Observation of Migdal's Effect in the Decays of Positively Charged Pions and Muons

摘要

The energy spectra of fast (10(1)-10(2) keV) electrons accompanying (+) (+) decays of positively charged pions ((+)) stopped in a nuclear emulsion are obtained. These spectra are compared with the analogous spectra obtained earlier for electrons accompanying the decay (+) ?(+). The comparison in question confirms qualitatively the hypothesis that, in either process, fast electrons appear via the mechanism based on Migdal's shakeup effect.