arXiv 1010.23852010-10physics.atom-phquant-ph

正电子偶素退相干在正电子湮没研究中的作用

The role of positronium decoherence in the studies of positron annihilation in matter

Marek Pietrow, Piotr Slomski

备注：: 15 pages, 6 figures
发表信息：: Physics Letters A, Volume 375, Issue 44, 2011, Pages 3872-3876
DOI：: 10.1016/j.physleta.2011.09.012

摘要：

对位电子偶素（p-Ps）和邻位电子偶素（o-Ps）态能量之间的微小差异表明，在形成电子偶素（Ps）的过程中，p-Ps和o-Ps的叠加可能性来自于pre-Ps终止其在空隙（“自由体积”）中的物质中的迁移。结果表明，这种叠加退相干是基于p-Ps和o-Ps的，并对退相干时间进行了估计。在这里估计的退相干的时间尺度激励相应的正电子湮没寿命谱的分解中的校正。简述了校正的方法。退相干的时间尺度表明，当处理正电子湮没技术的实验数据时，需要意识到这一点。更一般地说，Ps的叠加态应该有助于正电子偶素在物质中的演化理论。

英文摘要：

A small difference between the energy of the para-positronium (p-Ps) and ortho-positronium (o-Ps) states suggests the possibility of superposition of p-Ps and o-Ps during the formation of positronium (Ps) from pre-Ps terminating its migration in the matter in a void ('free volume'). It is shown that such a superposition decohere in the basis of p-Ps and o-Ps and the decoherence time is estimated. The time scale of the decoherence estimated here motivates respective correction in decomposition of the positron annihilation lifetime spectra. The way of the correction is sketched. The timescale of the decoherence suggests a need of awareness when experimental data from positron annihilation techniques are processed. More generally, the superposited state of Ps should contribute to the evolution theory of positronium in matter.

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