A molecular dynamics-based comparison of defect production in collision cascades during the bombardment of iron with different ions  

作　　者：YANG YaHui TANG XiaoBin CHEN FeiDa HUANG Hai LIU Jian 

机构地区：[1]Department of Nuclear Science and Engineering, Nanjing University of Aeronautics and Astronautics

出　　处：《Science China(Technological Sciences)》2014年第1期29-34,共6页中国科学（技术科学英文版）

基　　金：supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China(SRFDP)(Grant No.20133218110023);the Fundamental Research Funds for the Central Universities;the Fundation of Graduate Innovation Center in NUAA(Grant No.kfjj20130217);the Funding of Jiangsu Innovation Program for Graduate Education and the Fundamental Research Funds for the Central Universities(Grant No.CXZZ13_0159)

摘　　要：We present a computer simulation study on the influence of incident ions on the energy transferred to primary knock-on atoms(PKAs)and defects produced in the cascade collision of irons.Three types of ions(H,Fe,and Xe,which are frequently used in irradiation experiments)with an energy of 3 MeV were simulated.According to the calculation results of SRIM,the average energy transferred to PKAs by Fe ions was the highest among the three types.Then,cascade collisions induced by PKAs with different energies were simulated by the molecular dynamics method.The maximum number of defects produced during irra-diation increased,and the time taken by defect number peak formation was extended with the increased energy of PKAs.The difference in radial distribution function between pre-and post-irradiation irons showed that a higher energy of PKA transferred resulted in a flatter curve.Besides,the law of defects varying in temperature was also investigated.All the researches imply that heavy ions can substitute for neutrons in irradiation experiments which is a practicable way,but the influence of conditions must be taken into account.

关 键 词：molecular dynamics cascade collision defect production Radial Distribution Function （RDF） 

分 类 号：TL31[核科学技术—核技术及应用]