Collision damping in the pi 3He -> d'N reaction near the threshold
  We present a simple quantum mechanical model exploiting the optical potential approach for the description of collision damping in the reaction pi 3He -> d'N near the threshold, which recently has been measured at TRIUMF. The influence of the open d'N -> NNN channel is taken into account. It leads to a suppression factor of about ten in the d' survival probability. Applications of the method to other reactions are outlined. 
A.V.Nefediev (IST, Lisbon and ITEP, Moscow), M.G.Schepkin (ITEP,   Moscow), H.A.Clement (Tuebingen University)