Observation of positronium annihilation in the 2S state: towards a new measurement of the 1S-2S transition frequency
Cooke, D. A. · Crivelli, P. · Alnis, J. · Antognini, A. · Brown, B. · Friedreich, S. · Gabard, A. · Haensch, T. W. · Kirch, K. · Rubbia, A. · Vrankovic, V.
Original · EN
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 wavefunction. 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.
English translation
This paper has no Arabic translation yet. Be the first: it takes a few seconds, and the result is stored for every future reader.