HADRON-NUCLEUS INTERACTIONS AT HIGH ENERGY*

Properties of energetic secondaries produced at large angles using 800 GeV incident protons are presented. H/sub 2/, Be, C, Al, Cu and Pb targets were used for the study. The yields for producing such secondaries vary as A/sup ..cap alpha../ where A is the atomic mass number of the target and ..cap alpha.. attains values as large as 1.6. There is evidence that jet-like events have ..cap alpha.. values approaching unity, indicating a hard scattering mechanism may be occurring. Events with large values of target-fragmentation energy have, on average, large values of energy in the central region and small values of forward-going energy. Energy flows and number of secondaries are independent of the target when events with similar amounts of energy in the central region are studied.