We found that the ?N/Z? value in neck region is clearly large at the early stage of neck formation in neutron?rich nuclei reactions, which cause the lowering of dynamical Coulomb barrier and thus enhance the fusion cross section.

• 在分析丰中子核熔合截面增强机制中；发现丰中子核熔合反应初始阶段颈部的N/Z值明显偏大；促使反应中动态位垒降低；从而引起了丰中子核反应熔合截面的增强.