K. Hagino

Heavy-ion fusion reactions around the Coulomb barrier

Heavy-ion fusion reactions at energies near and below the Coulomb barrier have provided an interesting tool to investigate nuclear structure. At these energies, the fusion reaction takes place by quantum tunneling, and the effect of the coupling of the relative motion between the colliding nuclei to collective excitations is significantly amplified. This results in the subbarrier enhancement of fusion cross sections as compared to the fusion cross sections in the absence of the coupling.
In this lecture, I will discuss how one can study the coupling effect using the so called barrier distribution technique, that is based on the coupled-channels approach to heavy-ion reactions. I will also cover a few recent topics in the field, that include: fusion reaction induced by neutron-rich nuclei, quasi-elastic barrier distributions, the fusion potential anomaly, and fusion reactions of massive systems.