Measurements of Two-Particle Production in 400 Gev/c Proton-Nucleus Collisions.

Results are presented for an experiment which used a double-arm magnetic spectrometer to perform inclusive measurements of two particle production in 400 GeV/c proton-nucleus collisions. The apparatus detected two particles with an azimuthal separation of approximately 180 deg which were produced near a rapidity of -0.4 in the proton-nucleon center-of-mass system. Charged hadrons which were produced in polyethylene, beryllium and lead targets, were identified over the transverse momentum range from 1 to 1.8 GeV/c. The dependence of the production on the number of nucleons (A) in the target nucleus is parameterized. Both the transverse momentum and quantum number correlations are very much reduced by using a lead target.