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arXiv 1405.5271nucl-th
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丰中子核诱发重离子聚变反应的微观动力学模拟

Microscopic dynamics simulations of heavy-ion fusion reactions induced by neutron-rich nuclei

Ning Wang, Li Ou, Yingxun Zhang, Zhuxia Li

摘要:

用改进的量子分子动力学(ImQMD)模型研究了丰中子核引起的重离子聚变反应。在考虑核的中子皮厚度和对称势的基础上,系统地研究了重离子聚变反应$^{16}$ O+ $^{76}$ Ge,$^{16}$ O + $^{154}$ Sm,$^{40}$ Ca+ $^{96}$ Zr和$^{132}$ Sn+ $^{40}$ Ca的核稳定性和聚变激发函数.用ImQMD模型可以很好地再现这些反应在库仑势垒附近的熔合截面。计算中采用的对称能的斜率参数为$L \approx 78$ MeV,表面能系数为$g_{\rm sur}=18\pm 1.5$ MeVfm $^2$ .此外,还发现表面对称项对丰中子聚变系统的聚变截面有显著的影响。对于亚势垒熔合,反应伴体密度的动力学涨落和颈侧表面扩散的增强导致熔合势垒的降低。

英文摘要:

The heavy-ion fusion reactions induced by neutron-rich nuclei are investigated with the improved quantum molecular dynamics (ImQMD) model. With a subtle consideration of the neutron skin thickness of nuclei and the symmetry potential, the stability of nuclei and the fusion excitation functions of heavy-ion fusion reactions $^{16}$O+$^{76}$Ge, $^{16}$O+$^{154}$Sm, $^{40}$Ca+$^{96}$Zr and $^{132}$Sn+$^{40}$Ca are systematically studied. The fusion cross sections of these reactions at energies around the Coulomb barrier can be well reproduced by using the ImQMD model. The corresponding slope parameter of the symmetry energy adopted in the calculations is $L \approx 78$ MeV and the surface energy coefficient is $g_{\rm sur}=18\pm 1.5$ MeVfm$^2$. In addition, it is found that the surface-symmetry term significantly influences the fusion cross sections of neutron-rich fusion systems. For sub-barrier fusion, the dynamical fluctuations in the densities of the reaction partners and the enhanced surface diffuseness at neck side result in the lowering of the fusion barrier.

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