Article révisé par les pairs
Résumé : The dynamical effects of the entrance channel on the competition between quasifission and fusion processes, and on the evaporation residue formation are investigated. We have analyzed the results and compared our calculations with the experimental data obtained in the 16O + 204Pb and 96Zr + 124Sn reactions having very different mass asymmetries and leading to the 220Th* compound nucleus. We have found that different partial capture cross-sections σlcap(E) for these reactions lead to different fusion-quasifission competitions and, consequently, to different partial fusion cross-sections σlfus(E) of the compound nucleus formed in the two reactions. The dynamical conditions also affect the fission-evaporation competition of the excited intermediate nuclei along the CN de-excitation cascade and, consequently, the evaporation residue formation. © Società Italiana di Fisica/Springer-Verlag 2004.