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

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

2003-09-18

arxiv.org/abs/nucl-th/0309048v3

Phys.Rev. D69 (2004) 121701

Physics

Nuclear Physics

Nuclear Theory

7 pages, 4 figures; version 2 included reference to Flambaum/Shuryak work and corrects error in abstract version three correct

Scientific paper

10.1103/PhysRevD.69.121701

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 \Delta\alpha/\alpha\geq 4.5\times 10^{-8} (6\sigma confidence). Issues regarding the interpretation of the shifts of the low energy neutron resonances are discussed.

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