Direct Observation of the Hyperfine Transition of the Ground State Positronium

Details Direct Observation of the Hyperfine Transition of the Ground State Positronium Direct Observation of the Hyperfine Transition of the Ground State Positronium

2012-04-05

arxiv.org/abs/1204.1129v1

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

We report the first direct measurement of the hyperfine transition of the ground state positronium. The hyperfine structure between ortho-positronium and para-positronium is about 203 GHz. We develop a new optical system to accumulate about 10 kW power using a gyrotron, a mode converter, and a Fabry-P\'{e}rot cavity. The hyperfine transition has been observed with a significance of 5.4 standard deviations. The transition probability is measured to be $A = 3.1^{+1.6}_{-1.2} \times 10^{-8}$ s$^{-1}$ for the first time, which is in good agreement with the theoretical value of $3.37 \times 10^{-8}$ s$^{-1}$.

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