New experimental information is presented about the effect of a nucleus on patrons which have undergone a hard scatter. We have observed clear dijet events from 400 GeV/c p-nucleus interactions and compared them to dijets from pp interactions. Our results show that the angular width of the individual jets is only slightly affected by the presence of the nucleus, but the acoplanarity of the jet pairs is sharply increased.

Measurements are reported of the difference AuL between proton-proton total cross sections for parallel and antiparallel spin states and of the parameter CLL for proton-proton elastic scattering near 90", for thirteen energies between 300 and 800 MeV. The AaL results agree well with previous ANL ZGS and SIN data, but disagree with recent results from TRIUMF. Attempts to understand the cause of the discrepancy have been unsuccessful, but possible sources are discussed. The AUL and CLL results have been used with other experimental data to extract quantities which depend only on spin-singlet, coupled spin-triplet, and spin-triplet partial waves. Structure is found in these quantities, which appears to be associated with the resonantlike 'D2 and 3F3 partial waves. Additional similar structure is also found, which may be due either to the 'Po partial wave or the ( 3~2 , 3~2 ) partial-wave pair.

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