Two-prong pi(-4) He interactions at 106 MeV

pi He-4 interactions at 106 MeV, with two secondary charged particles in the final state, have been studied using a self-shunted streamer charnber in a 0.65 T magnetic field and equipped with two CCD videocameras for obtaining digitized stereo-images of nuclear events occurring within the fiducial volume of the streamer chamber. Branching. ratios for the various interaction channels are deduced. Evidence is presented for a reaction channel involving a gamma produced in the final state, as well as for the first observation of direct Delta(-)-resonance production. Cross-section distributions for the elastic and quasi-elastic interaction channels are also reported.