2025/10/30 by Wang, Ning, Duan, Yi-Jie, Yao, Hong +1
#FOS: Physical sciences #Nuclear Theory (nucl-th)
paper · doi:10.48550/arxiv.2510.26072
The influence of positive Q-value four-neutron transfer (PQ4NT) effects on the sub-barrier capture cross sections is systematically investigated using the empirical barrier distribution (EBD2) method. For 13 fusion reactions with Q4n>0, sustained neutron-pair transfer is found to reduce barrier heights and enhance capture cross sections at sub-barrier energies. In contrast, reactions such as 18O+58Ni, which have Q2n>0 but Q4n<0, exhibit no enhancement due to the stalling of subsequent neutron-pair transfer after the initial 2n transfer. By incorporating PQ4NT effects into EBD2 for systems with Q4n>0, the average deviation between predicted and experimental capture cross sections (113 datasets) is significantly reduced by 22%. Additionally, time-dependent Hatree-Fock (TDHF) calculations confirm greater barrier reduction in 40Ca-induced reactions (Q4n>0) compared to those induced by 48Ca.