The paper derives a spectrum for para-positronium whose imaginary part gives a decay time of 13.2 femtoseconds, four orders of magnitude shorter than the measured 125 picosecond vacuum lifetime.
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Exact annihilation energy and proper decay time solution of a para-positronium system
The paper derives a spectrum for para-positronium whose imaginary part gives a decay time of 13.2 femtoseconds, four orders of magnitude shorter than the measured 125 picosecond vacuum lifetime.