The Oklo natural reactors - Cumulative fission yields and nuclear characteristics of Reactor Zone 9

Details The Oklo natural reactors - Cumulative fission yields and nuclear characteristics of Reactor Zone 9 The Oklo natural reactors - Cumulative fission yields and nuclear characteristics of Reactor Zone 9

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..89..193l&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 89, no. 2, July 1988, p. 193-206. Research supported by Battelle Colu

Computer Science

3

Mines (Excavations), Nuclear Fission, Radioactive Wastes, Uranium Isotopes, Abundance, Alpha Particles, Gabon, Mass Spectroscopy

Scientific paper

The isotopic composition of Mo, Ru, Pd, Ag, Cd, Sn, Te, Nd, and U have been measured by solid source mass spectrometry in eight uraninite samples from Reactor Zone 9 at the Oklo natural reactors. Cumulative fission yields for most of these elements have been derived after correcting for the primordial component of the element concerned. Neutron capture reactions on a number of nuclides with significant thermal cross sections, and fission chains in which one of the precursor nuclides has a lengthy half-life, are examined to provide information on the relative mobilities of the elements involved. The proportions of U-235, U-238, and Pu-239 are found to be 88, 8, and 4 percent, respectively. It is shown that almost half of the fissioning U-235 nuclides were produced from the alpha-decay of Pu-239. The integrated neutron flux in the zone was calculated to be about 3.6 X 10 to the 20th n/cu cm.

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