Neutron transfer reactions at large distances

⁵⁸induced one- and two-neutron transfer reactions have been measured on ²³²Th at Elab=500 MeV. The transfer probabilities at large internuclear distances measured for the deformed ²³²Th target are compared with similar data on spherical ²⁰⁸Pb. For one-neutron transfer reactions good agreement between experiment and the prediction from the tunneling model is observed in both cases. The transfer probabilities for two-neutron transfer reactions deviate from the semiclassical predictions. The disagreement increases at higher bombarding energies. These deviations can be explained by the influence of diffractive effects which become more important at higher bombarding energies.