Abstract

He ions have been detected in coincidence with charged pions in the reactions 16O on 27Al at E lab = 94 MeV/u. We analyse velocity spectra and cross-sections of He ions emitted in the angular range 4 0 ÷ 150 0 in coincidence with charged pions detected at 90 0. A two source emission mechanism of the helium particles and a pion statistical production from an equilibrated participant zone is stressed. The absolute yields at different angles are compared with results of a theoretical model for medium energy heavy ion reactions in the frame f a participant-spectator picture. A comparison of the pion energy spectra with Boltzmann-Nordheim-Vlasov calculations and a discussion on the time scale for pion emission is also presented.

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