Neutron Moderation in the Oklo Natural Reactor and the Time Variation of alpha

Abstract

In the analysis of the Oklo (gabon) natural reactor to test for a possible time variation of the fine structure constant alpha, a Maxwell-Boltzmann low energy neutron spectrum was assumed. We present here an analysis where a more realistic spectrum is employed and show that the most recent isotopic analysis of samples implies a non-zero change in alpha, over the last two billion years since the reactor was operating, of Δα/α\geq 4.5\times 10^{-8} (6σconfidence). Issues regarding the interpretation of the shifts of the low energy neutron resonances are discussed.

7 pages, 4 figures; version 2 included reference to Flambaum/Shuryak work and corrects error in abstract version three corrects a few points and adds discussion on hydrogen and impurity concentrations

References in corpus (2)

• Dependence of hadronic properties on Quark Masses and Constraints on their Cosmological Variation
• Galaxy Clustering and Dark Energy

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