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. 2006 Feb 17;96(6):063401.
doi: 10.1103/PhysRevLett.96.063401. Epub 2006 Feb 13.

Measurement of the decay rate of the negative ion of positronium (Ps-)

Frank Fleischer  1 , Kai Degreif, Gerald Gwinner, Michael Lestinsky, Vitaly Liechtenstein, Florian Plenge, Dirk Schwalm
Affiliations

Measurement of the decay rate of the negative ion of positronium (Ps-)

Frank Fleischer et al. Phys Rev Lett. .

Abstract

A new determination of the decay rate of the negative ion of positronium (Ps-), using a beam-foil method and a stripping-based detection technique, is reported. The measured result of gamma = 2.089(15) ns(-1) is a factor of 6 more precise than the previous experimental value of gamma = 2.09(9) ns(-1), and is in excellent agreement with the theoretical value of gamma = 2.086(6) ns(-1).

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