INCLUSIVE POSITIVE PION-PHOTOPRODUCTION

Inclusive pi(+) photoproduction below the Delta(1232) resonance has be en measured from H, C, Ca, Sn, and Pb at laboratory angles of 51 degre es, 81 degrees, 109 degrees, and 141 degrees using tagged photons and Delta E-E plastic scintillator telescopes with 17-MeV thresholds. Part icle identification involved both the determination of differential en ergy loss and the detection of the mu(+) from the pi(+) decay. Double differential cross sections, angular distributions, and total cross se ctions were obtained for four incident photon energy bins centered at 184, 193, 204, and 213 MeV, Comparisons are made to both theoretical p redictions and previous data sets. Ratios of nuclear cross sections to those obtained from the proton are extracted, and the features of the se ratios are discussed.