Strontium Isotopic Composition in Individual Circumstellar Silicon Carbide Grains: A Record of-Process Nucleosynthesis
- 26 October 1998
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 81 (17) , 3583-3586
- https://doi.org/10.1103/physrevlett.81.3583
Abstract
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 -process isotope . The measured grains had ratios indistinguishable from the primordial solar value, but several grains differed in their ratios as a consequence of the branch point at . The Sr isotopic data are consistent with -process nucleosynthesis at moderate neutron densities.
Keywords
This publication has 17 references indexed in Scilit:
- STELLAR NUCLEOSYNTHESIS AND THE ISOTOPIC COMPOSITION OF PRESOLAR GRAINS FROM PRIMITIVE METEORITESAnnual Review of Earth and Planetary Sciences, 1998
- Evolution and Nucleosynthesis in Low‐Mass Asymptotic Giant Branch Stars. II. Neutron Capture and thes‐ProcessThe Astrophysical Journal, 1998
- s-Process Zirconium in Presolar Silicon Carbide GrainsScience, 1997
- Isotopic Analysis of Ca from Extraterrestrial Micrometer-Sized SiC by Laser Desorption and Resonant Ionization Mass SpectroscopyAnalytical Chemistry, 1997
- Trace‐element concentrations in single circumstellar silicon carbide grains from the Murchison meteoriteMeteoritics, 1995
- The origin of circumstellar silicon carbide grains found in meteoritesMeteoritics, 1995
- The Chemical Composition of Red Giants. IV. The Neutron Density at the s-Process SiteThe Astrophysical Journal, 1995
- New instrument for microbeam analysis incorporating submicron imaging and resonance ionization mass spectrometryReview of Scientific Instruments, 1995
- Carbon, nitrogen, magnesium, silicon, and titanium isotopic compositions of single interstellar silicon carbide grains from the Murchison carbonaceous chondriteThe Astrophysical Journal, 1994
- Interstellar grains in meteorites: I. Isolation of SiC, graphite and diamond; size distributions of SiC and graphiteGeochimica et Cosmochimica Acta, 1994