Abstract
Measurements of Zeeman transitions in the ground state of muonium at strong magnetic field have yielded values for the hfs interval, $\ensuremath{\Delta}\ensuremath{\nu}=4463302.35(52)$ kHz (0.12 ppm) and for the muon magnetic moment, $\frac{{\ensuremath{\mu}}_{\ensuremath{\mu}}}{{\ensuremath{\mu}}_{p}}=3.1833403(44)$ (1.4 ppm), of considerably higher precision than previous results. The theoretical expression for $\ensuremath{\Delta}\ensuremath{\nu}$, including our measured value of $\frac{{\ensuremath{\mu}}_{\ensuremath{\mu}}}{{\ensuremath{\mu}}_{p}}$, disagrees with the experimental value by 2.5 standard deviations. The electronic ${g}_{J}$ density shift for muonium in Kr has been measured.
Published Version
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