利用D-D核反应研究低能区氘与重原子碰撞的屏蔽库仑势  

Study of inter atomic screened coulomb potential between deuterium and heavy atom collision by P/T yield ratio emitted from low energy D-D reaction

作　　者：刘东东[1] 王正海[1] 周钰珊 方开洪[1] 王铁山[1] 

机构地区：[1]兰州大学核科学与技术学院,兰州730000

出　　处：《核技术》2014年第10期94-98,共5页Nuclear Techniques

基　　金：国家自然科学基金(No.11305080;No.11275085)资助

摘　　要：金属材料中D-D核反应出射质子/氚产额的比值(P/T值)与出射粒子探测方向和材料中氘离子运动方向之间的夹角(探测角)相关。实际过程中,氘离子在载体材料中的多次散射将改变探测角,从而影响P/T值。因此,P/T值将反映氘离子-材料原子间的相互作用势。本工作利用10-20 keV能区氘束轰击不同材料形成自吸收靶,并测量了不同靶材料下核反应的P/T值。同时,利用自主开发的蒙特卡罗程序模拟不同能量、不同散射势下D-D核反应的P/T值。结果表明:在普适势模型下,模拟值较实验值偏大;P/T值具有原子序数(Z)相关性。Background： The yield ratio （P/T value） of proton to tritium from D-D nuclear reaction in solid is related to detection angle between direction of emitted particles and that of D ions in solid. Actually, the detection angle is changed by the multiple scattering of D ions with target atom. The P/T value is changed consequently. Purpose： The potential between D ion and target atoms could be derived from this yield ratio PIT in low energy region. Methods： The deuterated targets were obtained by bombarding metal foils with 10-20 keV D^＋beam. Then, P/T values were measured in different targets at different energies. Simultaneously, a Monte Carlo computer program was used to simulate the P/T values with different multiple scattering potentials. Results： The simulated P/T values with the universal potential are systematically larger than the experimental results; P/T value is related to the target atomic number （Z）. Conclusion： P/Tvalue could be a probe to study inter atomic potential in metal targets.

关 键 词：低能区D-D核反应 P/T值 屏蔽势 

分 类 号：TL328[核科学技术—核技术及应用]