S-process BA isotopic compositions in presolar SiC from the Murchison meteorite

Details S-process BA isotopic compositions in presolar SiC from the Murchison meteorite S-process BA isotopic compositions in presolar SiC from the Murchison meteorite

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...410..393p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 410, no. 1, p. 393-399.

Astronomy and Astrophysics

Astrophysics

57

Barium Isotopes, Interstellar Matter, Murchison Meteorite, Nuclear Astrophysics, Silicon Carbides, Solar System, Interstellar Chemistry, Mass Spectroscopy, Neutron Cross Sections, Meteorites, Stony Meteorites, Chondrites, Murchison, Isotopes, Ims, Composition, Silicon Carbide, Mass Spectrometry, Samples, Meteorite, Laboratory Studies, Barium, Enrichment, Nucleosynthesis, S Process, Abundance, Procedure, Cm2 Chondrites, Theoretical Studies, Model, Comparison

Scientific paper

We have measured, by thermal ionization mass spectrometry, the isotopic composition of Ba in interstellar SiC-enriched samples (the KJ series) prepared from the Murchison meteorite. Ba in these samples is strongly enriched in components plausibly understood as s-process nucleosynthetic products. Inferred s-process compositions are different from the average s-process contribution to solar system materials in the sense of indicating lower effective neutron exposure. There are variations in s-process compositions which correlate with grain size, indicating lower neutron exposure for the larger grains. The inferred s-process compositions differ significantly from previous theoretical predictions, indicating the need for revision of relevant neutron capture cross sections and providing a target for more detailed modeling of s-process nucleosynthesis in specific stellar environments.

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