The role of positronium decoherence in positron annihilation in matter |
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Authors: | M Pietrow P S?omski |
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Institution: | a Institute of Physics, M. Curie-Sk?odowska University, ul. Pl. M. Curie-Sk?odowskiej 1, 20-031 Lublin, Poland b Geographic Information Systems Development Company Martinex, ul. Me?giewska 95, 21-040 ?widnik, Poland |
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Abstract: | A small difference between the energies of the para-positronium (p-Ps) and ortho-positronium (o-Ps) states suggests the possibility of the 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. It is shown that such a superposition decoheres in the basis of p-Ps and o-Ps. The decoherence time scale estimated here motivates a correction in the precise analysis of the positron annihilation lifetime spectra. More generally, the superposited Ps state should contribute to the theory of the evolution of positronium in matter. |
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Keywords: | Positronium Decoherence Positron annihilation lifetime spectroscopy (PALS) |
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