The influence of transfer reactions on the sub-barrier fusion enhancement in the systems 58.64Ni +, 92,100Mo

High resolution experiments performed during the past few years demonstrated that the various reaction modes occurring in heavy ion collisions can strongly influence each other. This interrelation of the different reaction modes brings a nuclear structure dependence to the fusion and deep-inelastic channels that were previously described in the framework of pure statistical models. In order to fully understand the interrelation between these reaction channels, a complete set of measurements including elastic and inelastic scattering, few-nucleon transfer and fusion is required. In continuation of our earlier measurements of the fusion cross sections in the system 58,64Ni + 92,100Mo we finished the studies of the quasielastic process in these systems. The experiments were done in inverse reaction kinematics using the split-pole spectrograph with its hybrid focal-plane detector for particle identification. The experiments with 100Mo beams were performed previously. First test runs with 92Mo showed the possible interference with 98Mo ions which could be eliminated by using the 13+ charge state from the ECR source. The data from these experiments were completely analyzed. The smallest transfer cross sections are observed for the systems 64Ni + 100Mo and 58Ni + 92Mo, i.e., the most neutron-rich and neutron-deficient systems, respectively. For the other systems, 64Ni + 92Mo and 58Ni + 100Mo, the transfer cross sections at energies close to the barrier are about of equal magnitude. This observation does not correlate with the deviation of the experimental fusion cross sections from the coupled-channels predictions. While for 58Ni + 100Mo discrepancies between the experimental and theoretical fusion cross sections are observed, the system 64Ni + 92Mo which shows about the same transfer yields, is quite well described by the coupled-channels calculations