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Observation of positronium annihilation in the 2S state: towards a new measurement of the 1S-2S transition frequency

Cooke, D. ; Crivelli, P. ; Alnis, J. ; Antognini, A. ; Brown, B. ; Friedreich, S. ; Gabard, A. ; Haensch, T. ; Kirch, K. ; Rubbia, A. ; Vrankovic, V.

In: Hyperfine Interactions, 2015, vol. 233, no. 1-3, p. 67-73

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    Titel
    • Observation of positronium annihilation in the 2S state: towards a new measurement of the 1S-2S transition frequency
    Autor
    • Cooke, D.. ETH Zurich, Institute for Particle Physics, 8093, Zürich, Switzerland
    • Crivelli, P.. ETH Zurich, Institute for Particle Physics, 8093, Zürich, Switzerland
    • Alnis, J.. Max-Planck-Institute of Quantum Optics, 85741, Garching, Germany
    • Antognini, A.. ETH Zurich, Institute for Particle Physics, 8093, Zürich, Switzerland
    • Brown, B.. Marquette University, 53233, Milwaukee, WI, USA
    • Friedreich, S.. ETH Zurich, Institute for Particle Physics, 8093, Zürich, Switzerland
    • Gabard, A.. Paul Scherrer Institute, 5232, Villigen, Switzerland
    • Haensch, T.. Max-Planck-Institute of Quantum Optics, 85741, Garching, Germany
    • Kirch, K.. ETH Zurich, Institute for Particle Physics, 8093, Zürich, Switzerland
    • Rubbia, A.. ETH Zurich, Institute for Particle Physics, 8093, Zürich, Switzerland
    • Vrankovic, V.. Paul Scherrer Institute, 5232, Villigen, Switzerland
    Dokumententyp
    • Postprint
    Sprache
    • Englisch
    Veröffentlicht in
    • Hyperfine Interactions, 2015, vol. 233, no. 1-3, p. 67-73. Springer International Publishing
    Andere elektronische Ausgabe
    OAI-PMH-ID
    • oai:doc.rero.ch:332850
    Summary
    We report the first observation of the annihilation of positronium from the 2S state. Positronium (Ps) is excited with a two-photon transition from the 1S to the 2S state where its lifetime is increased by a factor of eight compared to the ground state due to the decrease in the overlap of the positron electron wave-function. The yield of delayed annihilation photons detected as a function of laser frequency is used as a new method of detecting laser-excited Ps in the 2S state. This can be considered the first step towards a new high precision measurement of the 1S-2S Ps line.