Dynamical explanation for the anomaly in the diffuseness parameter of the nucleus-nucleus potential in heavy-ion fusion reactions

作者：Zanganeh, V.^*; Gharaei, R.; Wang, N.

来源：PHYSICAL REVIEW C, 2017, 95(3): 034620.

DOI：10.1103/PhysRevC.95.034620

• CROSS-SECTIONS
• SURFACE DIFFUSENESS
• SUBBARRIER FUSION
• BARRIER
• DEPENDENCE
• SCATTERING
• COUPLINGS
• ENERGIES

The abnormally large diffuseness parameter of the Woods-Saxon (WS) potential in heavy-ion fusion reactions is explained for the first time based on the microscopic dynamics simulations. With the improved quantum molecular dynamic (ImQMD) model, we systematically explore the dynamical processes in the fusion reactions C-12 + Zr-92, O-16 + Zr-92, Si-28 + Zr-92, Cl-35 + Zr-92, Ca-40 + Ti-46, and O-16 + Sm-154. Without introducing any free model parameters or additional assumptions, the microscopic ImQMD model can reproduce the measured fusion cross sections of all selected colliding systems with good accuracy. Due to the dynamical evolutions of the density distributions in the fusion processes, the energy dependence of nucleus-nucleus potential can be clearly observed. Based on the dynamical nucleus-nucleus potential of the ImQMD simulations, we extract the corresponding diffuseness parameters of the WS potential. The obtained values locate in a range between a = 0.83 and 1.17 fm at different incident energies. In addition, the regular decreasing trend for the diffuseness parameter with the increase of the incident energies is also observed.

• 出版日期2017-3-31
• 单位广西师范大学