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Berlin 2001 – scientific programme

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A: Atomphysik

A 10: Posters Wednesday (Cooling and Trapping, Electron Scattering and Recombination)

A 10.28: Poster

Wednesday, April 4, 2001, 12:30–15:00, AT3

Towards a new Measurement of the Decay Rate of the Positronium Negative Ion — •K. Degreif1, F. Fleischer1, G. Gwinner1, R. Ley2, F. Plenge1, and D. Schwalm11MPI für Kernphysik, 69029 Heidelberg — 2Institut für Physik, 55099 Mainz

Consisting of two electrons and a positron, the positronium negative ion (Ps) represents the simplest three-body-system with a bound state. Being free from perturbations due to strong interactions the system provides interesting opportunities to test our understanding of the three-body problem and quantum electrodynamics. Previous experiments have so far only proved the existence of Ps [1] and determined the decay rate with 4% accuracy [2]. To allow for a test of radiative corrections and bound-state contributions to the decay rate an increase in precision of at least one order of magnitude is necessary. Of particular interest is also the measurement of the 3γ/2γ-branching ratio because of its relevance to the ortho-Ps lifetime and the photoionization cross section of Ps. An experiment has been built up at the MPI für Kernphysik to investigate the decay rate and other properties of Ps in more detail. The set-up and first measurements concerning the production rate of Ps will be discussed.

[1] A.P. Mills, Jr., Phys. Rev. Lett. 46, 717(1981)

[2] A.P. Mills, Jr., Phys. Rev. Lett. 50, 671(1983)

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