title: Measurement of the decay rate of the negative ion of positronium (Ps-).
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).
authors.affiliation: Max-Planck-Institut für Kernphysik, Heidelberg, Germany. F.Fleischer@mpi-hd.mpg.de
authors.forename: Frank
authors.initials: F
authors.lastname: Fleischer
authors.forename: Kai
authors.initials: K
authors.lastname: Degreif
authors.forename: Gerald
authors.initials: G
authors.lastname: Gwinner
authors.forename: Michael
authors.initials: M
authors.lastname: Lestinsky
authors.forename: Vitaly
authors.initials: V
authors.lastname: Liechtenstein
authors.forename: Florian
authors.initials: F
authors.lastname: Plenge
authors.forename: Dirk
authors.initials: D
authors.lastname: Schwalm