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S-process krypton of variable isotopic composition in the Murchison meteorite

Ott, Ulrich and Begemann, Friedrich and Yang, Jongmann and Epstein, Samuel (1988) S-process krypton of variable isotopic composition in the Murchison meteorite. Nature, 332 (6166). pp. 700-702. ISSN 0028-0836. doi:10.1038/332700a0.

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Current theories on the origin of the chemical elements explain the abundance of medium-heavy and heavy nuclides to be due to the capture by pre-existing lighter nuclides of free neutrons on either a slow timescale (s-process) or a rapid timescale (r-process). Experimental evidence in support of these theories comes from the analysis of carbonaceous chondrites. In acid-resistant residues of these meteorites a kind of xenon has been found, the isotopic composition of which matches almost perfectly that predicted for s-process xenon. We report data that allow us, for the first time, to derive with reasonable precision the full isotopic spectrum of s-process krypton as well. We show that this s-Kr in a residue from Murchison meteorite did not originate in one single s-process but rather is a mixture of contributions from stellar environments where the density of free neutrons was not the same. The astrophysical conditions under which this krypton has been produced were distinct from those that have been invoked to explain the Solar System s-process abundance. Similar to the ^(13)C-rich carbon component in an aliquot of the same residue, the s-process Kr from different astrophysical sites has retained its identity during the accumulation and subsequent history of the meteorite.

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Additional Information:© 1988 Nature Publishing Group. Received 22 December 1987; accepted 22 February 1988. We thank Dr H. Beer for allowing us to use the results of his calculations for the isotope abundance ratios of s-Kr produced under different stellar conditions. Work at the California Institute of Technology was supported by a NASA grant no. NAG 9-46. J.Y. gratefully acknowledges financial support by the Korea Science and Engineering Foundation and by the Third World Academy of Sciences.
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Korea Science and Engineering FoundationUNSPECIFIED
Third World Academy of SciencesUNSPECIFIED
Issue or Number:6166
Record Number:CaltechAUTHORS:20140311-111920566
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Official Citation:S-process krypton of variable isotopic composition in the Murchison meteorite 700-702 Ulrich Ott, Friedrich Begemann, Jongmann Yang & Samuel Epstein doi:10.1038/332700a0
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44245
Deposited By: Ruth Sustaita
Deposited On:12 Mar 2014 15:38
Last Modified:10 Nov 2021 16:49

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