Comparative study of the radius of sensitivity of the optical model potentials for ${}^6$Li+${}^{58,64}$Ni and ${}^{16}$O+${}^{58,64}$Ni

Radii of sensitivity were estimated for the ${}^6$Li+${}^{58,64}$Ni system at energies near the Coulomb barrier. For comparison purposes, such radii were also estimated for stable ${}^{16}$O scattered from same target isotopes. The elastic scattering data were analysed with folded real potential generated from DDM3Y nucleon-nucleon interaction and an imaginary potential of volume Woods-Saxon form. The most sensitive radii for ${}^{16}$O+${}^{58,64}$Ni system are found to be energy independent and close to the strong absorption radius. For ${}^6$Li projectile, unlike its strongly bound counterpart, the crossing radius increases with decreasing energy. However, no two crossing situation has been observed for both ${}^6$Li+${}^{58,64}$Ni and ${}^{16}$O+${}^{58,64}$Ni systems at the top of the barrier.