电子交换模型势在正电子素-氦散射中的应用
Electron exchange model potential: Application to positronium-helium scattering
摘要：
本文提出了一个适用于电子交换的非定域模型势，并用电子-氢和电子-氦散射进行了检验，并应用于氦原子对正电子偶素（Ps）的弹性和非弹性散射及电离的研究。在三态密耦近似下研究了Ps的弹性散射和$n = 2$激发。在有交换的玻恩近似下，研究了Ps原子的高激发态（$n\ge 3$）和电离态.计算报告的相移，弹性，PS-激发，和总截面。本目标的弹性总截面符合良好的实验结果，在热介质能量。
英文摘要：
The formulation of a suitable nonlocal model potential for electron exchange is presented, checked with electron-hydrogen and electron-helium scattering, and applied to the study of elastic and inelastic scattering and ionization of ortho positronium (Ps) by helium. The elastic scattering and the $n = 2$ excitations of Ps are investigated using a three-Ps-state close-coupling approximation. The higher ($n\ge 3$) excitations and ionization of Ps atom are treated in the framework of Born approximation with present exchange. Calculations are reported of phase shifts, and elastic, Ps-excitation, and total cross sections. The present target elastic total cross section agrees well with experimental results at thermal to medium energies.
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