Abstract
A precision measurement of the energy dependence of the asymmetry of the decay of the positive muon has been made with a wire spark-chamber spectrometer of large momentum acceptance. We find, as an average of runs at different fields and with different targets, $\ensuremath{\delta}=0.758\ifmmode\pm\else\textpm\fi{}0.010$, in agreement with the two-component neutrino theory.
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