Decay Width of the NeutralπMeson

The cross section for the photoproduction of ${\pi }^0$ mesons from complex nuclei at small angles has been measured at incident bremsstrahlung energies of 4.4 and 6.6 GeV. The data are fitted by a cross section calculated from a sum of Primakoff and nuclear-production amplitudes. A total decay width for the ${\pi }^0$ meson of 8.02±0.42 eV is obtained from the magnitude of the Primakoff amplitude.