Effect of deformation and orientation on interaction barrier and fusion cross-sections using various proximity potentials

The effect of deformation and orientation on barrier height and barrier position is studied using different types of proximity potentials for some 52 colliding nuclei with mass asymmetry parameter in range of 0 to 0.96. Various proximity potentials like Prox 77, Prox 88, Prox 00, Bass 80 and Denisov DP are used to extract barrier characteristics. These potentials cover a wide range of barrier and have different isospin and asymmetry dependence. With the inclusion of deformations, the barrier height and barrier position gets modified along with a significant change in the curvature. In order to study the possible effect of these deformation and orientation dependent proximity potentials, application is made in the framework of Wong formula to O-, Ca- and Ni-based reactions in medium mass region in reference to available data on fusion cross-sections at around and above the Coulomb barrier energies. For 16O- and 48Ca-based reactions, Prox 77 gives better comparison with experimental data as compared to other potentials around the Coulomb barrier energies whereas for 64Ni-based reactions Prox 88 seems close to the experimental data. At energies above the Coulomb barrier Bass 80 and Denisov DP compete with each other. Angular dependence of cross-section is also studied. It is observed that deformation and orientation degree of freedom plays a significant role in reaction dynamics.