Abstract
We review some experimental results which cannot be understood within the usual concepts of dissipative collisions. We present a dynamical model in which fast fission phenomenon appears in a natural way if certain conditions are fulfilled. Two kinds of fast fission are described, according to the size of the system. An extended notion of the so called fusion process is proposed and calculations of fusion cross sections are compared with experimental data. The fluctuations associated with the collective variables which are involved during fast fission and compound nucleus fission are treated within the framework of the linear response theory. The study of mass distributions supports the existence of fast fission with medium systems as an intermediate mechanism between the deep inelastic collisions and the compound nucleus formation.
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