1993
DOI: 10.1086/172756
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S-process BA isotopic compositions in presolar SiC from the Murchison meteorite

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Cited by 85 publications
(83 citation statements)
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“…Quite similar isotope variations for noble gases are observed in presolar diamonds (Verchovsky et al 1998) and SiC (Lewis et al 1994) grain-size fractions, as well as for Ba (Zinner, Amari & Lewis 1991;Prombo, Podosek, Amari et al 1993) and Sr (Prombo, Podosek, Amari et al 1992) in SiC grains. Thus, through measurements of the grain size and isotopic compositions of samples representing a collection of grains irradiated in space, it is possible to identify different implanted components provided their implantation energies are not identical, and also to calculate the implantation energies.…”
Section: Isotope Effectssupporting
confidence: 53%
“…Quite similar isotope variations for noble gases are observed in presolar diamonds (Verchovsky et al 1998) and SiC (Lewis et al 1994) grain-size fractions, as well as for Ba (Zinner, Amari & Lewis 1991;Prombo, Podosek, Amari et al 1993) and Sr (Prombo, Podosek, Amari et al 1992) in SiC grains. Thus, through measurements of the grain size and isotopic compositions of samples representing a collection of grains irradiated in space, it is possible to identify different implanted components provided their implantation energies are not identical, and also to calculate the implantation energies.…”
Section: Isotope Effectssupporting
confidence: 53%
“…A seeond problem, which requires aeeurate cross sections, is related to the !arge isotopic anomalies in barium, whieh were reeently diseovered in SiC grains, a very resistant fraction of earbonaeeous ehondrite meteorites [7][8] [9]. If these anomalies are interpreted as being clue to an admixture of pure s-process barium to the ordinary solar system abundances, the expectecl yields, N s, have to be known reliably.…”
Section: Introductionmentioning
confidence: 99%
“…Silicon isotopic ratios in mainstream, Y and Z grains show a systematic trend. First, average 29 Si/ 28 Si ratios systematically decrease from mainstream Bulk analyses of SiC-rich fractions show that they are enriched in s-process Kr [26][27][28], Xe [27,28], Sr [29], Ba [30][31][32], Nd and Sm [31]. Since the majority of SiC grains are mainstream grains, the s-process enrichments were most likely carried by mainstream grains.…”
Section: Silicon Carbidementioning
confidence: 99%