Plutonium-244 fission xenon and primordial xenon in the Allende meteorite |
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Authors: | P K Kuroda W A Myers |
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Institution: | (1) 4191 Del Rosa Court, 89121 Las Vegas, Nevada, USA;(2) Department of Chemical Engineering, University of Arkansas, 72701 Fayetteville, Arkansas, USA |
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Abstract: | The carbonaceous chondrite Allende contains (22±1)·10−12 cm3STP/g of244Pu fission xenon and two kinds of primordial xenon: Type I and Type II. The former represents the isotopic composition of
a primordial xenon, which resided in the vicinity of a supernova shortly before it exploded, while the latter represents that
of the xenon, which resided in the supernova. The isotopic composition of xenon found in the pink inclusion of the Allende
meteorite, corrected for the presence of very large excesses of244Pu fission xenon,129Xe from the decay of129I, and of128Xe from the neutron-capture reactions on127I, resembles that of Type-I primordial xenon. The isotopic composition of xenon found in the diamond inclusions of the Allende
meteorite, on the other hand, represents that of Type-II primordial xenon and it resembles that of a mixture of Type-I primordial
xenon whose isotopic composition is severely altered by a combined effect of (a) mass-fractionation, (b) spallation, (c) stellar-temperature
neutron-capture reactions, and (d) the presence of a large excess of244Pu fission xenon. |
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