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

@article{Cooke2015ObservationOP,
  title={Observation of positronium annihilation in the 2S state: towards a new measurement of the 1S-2S transition frequency},
  author={D. A. Cooke and P. Crivelli and J. Alnis and A. Antognini and B. Brown and S. Friedreich and A. Gabard and T. H{\"a}nsch and K. Kirch and A. Rubbia and V. Vrankovic},
  journal={Hyperfine Interactions},
  year={2015},
  volume={233},
  pages={67-73}
}
  • D. A. Cooke, P. Crivelli, +8 authors V. Vrankovic
  • Published 2015
  • Physics
  • Hyperfine Interactions
  • 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… CONTINUE READING
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