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Excitation functions for quasi-elastic scattering (elastic, inelastic and transfer) were measured for the 16O +64 Zn, 17O +64 Zn and 18O +64 Zn systems, at backward angles of 161◦, in the laboratory reference system, and in the energy range between 30.0 and 46.0 MeV using steps of 0.5 and 1.0 MeV , for energies below and above the Coulomb barrier. Performing a derivative on experimental data we obtained the quasi-elastic barrier distributions for the three systems, which are equivalent to the fusion barrier distributions, and make evident the reaction mechanisms of the system. To obtain these data a good charge resolution ”Z” of a gas proportional counter, E −∆E, was necessary and also the use of surface barrier detectors placed at forward angles, ±30◦ and −45◦ for normalization. A theoretical analysis of the data was performed using the coupled reaction channel model CRC through the use of FRESCO [Thom 88] and CQUEL [Hagi 04] (a new version of CCFULL [Hagi 99]). To avoid the use of free parameters, in our calculations, we decided to use the real potential of the double-folding Sao Paulo Potencial [Cham 02], which describes physically the nucleus-nucleus interaction. It is based on Pauli non-locality and is characterized by the exchange of nucleons. The

Estudo do acoplamento dos canais diretos de reação nos sistemas 16,17,18O + 64Zn