  A detailed study fusion of neutron-rich colliding nuclei is performed using
various isospin dependent potentials. For present study, Three different series
namely, Ne-Ne, Ca-Ca, and Zr-Zr are taken into account and N/Z ratio.A
monotonous increase (decrease) in the fusion barrier positions (heights) using
a unified second order nonlinear parametrization in the normalized fusion
barrier positions and heights with (N/Z-1) is presented. These predications are
in good agreement with the available theoretical as well as experimental
results.
