Other
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340..613c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 340, May 1, 1989, p. 613-619. Research supported by the Robert A. Welch Fou
Other
64
Meteoritic Composition, Meteoritic Diamonds, Supernovae, Xenon, Abundance, Carbonaceous Chondrites, Neutrinos, Neutrons, Nuclear Fusion, Stellar Envelopes, Meteorites, Diamonds, Composition, Origin, Formation, Xenon 136, Helium, Isotopes, Carbonaceous Chondrites, Nucleosynthesis, Abundance, Krypton, Anomalies, Mixing, Rare Gases, Neon, Condensation
Scientific paper
The neutrino burst from the collapsed core in Type II supernovae liberates free neutrons by nu, nu-prime(n) reactions which drive isotopic abundances several mass steps heavier. The neutron fluence in the He shell, abetted by another burst 10 s later from alpha, n reactions, is about right for rendering Xe-136, the most abundant Xe isotope. The Xe isotopic composition is a good match to Xe-H, the unshielded neutron-rich Xe component abundant in carbonaceous meteorites. The He shell is implicated because it is the only C-rich shell in massive stars that can be expected to condense solid carbon thermally, a requirement for locating the Xe-H in meteoritic diamonds, which are so common as to require an abundant Galactic source of unoxidized carbon.
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