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An analysis of 3587 r + -• ir J nr + -\-w + decay events is presented. These events were found in an area scanning of an emulsion stack of 600-jx Ilford G5 emulsion pellicles exposed to a 300-MeV/c separated K + beam at the Bevatron of the Lawrence Radiation Laboratory. The pion energy spectra are compared with the predictions of linear-matrix-element theory, the pion-pole model, and the s-wave resonance model, and with the existing spectra of the secondaries from 17, T*, T', and K2*.

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The energy spectrum of the decay pions in T+ decay was obtained from a sample of 17 898 events. I t is found that the spectrum is adequately fitted by a squared matrix element of linear form, jMI2= l + a , X ( l b f~Q / m ,~) Y, with u7=0.131f 0.008. No evidence for C P noninvariance is found for T+ decays. A significant violation oi the 41= 4 rule is observed ior Kf -+ 37r decays Comparison with several theoretical models for K -+ 37r decays s11ou.s fair agreement betneen experiment and theory.

From a 98 000-photograph exposure of the BNL 80-in. deuterium-filled chamber to a 14.ti-GeV/c P beam we have extracted those events that fit the channelfic -D a -The cross section for this channel is measured to be 730 * 50 pb. The cross section f o r the reaction& -i%--(1238)p is determined to be 130 = 30 pb. Evidence for target dissociation is presented. A comparison with the reaction a-t~ .-71-p i~-at the same energy indicates agreement with factorization.