MOLYBDENUM ISOTOPIC COMPOSITION OF INDIVIDUAL PRESOLAR SILICON CARBIDE GRAINS FROM THE MURCHISON METEORITE - ISOTOPIC COMPOSITION OF NEON, XENON, SILICON, CARBON, AND NITROGEN
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dc.contributor.author | Nicolussi G.K. | |
dc.contributor.author | Pellin M.J. | |
dc.contributor.author | Lewis R.S. | |
dc.contributor.author | Davis A.M. | |
dc.contributor.author | Amari S. | |
dc.contributor.author | Clayton R.N. | |
dc.date.accessioned | 2020-12-29T04:11:25Z | |
dc.date.available | 2020-12-29T04:11:25Z | |
dc.date.issued | 1998 | |
dc.identifier | https://elibrary.ru/item.asp?id=59374 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1998, , 6, 1093-1104 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/21568 | |
dc.description.abstract | We report the isotopic composition of molybdenum in twenty-three presolar SiC grains from the Murchison meteorite which have been measured by resonant ionization mass spectrometry (RIMS). Relative to terrestrial abundance (and normalized to s-process-only 96Mo), the majority of the analyzed grains show strong depletions in the p-process isotopes 92Mo and 94Mo and the r-process isotope 100Mo. Sixteen of these grains have δ-values <-600% for these three isotopes. The observed isotopic patterns of Mo from mainstream SiC grains clearly reveal the signature of s-process nucleosynthesis. Three-isotope plots of all grain data (δiMo vs. δ92Mo) show strong linear correlations with characteristic slopes. This finding suggests mixing of solar-like material and pure s-process material in the parent stars. Comparison with evolutionary calculations of nucleosynthesis and mixing in red giants suggests that low-mass thermally-pulsed symptotic giant branch (TP-AGB) stars are the most likely site for the observed s-process nucleosynthesis. | |
dc.title | MOLYBDENUM ISOTOPIC COMPOSITION OF INDIVIDUAL PRESOLAR SILICON CARBIDE GRAINS FROM THE MURCHISON METEORITE - ISOTOPIC COMPOSITION OF NEON, XENON, SILICON, CARBON, AND NITROGEN | |
dc.type | Статья |
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