  A variety of phenomena connected with the formation of a dinuclear complex is
observed in the heavy ion collisions at low energies. The dinuclear system
model allows us to analyze the experimental data and to interpret them by
comparison of the partial capture, fusion and evaporation residue cross
sections measured for the different reactions leading to the same compound
nucleus. The comparison of theoretical and experimental values of the mass and
angular distributions of the reaction products gives us a detailed information
about reaction mechanism forming the observed yields. The observed very small
cross sections of the evaporation residues may be explained by the strong
fusion hindrance and/or instability of the heated and rotating compound nucleus
and smallness of its survival probability. The fusion hindrance arises due to
competition between complete fusion and quasifission while the smallness of
survival probability is connected with the decrease of the fission barrier at
large excitation energy and angular momentum of compound nucleus.
