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 16 O+ 144,152,154 Sm, 170 Er, 174 Yb, 184,186 W, 194,196 Pt, and 208 Pb 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 32 S+ 90,96 Zr systems and the 6,7 Li, 9 Be+ 208 Pb systems, respectively.
Highlights
The heavy-ion fusion reactions at near- and sub-barrier energies have been extensively investigated in both experiment and theory for ages
The barrier distributions extracted from these fusion data and the CC calculations including the neutron transfer channels were presented in Ref. [25] and [34]
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
Summary
The heavy-ion fusion reactions at near- and sub-barrier energies have been extensively investigated in both experiment and theory for ages. Large numbers of open questions still remain to be solved, for instance, i) the surface diffuseness anomaly in interaction potential [1,2,3], ii) the coupled-channels effects of neutron transfers with positive Q value [4,5,6], iii) the breakup effects of weakly-bound nuclei on the fusion processes [7,8,9,10], and so on. Quasi-elastic scatterings and fusion reactions are complementary processes because they undergo the same interaction potential and share the mutual information on the reaction mechanism. The backward quasi-elastic measurements were employed in experiment to probe the surface diffuseness parameter [11,12,13,14,15], the barrier distribution [16,17,18,19,20], etc., in the past years
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