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A potential model to describe the total cross section of nuclear fusionreactions at low energies is proposed. It is shown that within an approach witha simple, single barrier potential a satisfactory description of data ishindered, while with models with more complex interactions, e.g., withtwo-barrier potentials, a good description of data can be achieved in a largeinterval of colliding nuclei and center of mass energies. In particular, thetwo-barrier model allows to describe data at low, sub-barrier energies wheredata exhibits a steep falloff of the cross section. It is also shown that theposition of the two barriers is almost independent up on masses of collidingnuclei. Comparison with available experimental data is presented as well.

Sub-barrier fusion of intermediate and heavy nuclear systems