Abstract
The present paper describes an experiment designed to measure the angular asymmetry of the neutrons emitted when polarized muons are captured by nuclei. The nuclide used was sulphur. After correcting for the depolarization of the muon beam we obtained a value of -0.22 ± 0.07 for the asymmetry parameter. The non-zero result confirms the violation of parity conservation in the muon capture process, and the magnitude of the effect suggests the presence of an effective pseudoscalar term in the transition amplitude for the fundamental process μ- + p → n + v.
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