Within the framework of the proximity potential model, for the first time, we have studied the role of surface tension effects in the isotopic behavior of the height and position of the fusion barriers of 207 different isotopic systems with neutron rich compound nuclei (1≤N/Z≤1.574). To reach this aim, we have calculated the interactions potentials by entering six sets of (γ0, ks) coefficients in the original version of the proximity potential and have presented the parameterized formulas for fusion barrier heights and positions which simultaneously depend on the N/Z ratio and surface energy coefficient γ. The obtained results reveal that the sensitivity of the isotopic behaviors of the position and height of the fusion barriers increases and decreases by increasing the surface tension effects, respectively.

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