Beyond the Point Ps Approximation

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Stepanov, Sergey V.; Zvezhinskiy, Dmitry S.; Byakov, Vsevolod M.;
(2012)

In application to positron annihilation spectroscopy, Ps atom is considered not as a point particle, but as a finite size e+ e- pair localized in a bubble-state in a medium. Variation of the internal Coulombic e+ -e- attraction vs. the bubble radius is estimated.
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