Dynamics of massive systems and synthesis of superheavy elements

International audienceFor the synthesis of superheavy elements, it is indisensable to divide process into two steps : overcoming the Coulomb barrier and passing over the conditional saddle or the ridgeline. To facilitate the understanding of the mechanism which explains the fusion hindrance, we first emply an analytic model with an inverted parabola for the saddle. Then, results by realistic calculations are given for the cold fusion. Ambiguities of the model are also discussed for future investigations. Since the model is general, it is applied to incident channels with neutron-rich projectile and/or targets. These are necessary for synthesis of nuclides on so-called superheavy island around Z=114 and N=18