Dissipative dynamics in quasifission

Quasifission is the primary reaction mechanism that prevents the formation of superheavy elements in heavy-ion fusion experiments. Employing the time-dependent density functional theory approach, we study quasifission in the systems Ca-40,Ca-48+U-238. Results show that for Ca-48 projectiles the quasifission is substantially reduced in comparison to the Ca-40 case. This partly explains the success of superheavy element formation with Ca-48 beams. For the first time, we also calculate the repartition of excitation energies of the two fragments in a dynamic microscopic theory. The differences between both systems are interpreted in terms of initial neutron to proton asymmetry of the colliding partners.