We have measured the Compton electron spectrum coming from photons produced from the decays of ${\pi }^0$ mesons. The production rate agrees well with that predicted from the Klein-Nishina formula. The agreement, expressed as a ratio $R$ between the predicted and the measured numbers of Compton electrons, is as follows: For Compton-electron energies between 0.1 and 5.0 GeV, $R=1.03\mathrm{}\pm 0.07$; for energies between 0.8 and 5.0 GeV, $R=0.95\mathrm{}\pm 0.14$.

• Received 22 February 1978

DOI:https://doi.org/10.1103/PhysRevD.18.1351