Subbarrier heavy ion fusion enhanced by nucleon transfer

摘要

We discuss a model for the description of subbarrier fusion of heavy ions which takes into account the coupling to the low-energy surface vibrational states and to the few-nucleon transfer with arbitrary reaction Q-value. The fusion reactions ~(28,30)Si + ~(58,62,64)Ni, ~(40)Ca + ~(90,96)Zr, ~(28)S + ~(94,100)Mo, ~(58)Ni + ~(64)Ni, ~(16,18,20,22,24)O + ~(58)Ni and ~(28)Si + ~(124,126,128,130,132)Sn are analyzed in detail. The model describes rather well the experimental fusion cross section and mean angular momentum for reactions between nuclei near the β-stability line. It is shown that these quantities are significantly enhanced by few-nucleon transfer with large positive Q-value. A shape independent parameterization of the heavy ion potential at distances smaller then the touching point is proposed.