A set of parameters has been derived for a global optical potential from elastic a-nucleus scattering with energies higher than 80 MeV. The geometry and energy dependence derived by Put and Paans was adopted. The optical model predictions were tested with data from elastic as well as from inelastic scattering.

Differential cross sections of elastic scattering of deuterons on the target nuclei 'Al, Y, ' Sn, and Pb were measured at Ed --58.7 MeV and Ed --85 MeV. "Best-fit" parameters in terms of the phenomenological optical model were extracted from the data including in addition differential cross section and analyzing power data from the literature. A set of global optical potential parameters is derived.

6 A thorough review of the general features of strongly damped collisions is contained in W. U. Schroder and J e R. Huizenga, Annu. Rev. Nucl. Sci. 2_7, 465 (1977).In connection with preequilibrium reaction theories, there has been growing interest in the study of continuous spectra of particles emitted in nuclear reactions. In the present investigation spectra of 3 He particles emitted in reactions induced by 172.5-MeV a particles on 58.eo.62.64 Ni targets have been studied in the energy range from 50 to 160 MeV (lab). The experiment has been performed at the Julich isochronous cyclotron JULIC in a 100-cm-diam scattering chamber Two AE-E semiconductor telescopes were used, 7 R. Vandenbosch

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A stack of annular detectors made of high purity germanium was used to measure simultaneously pd → 3 H π + and pd → 3 He π 0 differential cross sections at beam momenta of 750 MeV/c, 800 MeV/c, and 850 MeV/c over a large angular range. The extracted total cross sections for the pd → 3 He π 0 reactions bridge a gap between near threshold data and those in the resonance region. The ratio of the cross sections for the two reaction channels taken at the same η = p cm π /m π yields 2.11±0.08 indicating that a deviation from isospin symmetry is very small.