Fusion studies in Cl 35,37 + Ta 181 reactions via evaporation residue cross section measurements

The fusion evaporation residue (ER) excitation function has been measured for Cl35,37+Ta181 reactions at energies above the Coulomb barrier. The measurements were performed using the HYbrid Recoil mass Analyzer at IUAC, New Delhi. Comparable ER cross sections have been observed in both reactions and there is no isotopic dependence. Measured ER cross sections were compared with theoretical calculations employing the dinuclear system model at projectile and target nuclei interaction and statistical model for the deexcitation of the formed compound nucleus. Larger ER cross sections at the complete deexcitation cascade of the formed compound nucleus are noticed in both reactions at higher excitation energies (E>80 MeV) over the calculated results. Fusion probability varies from 95% to 40% in the excitation energy range of the study. No appreciable difference in the fusion probability is noticed in the two reactions. Comparison of our results with other reactions populating Th216 shows a very strong entrance channel dependence.