Partial-wave analysis for positronium-xenon collisions in the ultralow-energy region
Partial-wave analysis for positronium-xenon collisions in the ultralow-energy region
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超低能区正电子-氙碰撞的分波分析
DOI：
10.1103/physreva.97.052702
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发表时间：
2018
影响因子：
2.9
通讯作者：
Kengo Shibuya and Haruo Saito
中科院分区：
文献类型：
--
作者：
Kazuyuki Matsuhira;Kazuma Nakamura;Yuki Yasukuni;Yoshihide Yoshimoto;Daigoro Hirai;Zenji Hiroi;Kengo Shibuya and Haruo Saito
我们提出了一种方法来转换成总的和微分截面的正电子素-氙碰撞在低于80毫电子伏的超低能区，他们的实验测定作为函数的正电子素动能是非常困难的，在气态氙测得的正电子素湮没率。这种方法不仅可以确定波的碰撞参数，而且可以确定波和波的参数。我们发现散射长度的一个小正值，这表明在这个能区正电子-氙相互作用是排斥的，并表明它是由正电子的散射振幅而不是电子的散射振幅所控制的.将分析结果外推到实验上不能达到的能区（从80 meV到1.0 eV），表明不应该存在Ramsauer-汤森最小值，而是在总截面中在大约0.4 eV的能量处的峰。
We propose a method to convert measured positronium annihilation rates in gaseous xenon into total and differential cross sections of positronium-xenon collisions in an ultralow-energy region of less than 80 meV where their experimental determinations as functions of the positronium kinetic energy are extremely difficult. This method makes it possible to determine not only the-wave collisional parameters but also the-wave and-wave parameters. We have found a small positive value of the scattering length,, which indicates that the positronium-xenon interaction in this energy region is repulsive and suggests that it is dominated by the scattering amplitude of the positron rather than that of the electron. An extrapolation of the analytical result into the experimentally inaccessible energy regions from 80 meV to 1.0 eV indicates that there should not be a Ramsauer-Townsend minimum but rather a peak in the total cross section at an energy of approximately 0.4 eV.