• In the calculations, rro,s we re asswned to be detected if both of the decay photons would enter the lead-glass hodoscope. As can be seen from Fia_ 2, the photon detector should provide information on rro production over much of the forward hemisphere. The resulting data on lT o production are expected to be of value in, e. g. studies of pion diffraction dissociation involvina rr and perhaps or w mesons. As mentioned earlier, the photon detector will be used in only a portion of the proposed exposure. It may be possible in the remaining portion of the exposure, to obtain some information about the production of forward gamma rays from the electromagnetic showers detected in the neutral hadron calorimeter described in P-394. VI. ANALYSIS OF EXPERIMENTAL DATA Physichts at Notre Dame and Duke have had extensive past experience with measurement and analysis in previous experiments involving the Ft~rmilab 30­ inch bubble chamber. Notre Dame and Duke, together with Toronto and McGill, have analyzed ZOO GeVIc IT·p events from experiment /I ZB. Duke has studied ZOO GeV/c lI'-Ne interactions in experiment 1# 163A and is approved for a study of 300 GeV/c rr- -highZ interactions in the 30-inch chamber in experiment II 304. Notre Dame is currently collaborating with Iowa State, Maryland, and Michigan State in the analysis of 360 GeV Ic IT·p - 16 ­ interactions from experiment # l