Multi-neutron and proton transfer reactions in deep inelastic heavy-ion collisions

We discuss the characteristics of multi-nucleon transfer reactions in deep-inelastic heavy-ion collisions. We calculate the number of transferred neutrons and protons based on a macroscopic approach using a Fokker-Planck equation, and compare with experimental data. We show that our macroscopic approach well reproduces the experimental data concerning the ratio of the mass to the proton numbers in the projectile-like fragment as a function of the energy loss from the relative motion. Our calculations, however, do not reproduce the recent data, where the transferred number of neutrons and protons are measured separately. The net flow of nucleons evolve even in opposite directions in the experimental data and in our transport theory.