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The differential cross-section for [...] has been measured for a center of mass angle of 90[degrees] and for photon energies between 1100 MeV and 1300 MeV. Range telescopes detected both the [positive kaon] and the proton from the [lamda-hyperon] decay. This experiment was performed in collaboration with D. E. Groom, who measured the polarization of the [lamda] hyperon in the above reaction. The electronic instrumentation for this experiment is emphasized here. The differential crosssection was found to remain nearly constant at [...] over the above energy interval.