An effective method to calculate the potential energy of a dinuclear system is suggested. The nuclear part of the nucleus-nucleus potential is taken in the double folding form. The analytical expressions obtained allow one to simplify the calculations of interaction between two nuclei except the nuclei near the drip lines. The relationship between the double folding potential and the proximity potential is found. The influence of a deformation and a relative orientation of nuclei on the interaction potential is investigated. The method is applied to the calculations of the energies of the dinuclear and trinuclear systems.

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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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