The Role of Potential Structure in Excitation Functions of Synthesizing Superheavy Nuclei

The excitation functions of two very similar reaction channels,⁵⁸Fe+²⁰⁸Pb→ ²⁶⁵Hs+1n and⁵⁸Fe+²⁰⁹Bi→ ²⁶⁶Mt+1n are studied in the framework of the dinuclear system conception. The fusion probabilities arefound to be strongly subject to the structure of the driving potential. Usually the fusion probability is hindered by a barrier from the injection channel towards the compound nuclear configuration. The barrier towards the mass symmetrical direction,however, also plays an important role for the fusion probability, because the barrier hinders the quasi-fission, and therefore helps fusion.