Precision Measurement of the Hyperfine Interval of Muonium by a Novel Technique: Ramsey Resonance in Zero Field
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A novel method for measuring the hyperfine interval of muonium in "zero" magnetic field is described. It consists in applying two successive coherent microwave pulses (lengths , separation T) to muonium, and observing the change in muon polarization at t>T+2. By extrapolating two low-pressure runs in Kr we obtain (0)=4463.3013(40) MHz, while a joint fit with earlier Chicago Kr data gives (0)=4463.3012(23) (0.5 ppm). With ffp=3.183 338(13) this implies (a) -1-137=0.036 19(30) (2.2 ppm) and (b) a proton polarizability N(2)=-(44) ppm. 1971 The American Physical Society.