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Neck formation and sub-barrier fusion of heavy-ion systems: 64Ni+100Mo and 80Se+80Se.

The fusion of [sup 64]Ni+[sup 100]Mo and [sup 80]Se+[sup 80]Se has been studied near and just below the Coulomb barrier. Fusion cross sections and average angular momenta have been calculated in a realistic neck formation fusion model based on barrier penetration, deformations, vibrations, and neck formation. The results agree well with the experimental data.