Strontium Isotopic Composition in Individual Circumstellar Silicon Carbide Grains: A Record of {ital s} -Process Nucleosynthesis

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.81.3583· OSTI ID:665569

Nicolussi, G K; Lewis, R S; Davis, A M; Clayton, R N; Amari, S ^[1]; Nicolussi, G K; Pellin, M J ^[2]; Davis, A M; Clayton, R N ^[3]; Clayton, R N ^[4]; Amari, S ^[5]

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1. Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States)
2. Materials Science Chemistry Divisions, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
3. Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois 60637 (United States)
4. Department of Chemistry, University of Chicago, Chicago, Illinois 60637 (United States)
5. McDonnell Center for the Space Sciences, Washington University, St. Louis, Missouri 63130 (United States)

Twenty six individual circumstellar SiC grains extracted from the Murchison meteorite were analyzed for their strontium isotopic compositions by resonant ionization mass spectrometry. Large abundance deficits were found for the p -process isotope {sup 84}Sr . The measured grains hadthinsp {sup 87}Sr/{sup 86}Sr ratios indistinguishable from the primordial solar value, but several grains differed in theirthinsp {sup 88}Sr/{sup 86}Sr ratios as a consequence of the branch point atthinsp {sup 85}Kr . The Sr isotopic data are consistent with s -process nucleosynthesis at moderate neutron densities. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 665569
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 81; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CARBON COMPOUNDS
ISOTOPE RATIO
KRYPTON
KRYPTON ISOTOPES
MASS SPECTROSCOPY
METEORITES
NUCLEOSYNTHESIS
SILICON CARBIDES
SILICON COMPOUNDS
STAR EVOLUTION
STRONTIUM
STRONTIUM ISOTOPES