Near-Barrier Fusion of Sn + Ni and Te + Ni Systems: Examining the Correlation between Nucleon Transfer and Fusion Enhancement

摘要

The fusion excitation functions for radioactive ~(132)Sn + ~(58)Ni and stable ~(130)Te + ~(58,64)Ni were measured at energies near the Coulomb barrier. The coupling of transfer channels in heavy-ion fusion was examined through a comparison of Sn + Ni and Te + Ni systems, which have large variations in the number of positive Q-value nucleon transfer channels. In contrast with previous experimental comparisons, where increased sub-barrier fusion cross sections were observed in systems with positive Q-value neutron transfer channels, the reduced excitation functions were equivalent for the different Sn + Ni and Te + Ni systems. The present results suggest a dramatically different influence of positive Q-value transfer channels on the fusion process for the Sn + Ni and Te + Ni systems.