等离子体环境中正电子与氦原子碰撞电子偶素形成过程理论  

Theoretical study on the positronium formation in positron-helium scattering in plasma environments

作　　者：王远成 佟佳明 李波 WANG Yuancheng;TONG Jiaming;LI Bo(College of Physical Science and Technology,Shenyang Normal University,Shenyang 110034,China)

机构地区：[1]沈阳师范大学物理科学与技术学院,沈阳110034

出　　处：《沈阳师范大学学报（自然科学版）》2023年第1期31-35,共5页Journal of Shenyang Normal University:Natural Science Edition

基　　金：辽宁省科技厅自然科学基金资助项目(20180550772)。

摘　　要：正负电子偶素(Positronium,Ps)的形成是正电子-原子碰撞过程中独有的物理过程。为了探究正电子与氦原子散射过程中正负电子偶素形成的问题,应用屏蔽近似模型下的光学势理论方法研究了等离子体环境中正电子-氦原子碰撞的电子偶素形成过程,计算了0~100 eV入射能量区域内总的正负电子偶素形成截面(1s+2s)。在计算等离子体环境中靶原子体系的能级及波函数时,应用屏蔽的氦原子模型势描述了屏蔽效应对粒子间相互作用的影响。电子偶素形成截面计算结果与已有的其他理论、实验结果对比并进行了分析。验证了在中低入射能量下,屏蔽模型下的光学势理论方法对于处理正电子-氦原子散射问题具有有效性。Positronium(Ps)formation in positron-helium collisions is a unique physical process.In this paper,in order to explore the question of the Ps formation,positronium formation in positron-helium collisions in plasma environments has been investigated using the optical potential method based on the screening approximation model.Total positronium formation cross sections(1s+2s)in the energy range 0~100 eV have been calculated.The model potential was used to calculate the ground state election binding energies of helium atoms in plasma environments and describe the screening effect of the interaction between particles.Calculation results of positronium formation cross sections are compared with other theoretical and experimental results in this study.The research results show that the optical potential method based on the screening model is effective in dealing with positron-helium scattering problems at low and intermediate incident energies.

关 键 词：正电子 氦原子 光学势 电子偶素形成截面 

分 类 号：O562.5[理学—原子与分子物理]