Nuclear reactions studied by quasi-elastic measurements with high precision at backward angles

China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China

^a e-mail: cjlin@ciae.ac.cn

Abstract

The excitation functions of quasi-elastic scatterings at backward angles were measured with high precision to study the mechanisms of heavy-ion reactions at near- and sub-barrier energies. The surface diffuseness parameters for the ¹⁶O+^144,152,154Sm, ¹⁷⁰Er, ¹⁷⁴Yb, ^184,186W, ^194,196Pt, and ²⁰⁸Pb systems have been extracted by the single-channel and coupled-channels calculations, respectively. No anomaly was found in these quasi-elastic processes. The barrier heights and barrier distributions were systematically investigated for these systems. Moreover, the coupled-channels effects of neutron transfers with positive Q-value and the breakup effects of weakly-bound nuclei on the fusion processes were also studied for the ³²S+^90,96Zr systems and the ^6,7Li, ⁹Be+²⁰⁸Pb systems, respectively.