2004
DOI: 10.1086/382650
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s‐Process Sr Isotopic Compositions in Presolar SiC from the Murchison Meteorite

Abstract: We have used thermal ionization mass spectrometry to measure the isotopic compositions of Sr in size-sorted samples (the KJ series) of interstellar SiC separated from the Murchison meteorite. The Sr compositions are radically anomalous in comparison to those in normal solar system materials. As for other heavy elements in presolar SiC, the anomalies can be understood to represent enrichment of s-process (slow neutron capture) nucleosynthetic products, plausibly occurring in asymptotic giant branch stars. The i… Show more

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Cited by 40 publications
(31 citation statements)
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“…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%
See 1 more Smart Citation
“…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%
“…Low-density graphite grains show 18 O enrichment in many of the grains that are taken as proof that they formed in core-collapse supernovae: 18 O is produced via 14 N(α,γ) 18 F(e + ν) 18 O in the partial He burning zone, resulting 18 O/ 16 O ratio of 1.68 in a 15M sun model by Rauscher et al [40]. Many low-density graphite grains show 28 Si excesses, similar to SiC X grains from supernovae, while a few show 29 Si and 30 Si excesses. 28 Si is produced during O burning and excesses in neutron-rich isotopes are indicative of neutron captures in various nucleosynthetic zones.…”
mentioning
confidence: 99%
“…The first approach was used in early measurements of Ba, Nd and Sm in aggregates of presolar SiC by secondary ion mass spectrometry [5] and in recent measurements of SiC-bearing presolar diamond aggregates by inductively coupled plasma (ICP) mass spectrometry [6]. The second approach has been used to measure the isotopic compositions of Sr [7], Ba [8,9], Nd [10], Sm [10] and Dy [11] in SiC aggregates by thermal ionization mass spectrometry. When elements are only partially separated from one another, the properties of elements can be used to reduce interferences.…”
Section: Analytical Techniques For Heavy Elements In Presolar Grainsmentioning
confidence: 99%
“…When elements are only partially separated from one another, the properties of elements can be used to reduce interferences. For example, before measuring Sr isotopes, the filament is heated to a temperature where Rb evaporates and Sr remains on the filament, reducing the isobaric interference between 87 Rb and 87 Sr [7]. The third approach has been applied to measurements of Sr [12], Zr [13], Mo [14], Ru [15] and Ba [16] in individual presolar SiC grains by laser desorption and laser resonant ionization mass spectrometry [17].…”
Section: Analytical Techniques For Heavy Elements In Presolar Grainsmentioning
confidence: 99%
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