Updated Neutron Nuclear Data Evaluation for ²³⁸Np

The nuclear data with high accuracy for minor actinides play an important role in nuclear technology applications, including reactor design and operation, fuel cycle, estimation of the amount of minor actinides in high burnup reactors and the minor actinides transmutation. Based on a new set of neutron optical model parameter and the systematic change law of Np isotopes reaction cross section, a full set of ²³⁸Np neutron nuclear data was updated and improved through theoretical calculation, and the present result is better than the data in CENDL-3.1.