System dependence of one- and two-nucleon transfer reactions induced by medium weight projectiles

Few nucleon transfer reactions have been measured for the systems 64Ni + 208Pb and 80Se + 208Pb at energies slightly above the Coulomb barrier. Together with previous data induced by lighter ions heavy ion induced transfer reactions on 208Pb have now been studied with projectiles in the mass range A=12-86. The experimental total reaction cross sections and the yields for quasi-elastic processes are compared with various theoretical predictions. For the one- and two-nucleon transfer reactions a systematic behavior of the energy- and angle-integrated cross sections is observed. This behavior can be understood within a simple semi-classical model. A comparison of the cross section ratios between one- and two-neutron and the one- and the two-proton transfer reactions indicates that the two-proton-transfer process might show an enhancement with respect to the one-proton transfer reaction