Barium Isotopes in Allende Meteorite: Evidence against an Extinct Superheavy Element

Carbon and chromite fractions from the Allende meteorite that contain isotopically anomalous xenon-131 to xenon-136 (carbonaceous chondrite fission or CCF xenon) at up to 5 $\times $ 10$^{11}$ atoms per gram show no detectable isotopic anomalies in barium-130 to barium-138. This rules out the possib...

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Veröffentlicht in:	Science (American Association for the Advancement of Science) 1983-12, Vol.222 (4627), p.1013-1015
Hauptverfasser:	Lewis, R. S., Anders, E., Shimamura, T., Lugmair, G. W.
Format:	Artikel
Sprache:	eng
Schlagworte:	640107 - Astrophysics & Cosmology- Planetary Phenomena ABUNDANCE ALKALINE EARTH ISOTOPES Allende meteorite Astronomical extinction astrophysics Atoms Barium BARIUM 130 BARIUM 135 BARIUM 138 BARIUM ISOTOPES Carbon CHONDRITES CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS DAYS LIVING RADIOISOTOPES EVEN-EVEN NUCLEI EVEN-ODD NUCLEI FISSION Geophysical research INTERMEDIATE MASS NUCLEI INTERNAL CONVERSION RADIOISOTOPES ISOMERIC TRANSITION ISOTOPES ISOTOPE RATIO ISOTOPES Lunar And Planetary Exploration METEORITES Neutron capture NUCLEAR REACTIONS NUCLEI NUCLEOSYNTHESIS R PROCESS RADIOISOTOPES STABLE ISOTOPES STAR EVOLUTION Stellar nucleosynthesis STONE METEORITES SYNTHESIS Xenon XENON 131 XENON 134 XENON 136 XENON ISOTOPES
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Zusammenfassung:	Carbon and chromite fractions from the Allende meteorite that contain isotopically anomalous xenon-131 to xenon-136 (carbonaceous chondrite fission or CCF xenon) at up to 5 $\times $ 10$^{11}$ atoms per gram show no detectable isotopic anomalies in barium-130 to barium-138. This rules out the possibility that the CCF xenon was formed by in situ fission of an extinct superheavy element. Apparently the CCF xenon and its carbonaceous carrier are relics from stellar nucleosynthesis.
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.222.4627.1013