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

Journal Article · Thu Oct 01 00:00:00 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, Vol. 81, Issue 17; Other Information: PBD: Oct 1998
• Country of Publication: United States
• Language: English

Related Subjects

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