Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224.1000c&link_type=abstract
Astrophysical Journal, Part 1, vol. 224, Sept. 15, 1978, p. 1000-1006.
Astronomy and Astrophysics
Astrophysics
22
Abundance, Interstellar Chemistry, Krypton Isotopes, Meteoritic Composition, Nuclear Fusion, Xenon Isotopes, Carbonaceous Chondrites, Cosmic Dust, Iodine Isotopes, Planetary Evolution, Solar System
Scientific paper
We propose an analysis of the s-process contributions to the isotopes of xenon and krypton. The object is to aid studies of the possibility that meteorites may contain gas that was carried in presolar grains that were grown in stellar ejecta and that were not degassed prior to incorporation into parent bodies. That model suggests routine interstellar fractionation of s-isotopes from r-isotopes owing to differential incorporation into dust. We show that a deficiency of s-process nuclei cannot yield details of Xe-X, but the gross similarities are strong enough to lead one to think that such a deficiency may play a role in a more complicated explanation. We predict the existence of an s-rich complement somewhere if fractional separation of this type has played a role in Xe-X. We show that the analogous decomposition of krypton is more uncertain, and we call for measurements of neutron-capture cross sections to alleviate these uncertainties.
Clayton Donald D.
Ward Richard A.
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