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First results for 16 0(TT *, TT ± p) 15 N g . s . at 240 MeV for 0 n = 35°, 60°, and 130° in quasifree kinematics are reported. TT + /7T~ cross-section ratios much greater than for scattering by free protons are interpreted as due to a A-TV interaction interfering with the quasifree process.

Cross sections, pion momentum spectra, and angular distributions for the reactions n C(n~\n + n~) and X2 C (K~,2n~) at a bombarding energy of 292 MeV were measured with a 360° spectrometer. An enhancement of the cross-section ratio of ,2 C(;r~,2/r -) to n C(n~\JZ* K~) relative to that of the elementary cross sections was observed, and is discussed in terms of various nuclear-medium effects including a double-A production channel.