S-process zirconium in individual presolar silicon carbide grains

Details S-process zirconium in individual presolar silicon carbide grains S-process zirconium in individual presolar silicon carbide grains

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1023n&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 023.

Computer Science

2

Zirconium Isotopes, Silicon Carbides, Murchison Meteorite, A Stars, G Stars, B Stars, Krypton Isotopes, Strontium Isotopes, Xenon Isotopes, Barium Isotopes, Neodymium Isotopes

Scientific paper

We have measured the Zr isotopic composition of individual presolar SiC grains from the Murchison meteorite by resonance ionization time-of-flight mass spectrometry. All grains analyzed are strongly depleted in Zr-96, the only isotope of Zr that is not normally produced by the s-process. Grain-size separated aggregates of presolar SiC have shown varying degrees of enrichment in the isotopes of Kr, Sr, Xe, Ba, Nd and Sm produced by s-process nucleosynthesis. Since individual presolar grains may have come from different stars and from different stages of stellar evolution, measurement of heavy element isotopic compositions in presolar grains on a grain-by-grain basis is essential for further understanding of heavy element nucleosynthesis. We have developed a new instrument that combines a high sensitivity, high specificity mass spectrometer with micron-size sampling capability with the goal of isotopic analysis of single presolar grains. We chose to begin with Zr isotopic analysis of SiC grains for several reasons: (1) Zr is the most abundant heavy element in mainstream SiC grains; (2) Zr has four predominantly s-process isotopes and one r-process isotope; (3) because of the relatively long half-life of Zr-95 (64 days), the production of Zr-96 by the s-process is a sensitive indicator of neutron density.

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