Extinct superheavy element in the Allende meteorite

Details Extinct superheavy element in the Allende meteorite Extinct superheavy element in the Allende meteorite

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975sci...190.1262a&link_type=abstract

Science, vol. 190, Dec. 26, 1975, p. 1262-1271.

Computer Science

35

Meteoritic Composition, Neutron Activation Analysis, Radiochemistry, Transuranium Elements, Chemical Composition, Condensation, Fission Products, Temperature Effects, Trace Elements, Xenon Isotopes

Scientific paper

Radiochemical neutron activation analysis of seven Allende samples for 26 trace elements were conducted. In addition, Cr and Fe were studied with the aid of instrumental neutron activation analysis. The investigation had the objective to identify the extinct superheavy element which was present in meteorites and decayed to Xe isotopes by spontaneous fission. The superheavy element was found to reside mainly in a rare mineral (probably a Fe, Ni, Cr, Al-sulfide), comprising only 0.04% of the meteorite. It is pointed out that of the nine volatile superheavy elements 111 to 119, only 115, 114, and 113 are expected to condense as sulfides in the temperature interval between 400 and 500 K corresponding to mineral formation conditions in the solar nebula.

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