Self-consistent solution of the Kahana equation for a positron in an electron gas.
Self-consistent solution of the Kahana equation for a positron in an electron gas.
复制标题
电子气中正电子的 Kahana 方程的自洽解。
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
Stachowiak
中科院分区：
文献类型：
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作者：
Rubaszek;Stachowiak
一个自洽的发展Kahana形式主义。与传统方法相比，该方法的优点在于考虑了电子-电子关联的影响，并使Bethe-Goldstone方程中的势与正电子周围的屏蔽电荷分布完全自洽。以这种方式，消除了湮灭率ensuremath{lambda}的众所周知的低密度发散。在低电子密度下，后者接近平均的自由正电子偶素值。在这项工作中获得的湮没参数与实验结果是合理的协议。
A self-consistent development of the Kahana formalism is presented. The merits of this approach in comparison with the traditional one consist of including the effect of electron-electron correlations and achieving full self-consistency between the potential used in the Bethe-Goldstone equation and the screening charge distribution around the positron, obtained from its solutions. In this way the well-known low-density divergence of the annihilation rate ensuremath{lambda} is removed. At low electron densities the latter approaches the averaged free-positronium value. The annihilation parameters obtained in this work are in reasonable agreement with experimental results.