^176Lu/^175Lu thermometry for Oklo natural reactors: a new look at old data

Details ^176Lu/^175Lu thermometry for Oklo natural reactors: a new look at old data ^176Lu/^175Lu thermometry for Oklo natural reactors: a new look at old data

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprh11007g&link_type=abstract

American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #H11.007

Astronomy and Astrophysics

Astrophysics

Scientific paper

Lutetium thermometry has been used to analyze Oklo natural nuclear reactor zones but leads to widely varying and puzzling predictions for the temperatures TO, which in turn impacts Oklo bounds on the time variation of the fine structure constant α. We revisit results for reactor zone RZ10 in light of new astrophysical measurements of the isomer branching ratio B^g in ^175Lu neutron capture at 5 and 25 keV. We recalculate predictions for TO as a function of B^g using realistic models of the Oklo neutron flux. We find TO= 100 ±30 C using a new value of B^g, in contrast to 350 < TO< 500 C using the evaluated value at thermal energy. Lutetium thermometry can be applicable to analyses of Oklo reactor data, but a better measurement of B^g with thermal neutrons is needed to confirm the reliability of temperature predictions.

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