Antiproton-4He annihilation at rest

The analysis of about 4*10^6 annihilation events at rest, collected with the Obelix spectrometer at Lear, is presented. In some reaction channels with 4 or 5 charged particles in the final state, a preliminary evaluation of the absolute branching ratios for two-nucleon annihilations is made. Moreover, the production of mesonic and baryonic resonances is studied, and for the first time the Pontecorvo reactions antiproton-4He --> 2pi- 3p is observed.