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Title: Barium isotopes in individual presolar silicon carbide grains from the Murchison meteorite.

Abstract

Barium isotopic compositions of single 2.3-5.3 {mu}m presolar SiC grains from the Murchison meteorite were measured by resonant ionization mass spectrometry. Mainstream SiC grains are enriched in s-process barium and show a spread in isotopic composition from solar to dominantly s-process. In the relatively coarse grain size fraction analyzed, there are large grain-to-grain variations of barium isotopic composition. Comparison of single grain data with models of nucleosynthesis in asymptotic giant branch (AGB) stars indicates that the grains most likely come from low mass carbon-rich AGB stars (1.5 to 3 solar masses) of about solar metallicity and with approximately solar initial proportions of r- and s-process isotopes. Measurements of single grains imply a wide variety of neutron-to-seed ratios, in agreement with previous measurements of strontium, zirconium and molybdenum isotopic compositions of single presolar SiC grains.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA); FOR
OSTI Identifier:
949642
Report Number(s):
ANL/MSD/JA-42786
Journal ID: ISSN 0016-7037; GCACAK; TRN: US201012%%425
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Geochim. Cosmochim. Acta
Additional Journal Information:
Journal Volume: 67; Journal Issue: 17 ; Sep. 2003; Journal ID: ISSN 0016-7037
Country of Publication:
United States
Language:
ENGLISH
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BARIUM; BARIUM ISOTOPES; GRAIN SIZE; IONIZATION; MASS SPECTROSCOPY; METEORITES; MOLYBDENUM; NUCLEOSYNTHESIS; S PROCESS; SILICON CARBIDES; STARS; STRONTIUM; ZIRCONIUM

Citation Formats

Savina, M R, Davis, A M, Tripa, C E, Pellin, M J, Clayton, R N, Lewis, R S, Amari, S, Gallino, R, Lugaro, M, Univ. of Chicago, Washington Univ., Univ. di Torino, and Cambridge Univ. Barium isotopes in individual presolar silicon carbide grains from the Murchison meteorite.. United States: N. p., 2003. Web. doi:10.1016/S0016-7037(03)00083-8.
Savina, M R, Davis, A M, Tripa, C E, Pellin, M J, Clayton, R N, Lewis, R S, Amari, S, Gallino, R, Lugaro, M, Univ. of Chicago, Washington Univ., Univ. di Torino, & Cambridge Univ. Barium isotopes in individual presolar silicon carbide grains from the Murchison meteorite.. United States. https://doi.org/10.1016/S0016-7037(03)00083-8
Savina, M R, Davis, A M, Tripa, C E, Pellin, M J, Clayton, R N, Lewis, R S, Amari, S, Gallino, R, Lugaro, M, Univ. of Chicago, Washington Univ., Univ. di Torino, and Cambridge Univ. 2003. "Barium isotopes in individual presolar silicon carbide grains from the Murchison meteorite.". United States. https://doi.org/10.1016/S0016-7037(03)00083-8.
@article{osti_949642,
title = {Barium isotopes in individual presolar silicon carbide grains from the Murchison meteorite.},
author = {Savina, M R and Davis, A M and Tripa, C E and Pellin, M J and Clayton, R N and Lewis, R S and Amari, S and Gallino, R and Lugaro, M and Univ. of Chicago and Washington Univ. and Univ. di Torino and Cambridge Univ.},
abstractNote = {Barium isotopic compositions of single 2.3-5.3 {mu}m presolar SiC grains from the Murchison meteorite were measured by resonant ionization mass spectrometry. Mainstream SiC grains are enriched in s-process barium and show a spread in isotopic composition from solar to dominantly s-process. In the relatively coarse grain size fraction analyzed, there are large grain-to-grain variations of barium isotopic composition. Comparison of single grain data with models of nucleosynthesis in asymptotic giant branch (AGB) stars indicates that the grains most likely come from low mass carbon-rich AGB stars (1.5 to 3 solar masses) of about solar metallicity and with approximately solar initial proportions of r- and s-process isotopes. Measurements of single grains imply a wide variety of neutron-to-seed ratios, in agreement with previous measurements of strontium, zirconium and molybdenum isotopic compositions of single presolar SiC grains.},
doi = {10.1016/S0016-7037(03)00083-8},
url = {https://www.osti.gov/biblio/949642}, journal = {Geochim. Cosmochim. Acta},
issn = {0016-7037},
number = 17 ; Sep. 2003,
volume = 67,
place = {United States},
year = {Mon Sep 01 00:00:00 EDT 2003},
month = {Mon Sep 01 00:00:00 EDT 2003}
}