Details Primordial Xe-129 in meteorites Primordial Xe-129 in meteorites

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..31...15d&link_type=abstract

Earth and Planetary Science Letters, vol. 31, no. 1, June 1976, p. 15-30.

Computer Science

13

Chondrites, Isotope Effect, Meteoritic Composition, Xenon Isotopes, Xenon 129, Fission Products, Mass Ratios, Mass Spectroscopy, Neutron Irradiation, Temperature Effects, Uranium 235

Scientific paper

Results are reported for xenon isotopic analysis, by stepwise heating, of two neutron-irradiated chondrites, Arapahoe and Bjurbole. The procedures used for decomposing the observed gas into various components are outlined, including the blank, spallation, and fission corrections. Iodine-xenon dating indicates that Arapahoe formed about 9.9 million years before Bjurbole, giving Arapahoe the most ancient formation age yet observed for a meteorite. The composition of trapped xenon in Arapahoe is found to be normal except for a deficiency of Xe-129; a Xe-129/Xe-132 ratio is inferred which is substantially lower than the apparent value for the primordial solar system. It is argued that the trapped xenon in this chondrite could not have been derived from solar xenon because no nuclear process is known which will selectively destroy Xe-129. Instead, it is proposed that r-process products at mass 129 condensed into dust as I-129 before decay into Xe-129 and that Arapahoe's parent body formed in a region of the solar system substantially depleted of this dust before any isotopic homogeneization could be effected by vaporization of the remaining dust.

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