The cross section for the photoproduction of eta mesons by the Primakoff process has been measured at bremsstrahlung energies of 5.8, 9.0, and 11.45 GeV. A value of 0.324 ± 0.046 keV was obtained for the partial width of the eta meson decaying into photon pairs. This result is a factor of 3 lower than the previously accepted value.
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