A new procedure is developed for calculating the charge, mass, and kinetic energy distributions of quasifission products. The quasifission is treated within a transport model which describes a master equation for the evolution of the dinuclear system in charge and mass asymmetries and its decay along the internuclear distance. The calculated yields of quasifission products and their distributions in kinetic energy are in agreement with recent experimental data of hot fusion reactions leading to superheavy nuclei. The importance of shell and deformation effects in quasifission is noted. The preneutron and postneutron emissions as well as the fission of a heavy nucleus in the dinuclear system are considered.

Using the statistical model with collective enhancement of the level density, and the fission and neutron evaporation characteristics predicted in different theoretical models, we analyze the survival probabilities of even-even and odd superheavy nuclei. The dependence of the obtained results on the model input is discussed. The role of the collective enhancement factors in the level density is treated. For $Z>~114,$ the calculated ratios of the neutron evaporation width to the fission width and thus evaporation residue cross sections are strongly different with various models predicting nuclear properties.