当前,近库仑势垒能区重离子核反应机制的研究已取得了长足的进步,对其特有的耦合道效应也有了深刻的认识。然而,由于耦合道效应的特性,对于具体的反应体系,仍需要实验确定其影响的程度。通过对α+232Th体系的弹性散射和熔合-裂变角分布进行测量,研究该体系耦合道效应对熔合-裂变激发函数的影响。实验是在中国原子能科学研究院的HI-13串列加速器上完成的。测量了γ入射能量在18~30 MeV之间的共14个能点的弹性散射和熔合裂变碎片角分布,并用15 MeV处的弹性散射对探测 At present, the research on the mechanism of heavy ion nuclear reaction in the near-Coulomb barrier energy region has made considerable progress, and also has a profound understanding of its unique coupling-channel effect. However, due to the nature of the coupling channel effect, it is still necessary to experimentally determine the extent of its influence on a specific reaction system. The influence of the coupling effect of the system on the fission excitation function was studied by measuring the elastic scattering and fission angle distribution of α + 232Th system. The experiment was performed on the HI-13 Tandem Accelerator of China Institute of Atomic Energy. Elastic scattering and fusion fission fragment angular distribution of 14 energy points with γ incident energies between 18 and 30 MeV were measured and measured by elastic scattering at 15 MeV