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- W2146386900 abstract "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'erot cavity. The hyperfine transition has been observed with a significance of 5.4 standard deviations. The transition probability is measured to be $A={3.1}_{ensuremath{-}1.2}^{+1.6}ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}8}text{ }text{ }{mathrm{s}}^{ensuremath{-}1}$ for the first time, which is in good agreement with the theoretical value of $3.37ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}8}text{ }text{ }{mathrm{s}}^{ensuremath{-}1}$." @default.
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- W2146386900 date "2012-06-20" @default.
- W2146386900 modified "2023-10-03" @default.
- W2146386900 title "Direct Observation of the Hyperfine Transition of Ground-State Positronium" @default.
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- W2146386900 doi "https://doi.org/10.1103/physrevlett.108.253401" @default.
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