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Lutetium thermometry has been used to analyze Oklo natural nuclear reactorzones but leads to widely varying and puzzling predictions for the temperatures$T_O$ which in turn impacts bounds on time variation of the fine structureconstant $\alpha$. We revisit results for reactor zone RZ10 in light of newmeasurements of the isomer branching ratio $B^g$ in $^{175}$Lu neutron captureat 5 and 25 keV. We recalculate predictions for $T_O$ as a function of $B^g$using realistic models of the Oklo neutron flux. We find $T_O = 100 \pm 30$ Cusing a new value of $B^g$, in contrast to $350 < T_O < 500 $ C using theevaluated value at thermal energy. Lutetium thermometry can be applicable toanalyses of Oklo reactor data, but a better measurement of $B^g$ with thermalneutrons is needed to confirm the reliability of temperature predictions.

Lutetium thermometry for Oklo natural reactors: a new look at old data