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The s andw variations of the np charge-exchange (np-*pn) cross section are measured to be relatively smooth and without structure at intermediate energies-in sharp contast to previous results.

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The 0' neutron spectra resulting from 800 MeV proton bombardment of targets of Al, Ti, Cu, W, Pb, and U have been measured for neutron momenta above 500 MeV/c. Integrated cross sections for the quasielastic charge exchange peaks and the broad pion associated peaks at lower momenta show a remarkably smooth dependence on atomic mass of the target, varying as A "' and A '", respectively. NUCLEAR REACTIONS A1, Ti, Cu, W, Pb, U(p, n), E=800 MeV; measured cr (O'; P"); deduced A dependence of charge exchange and pion associated cross sections.