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Towards a new measurement of the decay rate of the negative Positronium Ion Ps-

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Schwalm,  D.
Prof. Dirk Schwalm, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Fleischer,  F.
Prof. Dirk Schwalm, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Lestinsky,  M.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Degreif,  K.
Prof. Dirk Schwalm, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Gwinner,  G.
Prof. Dirk Schwalm, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Plenge,  Florian
Prof. Dirk Schwalm, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Scheit,  H.
Prof. Dirk Schwalm, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Citation

Schwalm, D., Fleischer, F., Lestinsky, M., Degreif, K., Gwinner, G., Liechtenstein, V., et al. (2004). Towards a new measurement of the decay rate of the negative Positronium Ion Ps-. Proceedings of the XII International Workshop on Positron and Positronium Physics, 185-194.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-8BC4-A
Abstract
Despite numerous theoretical papers on the properties of the negative positronium ion Ps-, which reflect the great interest in this fundamental system consisting of three leptons e+e-e-, so far only two measurements have been performed twenty years ago. They established the existence of Ps- and measured its lifetime to an accuracy of 4%. We have built a set-up to produce Ps- making use of moderated positrons from a 22Na source, and we are presently preparing experiments to improve on its decay rate. The status of the experiment is discussed together with the possibilities to extend these investigations to other fundamental properties of Ps- which are becoming accessible using the new positron source at the FRM II reactor in Munich.