Speaker
Description
Nuclear response cross-sections, including KERMA (Kinetic Energy Release in Materials) factor, displacement damage cross-section and gas production cross-section, are critical nuclear data for nuclear heating, atomic displacement and H/He gas production. KERMA factor and displacement damage cross-section are researched at Harbin Engineering University recently for some potential problems.
Concerning neutron KERMA factors, values calculated using nuclear data processing codes often show erroneous results and lack physical consistency. This is because the energy balance in evaluated nuclear data libraries cannot be ensured, or the processing methods employed in the codes are inappropriate. To provide key information for the improvement and correction of evaluated nuclear data libraries, neutron KERMA factors for major reaction types—including scattering, fission, absorption, and radiative capture reactions—are calculated and analyzed based on the FENDL-3.2 and JENDL-5 libraries. All unphysical negative values in these reactions are identified, classified, and collated. The causes of the erroneous results are analyzed, and suggestions are proposed for revising the data in the evaluated nuclear data libraries.
For displacement damage cross-section, displacement function model is the key to its accuracy calculation. Traditional displacement function model cannot describes the whole and real physical processes, leading to precision loss. To obtain displacement damage cross-section correctly, an improved Athermal Recombination Corrected (i-ARC) 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.
In conclusion, some researches on KERMA factors and displacement damage cross-sections are performed in the recent years at Harbin Engineering University to provide more accuracy nuclear response cross-sections. Nevertheless, much work remains to be done in the near future. For example, the specific causes leading to erroneous KERMA factors need to be identified, and more physically consistent KERMA factors should be provided. In addition, the differential cross sections for different incident particles still need to be re-evaluated to obtain more accurate displacement damage cross sections.
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