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We have measured the cross section, the angular distribution, and the A polarization for the reaction ir~p-+ Aif°. A spark-chamber spectrometer was used to collect 8400 AK° events at fourteen beam momenta near ZK threshold. Our data do not show the prominent cross-section enhancement suggested by some previous experiments. However, detailed structure in the cross section and the angular distribution agrees well with a simple model which includes a cusp effect at Z;K threshold.

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