Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2007-04-21
Phys.Rev.C75:057603,2007
Physics
Nuclear Physics
Nuclear Theory
4 pages, 3 figures
Scientific paper
10.1103/PhysRevC.75.057603
Based on the adiabatic picture for heavy-ion reactions, in which the neck formation in the one-body system is taken into account, we propose a two-step model for fusion cross sections at deep subbarrier energies. This model consists of the capture process in the two-body potential pocket, which is followed by the penetration of the adiabatic one-body potential to reach a compound state after the touching configuration. We describe the former process with the coupled-channels framework, while the latter with the WKB approximation by taking into account the coordinate dependent inertia mass. The effect of the one-body barrier is important at incident energies below the potential energy at the touching configuration. We show that this model well accounts for the steep fall-off phenomenon of fusion cross sections at deep subbarrier energies for the $^{64}$Ni+$^{64}$Ni and $^{58}$Ni+$^{58}$Ni reactions.
Hagino Kouichi
Ichikawa Takatoshi
Iwamoto Akira
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