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We perform exact coupled-channels calculations, taking into account properlythe effects of Coulomb coupling and the finite excitation energy of collectiveexcitations in the colliding nuclei, for three Fm formation reactions,$^{37}$Cl + $^{209}$Bi, $^{45}$Sc + $^{197}$Au, and $^{59}$Co + $^{181}$Ta. Forthe $^{37}$Cl + $^{209}$Bi and $^{45}$Sc + $^{197}$Au reactions, thosecalculations well reproduce the experimental total fission cross sections, anda part of the extra-push phenomena can be explained in terms of the Coulombexcitations to multi-phonon states. On the other hand, for the heaviest system,the deep-inelastic collisions become much more significant, and the fissioncross sections are strongly overestimated. We also discuss the surprisinglylarge surface diffuseness parameters required to fit recent high-precisionfusion data for medium-heavy systems, in connection with the fusion supressionobserved in massive systems.Comment: 10 pages, 6 ps figures. Uses aipxfm.sty. A talk given at the Tours  Symposium on Nuclear Physics V, August 26 - 29, 2003, Tours, Franc

Fusion dynamics around the Coulomb barrier