The reaction π − p → ηn is investigated within a dynamical coupled-channels model of meson production reactions in the nucleon resonance region. The meson baryon channels included are πN, ηN, π , σ N, and ρN. The nonresonant meson-baryon interactions of the model are derived from a set of Lagrangians by using a unitary transformation method. One or two excited nucleon states in each of S, P , D, and F partial waves are included to generate the resonant amplitudes. Data of the π − p → ηn reaction from threshold up to a total center-of-mass energy of about 2 GeV are satisfactorily reproduced and the roles played by the following nine nucleon resonances are investigated: . The reaction mechanism and the predicted ηN scattering length are discussed.

Spallation neutron production in proton induced reactions on Al, Fe, Zr, W, Pb and Th targets at 1.2 GeV and on Fe and Pb at 0.8, and 1.6 GeV measured at the SATURNE accelerator in Saclay is reported. The experimental double-differential cross-sections are compared with calculations performed with different intra-nuclear cascade models implemented in high energy transport codes. The broad angular coverage also allowed the determination of average neutron multiplicities above 2 MeV. Deficiencies in some of the models commonly used for applications are pointed out.

The p6Li i q'Be reaction has been investigated at Tp,= 683 MeV using the Satume synchrotron. ' 1 mesons were detected wilh the high-resolution light neulral m m n spectrometer PINUT. The small-angle CM differential mass section for the production of the sum of the first few levels of 'Be was found to be 4.6 f 3.8 nb sr-'. This value is about one o d e r of magnitude less than that for the pd -+ q'He reaction at lhe Same q CM momentum.