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Using the statistical model, we analyze deexcitation channels in excited neutron-deficient compound nuclei produced in fusion reactions with heavy ions. The results obtained without special adjustment to the selected evaporation channels are in good agreement with the experimental data near the maxima of excitation functions. The fusion probability, which is calculated with the dinuclear system model, is an important ingredient of the excitation function. Optimal reactions and evaporation channels for the production of neutron-deficient isotopes far from the stability line are proposed.where ⑄ 2 ϭប 2 /(2E c.m. ) is the reduced de Broglie wavelength and is the reduced mass. The Coulomb barrier can be assumed as a parabolic barrier with បϭ1 MeV. The probability of complete fusion P CN (E c.m. ,J) depends on the competition between the complete fusion and quasifission. PHYSICAL REVIEW C

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Formation and evolution of dinuclear systems in reactions of complete fusion are considered. Based on the dinuclear system concept, the process of compound nucleus formation is studied. Arguments confirming the validity of this concept are given. The main problems of describing the complete fusion in adi abatic approximation are listed. Calculations of evaporation residue cross sections in complete fusion reac tions leading to formation of superheavy nuclei are shown. Isotopic trends of the cross sections of heavy nuclei formation in complete fusion reactions are considered.

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