PREEQUILIBRIUM GAMMA-RAY EMISSION IN COMPLETE AND INCOMPLETE FUSION REACTIONS IN THE COLLISION C-12-64 AT 8 MEV(NI)NUCLEON/

gamma rays emitted in coincidence with charged particles have been mea sured in the collision C-12+Ni-64 at 94.7 MeV. The gamma spectrum dete cted in coincidence with evaporation residues has been fitted using th e statistical code CASCADE and does not show clear evidence for nonsta tistical emission, gamma spectra measured in coincidence with fast, fo rward emitted alpha particles show a contribution around 10 MeV which has been interpreted as being due to preequilibrium dipole emission in the first stages of the collision. The presence of this nonstatistica l yield has been explained performing theoretical calculations based o n the Boltzmann-Nordeim-Vlasov equation.