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The spectrum of electrons arising from the decay of the negative mu meson has been determined. The muons are arrested in the gas of a high-pressure hydrogen-filled diffusion cloud chamber. The momenta of the decay electrons are determined from their curvature in a magnetic field of 7750 gauss. The spectrum of 415 electrons has been analyzed according to the theory of Michel. The shape parameter, ρ, is found to be 0.64±{}0.10. The significance of this result in terms of the beta interaction is discussed.
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Sargent et al. (1955) studied this question.
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