Elimination of fast variables and initial slip: a new mechanism to the fusion hindrance in heavy-ion collisions

Abstract : Synthesis of superheavy elements by fusion-evaporation reactions is limited by the extremely low cross-sections. One of the reasons of the reduced cross-sections is the so-called quasifission that hinders fusion for reactions with heavy systems. It is well acknowledged that fusion hindrance is due to a conditional saddle that has to be overcome in a dissipative environment to reach the compound configuration from the contact point. However, the dynamical description is not yet well established. In this communication we show that elimination of fast variables to reduce the number of degrees of freedom leads to a slip of the initial conditions of the slow variables which has a significant impact on the amplitude of the hindrance phenomenon. The energy dependence of the slip is similar to phenomenological shift introduced in the "fusion by diffusion" model.
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David Boilley, Yasuhisa Abe, Bartholomé Cauchois, Caiwan Shen. Elimination of fast variables and initial slip: a new mechanism to the fusion hindrance in heavy-ion collisions. Journal of Physics G: Nuclear and Particle Physics, IOP Publishing, 2019, 46 (11), pp.115102. ⟨10.1088/1361-6471/ab11ef⟩. ⟨in2p3-02073559⟩

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