正电子散射Rb、Cs电子偶素形成截面理论计算  

Calculation of positronium formation cross sections in positron-Rb and positron-Cs scattering

作　　者：王远成 李波 王雅冰 WANG Yuancheng;LI Bo;WANG Yabing(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）》2021年第1期85-88,共4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：正电子与原子碰撞问题是原子分子物理的基本问题之一,与天体物理、等离子体物理等多方面都有着密切关系。正负电子偶素形成问题是正电子与原子散射中一种特殊的物理过程,为了研究正电子与铷原子、铯原子碰撞的正负电子偶素形成问题,利用光学势的理论方法分别计算了能量范围2~30 eV的正电子散射铷原子、铯原子基态下(n=1)的正负电子偶素形成截面,并与已有的其他理论结果进行对比分析。研究结果表明,正电子散射铷原子、铯原子基态下正负电子偶素形成截面在低能量区域产生较大的区别,光学势理论方法计算的截面数据与其他理论结果数据符合较好,验证了光学势方法对于处理正电子与碱金属原子碰撞问题的有效性。Positron collisions with atoms is one of the basic subjects in atomic and molecular physics.It provides useful information in plasma physics and astrophysics sciences.Positronium(Ps)formation is a special physical process in positron scattering from atom.In this study,positronium formation cross sections in the positron-rubidium and positron-cesium collisions are calculated by using optical potential method.We calculate the Ps(n=1)formation cross sections for positron-rubidium and positron-cesium collisions in the energy range of 2~30 eV,the results are compared to the available theoretical calculations.The research results show that the Positronium(n=1)formation cross sections have relatively large differences at low energies,and the present results are in good agreement with the other theoretical calculations.It proves effectiveness of the optical potential method for dealing with the collision problem between positron and alkali metal atoms.

关 键 词：正电子 铷原子 铯原子 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]