New higher precision measurements of the hyperfine Zeeman transitions in the ground state of muonium have been performed with use of the high-stopping-density surface \i + beam at the Clinton P 0 Anderson Meson Physics Facility. The results are Ay = 4 463-302.88(16) kHz (0.036 ppm) and n^/np^ 3.183 3461(11) (0.36 ppm). The current theoretical value of Ay agrees well with experiment within the 0.77-ppm error of Ay t^eor , which is due principally to inaccuracy in evaluation of the nonrecoil radiative correction term. The most precise current value of m n /m e is obtained from our value of \ij\x p ,
Brief Reports are short papers which report on completed research which, while meeting the usual Physical Review standards of scientific quality, does not warrant a regular article. (Addenda to papers previously published in the Physical Review by the same authors are included in Brief Reports.) A Brief Report may be no longer than 3f printed pages and must be accompanied by an abstract. The same publication schedule as for regular articles is followed, and page proofs are sent to authors.A discussion is given of the mechanisms by which a light scalar or pseudoscalar boson, such as a familon, may be emitted in the radiative decay of a muon. The results of a new experimental search for the decay p f +e + y f , where f is such a boson, are presented. The resulting bounds on the coupling strength are comparable to, but of wider validity than, those from p + -e + f .
We report the results of a measurement of the Lamb shift in the n =2 state of muonium. Muonium atoms in the metastable 2S state were produced by the beam-foil method and the formation rate was determined by observation of the Ly-a photons emitted when the metastable atoms were quenched in a static electric field. The Lamb shift (4'&") was measured through observation of the microwave-induced 2'S&&2-2'P&&2 transition with the result $&"=1042» MHz. This result is in agreement with the current theoretical value.
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