物理学报Issue(15)：1-7,7.DOI:10.7498/aps.62.156105
低能中子在锆中产生的辐照损伤的计算机模拟研究*
Computer simulation of radiation damage caused by low energy neutron in zirconium*
摘要
Abstract
Based on the Geant4 program-the package for simulating particle transportation in materials, simulations of the irradiation by neutrons with 1 MeV energy in zirconium were conducted The two adjacent elastic collisions between injected neutron and target atoms produce numerous primary knock-on atoms (PKA). It is found that the average distance of adjacent collisions is 29.47 mm, and the kinetic energy of most PKAs ranges from 1 keV to 15 keV. The damaged area induced by the PKAs is in nanometer scale, which is far less than the distance between the two PKAs. According to the fact that, the subsequent cascade collisions caused by the two PKAs can be considered as a set of independent processes, it is reasonable to study the cascade collisions of the PKAs by means of molecular dynamics method. The cascade collision progress of PKAs with different energies was performed, and the number of interstitial atoms and the size of the damaged regions in the material were extracted. Through the combination of Monte Carlo method and molecular dynamics simulation, a complete physical picture of the primary damage caused by the 1 MeV neutrons in the zirconium was obtained.关键词
辐照损伤/级联碰撞/蒙特卡洛模拟/分子动力学Key words
radiation damage/cascade collision/Monte Carlo simulation/molecular dynamics引用本文复制引用
崔振国,勾成俊,侯氢,毛莉,周晓松..低能中子在锆中产生的辐照损伤的计算机模拟研究*[J].物理学报,2013,(15):1-7,7.基金项目
国家自然科学基金(批准号:91126001,11175124)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant Nos.91126001,11175124) （批准号:91126001,11175124）
