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

Cooke DA, Crivelli P, Alnis J, Antognini A, Brown B, Friedreich S, Gabard A, Haensch TW, Kirch K, Rubbia A & Vrankovic V
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Cooke, D. A., Crivelli, P., Alnis, J., Antognini, A., Brown, B., Friedreich, S., … Vrankovic, V. (2015). Observation of positronium annihilation in the 2S state: towards a new measurement of the 1S-2S transition frequency. Hyperfine Interactions, 233, 67-73. https://doi.org/10.1007/s10751-015-1158-4