Polaron theory of positron annihilation in xenon.
Polaron theory of positron annihilation in xenon.
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氙中正电子湮灭的极化子理论。
DOI：
10.1103/physreve.48.3667
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Miller
中科院分区：
文献类型：
--
作者：
Chen;Miller
正电子在流体氙气中湮没速率的实验测量表明，它与流体密度呈反常的非线性关系。最近对该系统的路径积分蒙特卡罗模拟表明，这种非线性是由于在中等密度下围绕正电子形成的氙团造成的。在本文中，我们研究了解析参考-相互作用-位置-模型-(RISM)极化子理论复制这些结果的能力，并在更广泛的情况下提供了关于e+-Xe系统的更丰富的信息。考虑了棱镜方程的两个截然不同的闭合，以及改变势的吸引部分的影响。
Experimental measurements of the annihilation rate of a positron in fluid xenon show that it exhibits an anomalously nonlinear dependence on the fluid density. Recent path-integral Monte Carlo simulations of the system suggest that the nonlinearity results from the formation of xenon clusters which surround the positron at moderate densities. In this paper we investigate the ability of the analytic reference-interaction-site-model-(RISM) polaron theory to replicate these results, and provide richer information concerning the e + -xenon system over a wider range of circumstances. Two distinct closures of the RISM equation are considered, as well as the effects of altering the attractive part of the potential