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The first data from MAX-lab in Lund, Sweden on pion production inphotonuclear reactions at threshold energies, is presented. The decrease of thetotal yield of pi+ in gamma + 12C, 27Al reactions below 200 MeV as well asdifferential, dsigma/dOmega, cross sections follow essentially predictions froman intranuclear cascade model with an attractive potential for pion-nucleusinteraction in its simplest form. Double differential, d2sigma/dOmegadT, crosssections at 176 MeV show, however, deviations from the model, which call forrefinements of nuclear and Coulomb potentials and possibly also for coherentpion production mechanisms.

Pion emission in 2H, 12C, 27Al, gamma pi+ reactions at threshold