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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 .

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