Examining the role of transfer in sub-barrier fusion enhancement. ^35,37Cl + ¹³⁰Te systems

It is well established that the fusion excitation functions of heavy-ion induced reactions are significantly enhanced as compared to the one-dimensional barrier penetration model (1-d BPM) in the sub-barrier energies. To investigate the influential factors in sub-barrier fusion enhancement, the excitation functions of ^35,37Cl + ¹³⁰Te systems have been measured at energies 10% below to 15% above the barrier, and analysed in the framework of coupled-channels (CC) calculations. It has been found that the couplings of in-elastic excitations well reproduces the EF of ^35,37Cl + ¹³⁰Te system, but underpredicts for ³⁵Cl + ¹³⁰Te system at sub-barrier energies. To explore this notch, the couplings of positive Q-value neutron transfer channels have been included in the CC calculations. It has been observed that the inclusion of +2n transfer channel coupling explains the sub-barrier fusion cross-sections of ³⁵Cl + ¹³⁰Te system, indicating the role of transfer in sub-barrier fusion enhancement. (author)