A new measurement is described which sets an upper limit on the coupling constant for conversion of muonium (μ⁺e^-) to antimuonium (μ^-e⁺) of 42GF, where GF is the Fermi coupling constant. Muonium atoms were formed in layers of fine silica powder separated by vacuum drift regions. The presence of μ^- was searched for using the signature of a Ca 2P-1S muonic x ray from calcium oxide layers adjacent to the drift regions. Results were also obtained with an Ar target.
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Marshall et al. (1982) studied this question.
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