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Limits on the Variability of Coupling Constants from the Oklo Natural Reactor
J. M. Irvine
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences
Vol. 310, No. 1512, The Constants of Physics (Dec. 20, 1983), pp. 239-243
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/37407
Page Count: 5
You can always find the topics here!Topics: Neutrons, Thermal neutrons, Absorption cross sections, Isotopes, Uranium, Nuclear reactors, Neodymium, Reactor cores, Samarium, Nuclear fuels
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Thermal neutron capture cross sections in fission fragments need to be known to great precision in the nuclear power industry. These cross sections are frequently dominated by extremely narrow neutron capture resonances. An analysis of isotopic abundances at the site of a prehistoric natural reactor at Oklo in West Africa suggests that such a resonance in samarium-149 has moved by less than 0.01 eV in the past 2 × 109 years and this is used to place limits on the variability of coupling constants over this period.
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences © 1983 Royal Society