Subbarrier heavy ion fusion enhanced by nucleon transfer

Abstract:

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 ^28,30Si+^58,62,64Ni, ⁴⁰Ca+^90,96Zr, ²⁸S+^94,100Mo, ⁵⁸Ni+⁶⁴Ni, ^{16,18,20,22,24}O+⁵⁸Ni and ²⁸Si+^{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.