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The analysis of keff multiplicative factor of 100%-MOx cores and plutonium solutions showed a systematic discrepancy between calculation and experiment. The aim of this paper is to propose an improved version of the JEFF-3.1 239 Pu evaluation in the low-energy neutron range. We propose here slight modifications of the evaluation file, consistent with the uncertainties of differential data measurements in sub-thermal/thermal and epithermal ranges, namely: modifications of the sub-thermal fission, capture and total cross-sections, and a revised evaluation of νp from sub-thermal up to 20eV using a phenomenological formalism. The proposed modifications are described and tested against integral measurements.

239Pu nuclear data improvements in thermal and epithermal neutron ranges

²³⁹Pu nuclear data improvements in thermal and epithermal neutron ranges