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中文摘要：
精确测量了^32S＋^90,96Zr两系统的背角准弹散射激发函数，总体误差小于1％，从中分别抽取了它们的势垒分布，对比观测到^32S＋^96Zr的势垒结构扁平且向低能区展宽，这种势垒可导致在垒下能区该体系的熔合截面的大大增强^32S＋96Zr与^32S＋^90Zr相比存在较强的中子转移反应，且转移Q值为正^32S＋^96Zr势垒的扁平结构可能是中子转移道耦合所致，这会导致^32S＋96Zr垒下熔合截面大的增强．
英文摘要：
Quasi-elastic cross sections have been measured for ^32S＋^90,96Zr with high accuracy near the Coulomb barrier at backward angles and the barrier distributions are extracted from them. We find that barrier distribution of ^32S＋^96Zr is flat and extends to low energies. The sub-barrier fusion cross sections are strongly enhanced because of such barrier distribution. Compared with the reaction of ^32S＋^90Zr, ^32S＋^96Zr has stronger neutron transfers up to the six-neutron pickup, which is due to the positive Q values of neutron transfers in the latter. This indicates that the neutron transfer may play a role in the enhancement of sub-barrier fusion for ^32S＋96Zr.
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