Samarium-146 in the early solar system - Evidence from neodymiun in the Allende meteorite

Details Samarium-146 in the early solar system - Evidence from neodymiun in the Allende meteorite Samarium-146 in the early solar system - Evidence from neodymiun in the Allende meteorite

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.

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