Cold multinucleon transfer and formation of a dinuclear complex

Using a kinematical coincidence setup with ΔE-E identification two-body reactions between medium heavy nuclei were studied in the vicinity of the Coulomb barrier. The measured angular distributions for transfer of up to four protons with additional transfer of neutrons show maxima at large c.m. angles of 120--140 degree. For one- and partially for two-proton transfers the angular distributions are consistent with a one-step transfer mechanism, described by a distorted-wave Born approximation (DWBA) approach. The angular distributions of the three- and four-proton transfers show components in the forward angular region which cannot be described by DWBA. These contributions are interpreted as originating from the decay of a dinuclear complex; for this complex a lifetime of r=6-2+6x10-22 s is deduced from the angle of rotation