Role of Coupled-Channels in Heavy Ions Reactions at the Coulomb Barrier

The effect of the coupled channel on the calculations of the total fusion reactions cross section sigma (fus) and the fusion barrier distribution have been studied for the reactions involving heavy ions nuclei for the systems 16O on 144, 154Sm. The effect of double, octupole and quadrupole phonon excitations in144Sm were considered and rotational deformation were included for the nucleus 154Sm with ground state rotational band up-to the 4+ states. The calculated fusion reactions cross section and the fusion barrier distribution are compared with the available experimental with and without the inclusion of the coupled channels effects. The inclusion of the coupled channel in the calculations enhances the fusion cross section below the Coulomb and brings the calculated fusion reaction cross section near to the experimental data.