Isotopic dependence of fusion cross sections in reactions with heavy nuclei

The dependence of fusion cross section on the isotopic composition of colli ding nuclei is analysed within the dinuclear system concept for compound nu cleus formation. Probabilities of fusion and surviving probabilities, ingre dients of the evaporation residue cross sections, depend decisively on the neutron numbers of the dinuclear system. Evaporation residue cross sections for the production of actinides and superheavy nuclei, listed in table for m, are discussed and compared with existing experimental data. In the Pb-ba sed reactions neutron-rich radioactive projectiles are shown to lead to sim ilar fusion cross sections as stable projectiles. (C) 2000 Elsevier Science B.V. All rights reserved.