Systematic study of the fusion barriers using different proximity-type potentials for N = Z colliding nuclei: New extensions

By using 14 different versions and parametrizations of a proximity potential and two new versions of the potential proposed in this paper, we perform a comparative study of fusion barriers by studying 26 symmetric reactions. The mass asymmetry eta(A) = (A(2)-A(1)/A(2)+A(1)), however, is very large. Our detailed investigation reveals that most of the proximity potentials reproduce experimental data within +/- 8% on average. A comparison of fusion cross sections indicates that Bass 80, AW95, and Denisov DP potentials have a better edge than other potentials. We also propose new versions of the proximity potential as well as Denisov parametrized potential. These new versions improve agreement with the data.