Measurement ofp+p→π++dat 90° and 5GeVc

The differential cross section for the process $p+p\to {\pi }^{+}+d$ was measured at 5.0 $\frac{\mathrm{GeV}}{c}$ for a center-of-mass angle of 90°. The experiment was done on the Argonne ZGS with the same apparatus as was used in a recent 90° proton-proton elastic scattering experiment. The extracted proton beam of the ZGS was made to impinge upon a C${\mathrm{H}}_2$ target. The pion and deuteron were detected by two spectrometers, each containing magnets and a scintillation-counter telescope, in coincidence. The incident beam flux was measured by a radiochemical analysis of the C${\mathrm{H}}_2$ target. The 90° cross section at 5.0 $\frac{\mathrm{GeV}}{c}$ was found to be 35±9 nb/sr.