Study of fusion in ^6,7Li+¹⁹⁷Au at near barrier energies

¹ Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai - 400005, INDIA
² India based Neutrino Observatory, Tata Institute of Fundamental Research, Mumbai - 400005, INDIA
³ Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai - 400085, INDIA

^a e-mail: nanal@tifr.res.in

Abstract

Excitation functions are measured for complete fusion and transfer reactions of ⁶Li and ⁷Li with ¹⁹⁷Au at energies around the Coulomb barrier. Coupled channel calculations including the couplings to both target and projectile excited states have been performed and are found to explain the data at energies below the barrier. At above barrier energies the complete fusion cross sections are found to be suppressed compared to the coupled channel calculations for both the systems. A systematic comparison of fusion cross-section for halo nuclei ^6,8He and weakly bound stable nuclei ^6,7Li on ¹⁹⁷Au target is also presented. Large neutron transfer cross-sections are observed for ^6,7Li as compared to tightly bound projectiles ¹²C,¹⁶O.