Computer Science
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983sci...222.1015l&link_type=abstract
Science (ISSN 0036-8075), vol. 222, Dec. 2, 1983, p. 1015-1018.
Computer Science
34
Meteoritic Composition, Neodymium Isotopes, Samarium Isotopes, Solar System, Alpha Decay, Chemical Evolution, Nuclear Fusion, Meteorites, Allende, Isotopes, Samarium 146, Neodymium, Formation, Data, Solar System, Carbon, Chromite, C3V Chondrites, Carbonaceous Chondrites, Enrichment, Nuclei, Gains, Abundance, Models, Hypotheses, Strontium, Nucleosynthesis
Scientific paper
A carbon-chromite fraction from the Allende C3V chondrite shows strikingly large isotopic enrichments of neodymium-142 (0.47 percent) and neodymium-143 (36 percent). Both apparently formed by alpha decay of samarium-146 and samarium-147 (half-lives 1.03 x 10 to the 8th and 1.06 x 10 to the 11th years), but the isotopic enrichment was greatly magnified by recoil of residual nuclei into a carbon film surounding the samarium-bearing grains. These data provide an improved estimate of the original abundance of extinct samarium-146 in the early solar system, Sm-146/Sm-144 = (4.5 + or - 0.5) x 10 to the -3rd, higher than predicted by some models of p-process nucleosynthesis. It may be possible to use this isotopic pair as a chronometer of the early solar system.
Anders Edward
Lewis Reed S.
Lugmair Guenter W.
Shimamura Tadashi
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