Updated Evaluation of Neutron Nuclear Data for ²³⁶Np

The nuclear data with high accuracy for actinides play an important role in nuclear technology applications, including reactor design and operation, fuel cycle, and estimation of the amount of minor actinides in high burnup reactors and its transmutation. Based on a new set of neutron optical model parameter of ²³⁸Np and the systematic trend of the cross sections of different Np isotopes, a full set of ²³⁶Np neutron nuclear data were updated and improved by theoretical calculation. The present result has significant improvements over the data in CENDL-3.1.