CORRELATED STRONTIUM AND BARIUM ISOTOPIC COMPOSITIONS OF ACID-CLEANED SINGLE MAINSTREAM SILICON CARBIDES FROM MURCHISON

Liu, Nan; Davis, Andrew M.; Dauphas, Nicolas; Pellin, Michael J.; Savina, Michael R.; Gallino, Roberto; Bisterzo, Sara; Gyngard, Frank; Käppeler, Franz; Cristallo, Sergio; Dillmann, Iris

doi:10.1088/0004-637X/803/1/12

CORRELATED STRONTIUM AND BARIUM ISOTOPIC COMPOSITIONS OF ACID-CLEANED SINGLE MAINSTREAM SILICON CARBIDES FROM MURCHISON

Journal Article · Fri Apr 10 00:00:00 EDT 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/803/1/12· OSTI ID:22521993

Liu, Nan; Davis, Andrew M.; Dauphas, Nicolas; Pellin, Michael J. ^[1]; Savina, Michael R. ^[2]; Gallino, Roberto; Bisterzo, Sara ^[3]; Gyngard, Frank ^[4]; Käppeler, Franz ^[5]; Cristallo, Sergio ^[6]; Dillmann, Iris ^[7]

Department of the Geophysical Sciences, The University of Chicago, Chicago, IL, 60637 (United States)
Chicago Center for Cosmochemistry, Chicago, IL 60637 (United States)
Dipartimento di Fisica, Università di Torino, I-10125 Torino (Italy)
Laboratory for Space Sciences, Washington University, St. Louis, MO 63130 (United States)
Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe D-76021 (Germany)
INAF, Osservatorio Astronomico di Collurania, I-64100 Teramo (Italy)
TRIUMF, 4004 Wesbrook Mall, Vancouver BC V6T 2A3 (Canada)

We present strontium, barium, carbon, and silicon isotopic compositions of 61 acid-cleaned presolar SiC grains from Murchison. Comparison with previous data shows that acid washing is highly effective in removing both strontium and barium contamination. For the first time, by using correlated {sup 88}Sr/{sup 86}Sr and {sup 138}Ba/{sup 136}Ba ratios in mainstream SiC grains, we are able to resolve the effect of {sup 13}C concentration from that of {sup 13}C-pocket mass on s-process nucleosynthesis, which points toward the existence of large {sup 13}C pockets with low {sup 13}C concentrations in asymptotic giant branch stars. The presence of such large {sup 13}C pockets with a variety of relatively low {sup 13}C concentrations seems to require multiple mixing processes in parent asymptotic giant branch stars of mainstream SiC grains.

OSTI ID:: 22521993

Journal Information:: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 803; ISSN ASJOAB; ISSN 0004-637X

Country of Publication:: United States

Language:: English

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79 ASTRONOMY AND ASTROPHYSICS
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INTERSTELLAR GRAINS
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CORRELATED STRONTIUM AND BARIUM ISOTOPIC COMPOSITIONS OF ACID-CLEANED SINGLE MAINSTREAM SILICON CARBIDES FROM MURCHISON

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