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

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

2010-10-12

arxiv.org/abs/1010.2385v3

Physics Letters A, Volume 375, Issue 44, 2011, Pages 3872-3876

Physics

Atomic Physics

15 pages, 6 figures

Scientific paper

10.1016/j.physleta.2011.09.012

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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