Other
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978sci...201...51s&link_type=abstract
Science, vol. 201, July 7, 1978, p. 51-56.
Other
60
Abundance, Carbonaceous Chondrites, Meteoritic Composition, Nuclear Fusion, Rare Gases, Chemical Analysis, Fission, Interstellar Matter, Nuclear Reactions, Red Giant Stars, Stellar Evolution, Xenon, Xenon Isotopes, Fusion, Murchison Meteorite, Fission, Dust, Ejecta, Absorption, Gases, Neutrons, Neon, Rare Gases, Meteorites, Carbonaceous Chondrites, Xenon, Isotopes, Krypton, Helium
Scientific paper
The Murchison carbonaceous chondrite contains a new type of xenon component, enriched by up to 50 percent in five of the nine stable xenon isotopes, mass numbers 128 to 132. This component is released at 1200 to 1600 C from a severely etched mineral fraction. Krypton shows a similar but smaller enrichment in the isotopes 80 and 82. Neon and helium released in the same interval also are quite anomalous, being highly enriched in the isotopes 22 and 3. These patterns are strongly suggestive of three nuclear processes believed to take place in red giants: the s process (neutron capture on a slow time scale), helium burning, and hydrogen shell burning. If this interpretation is correct, then primitive meteorites contain yet another kind of alien, presolar material: dust grains ejected from red giants.
Anders Edward
Srinivasan Bhargavi
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