Improved Athermal Recombination Corrected DPA Model for Displacement Damage Cross Section Calculation

Abstract Accurate evaluation of material irradiation damage is the basis for safe and economical operation of nuclear facilities. Displacement damage is an important component of material irradiation damage, and the level of displacement damage in materials is usually described by the displacement damage rate. The estimation of displacement damage rate requires the prior knowledge of displacement damage cross section and displacement function model is the key to the displacement damage cross section calculation. Traditional displacement damage function models have significant errors in the calculation of the displacement damage function near the average atomic displacement threshold energy because they use step function approximately for the calculation of the number of displaced atoms. In order to improve the accuracy of displacement damage cross section calculation, an improved ARC-DPA (iARC-DPA) model is proposed, which uses the power function model near the average atomic displacement threshold energy and original ARC-DPA model in the other energy part. The iARC-DPA model has been used in the calculation of displacement damage cross sections for different incident particles, including electron, neutron and charged particles. The displacement damage cross sections of different particles are calculated and compared with the experimental data. Numerical results show that the iARC-DPA model largely improves the accuracy of displacement damage cross section calculation.