Reports

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

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Science  02 Dec 1983:
Vol. 222, Issue 4627, pp. 1013-1015
DOI: 10.1126/science.222.4627.1013

Abstract

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 x 1011 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.