[en] In this contribution we report an experiment held at the CERN synchrocyclotron with the 85 A-MeV ₁₂C beam and a preliminary interpretation of the data in terms of a nucleon-nucleon first collision model. Note that in order to illuminate any collective behaviour it would even be preferable to compare the pion production in the ₁₂C-Nucleus reaction to the incoherent sum (internal momenta being taken into account) of nucleon induced reactions such as N + Nucleus → π + anything. Surprisingly enough, to our knowdge no extensive data exist for inclusive pion production in p-Nucleus collision at energies between approximately 140 MeV (absolute threshold) and 300 MeV