Abstract
We report the first measurement of the polarization of thermal muonium in vacuum. A 20 MeV/c beam of μ+ was stopped in a layer of SiO2 powder which emitted (17±1)% of the stopped μ+ into vacuum as thermal muonium. The muonium Larmor precession was observed in a transverse magnetic field of 1.4 G, and the measured amplitude of the precession signal indicates that the μ+ polarization in the muonium is (39±9)%.
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Woodle, K.A., Arnold, K.P., Gladisch, M. et al. Measurement of the polarization of thermal muonium in vacuum. Z Phys D - Atoms, Molecules and Clusters 9, 59–64 (1988). https://doi.org/10.1007/BF01384448
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DOI: https://doi.org/10.1007/BF01384448