NUCLEAR REACTIONS H-2, C-12, Al-27(gamma . pi + X), E=176 MeV, measured sigma,sigma(theta, E). Comparison with other data and intranuclear cascade model/k The very first data from MAX-lab in Lund, Sweden on pion photoproduction at threshold energies are presented. The decrease of the total pi(+) yield in gamma + C-12, Al-27 reactions below 200 MeV as well as the d sigma/d Omega cross-section data essentially follow the predictions of an intranuclear-cascade model with an attractive potential for the pion-nucleus interaction. However, d(2)sigma/d Omega dT, cross-section data at 176 MeV show deviations which call for refinements of the model and possibly also for the inclusion of coherent pion-production mechanisms.
2008. Vol. 806, 216-229 p.