Abstract

Dynamics of the neck formation in the fusion of two heavy-ions is studied and its effect on the fusion probability is discussed. A multi-dimensional Langevin equation is used to study the fluctuation-dissipation dynamics of the fusion process. It is found that the rapid formation of the neck is due to the smallness of the mass for this motion. Importance of the independent treatment of the neck degree of freedom is stressed. By comparing the results with and without taking account of the neck degree of freedom, it is found that the fusion probability is decreased significantly by the rapid neck formation for the systems that show the phenomenon of the fusion hindrance.

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