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arXiv 1003.1356nucl-th
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短程动力学核-核势

Dynamical nucleus-nucleus potential at short distances

Yongying Jiang, Ning Wang, Zhuxia Li, Werner Scheid

摘要:

采用改进的量子分子动力学(ImQMD)模型和扩展的核动能近似,研究了40 Ca +40 Ca,48 Ca +208 Pb和126 Sn +130 Te聚变反应的核-核动力学势.得到的40 Ca +40 Ca的熔合势垒与从测量的熔合激发函数中提取的熔合势垒符合得很好,熔合袋的深度与含时Hartree-Fock计算的结果接近。还研究了熔合势垒的能量依赖性。对于重熔合系统,熔合袋变浅,对称系统几乎消失,在短距离处得到的势高于绝热势。

英文摘要:

The dynamical nucleus-nucleus potentials for fusion reactions 40Ca+40Ca, 48Ca+208Pb and 126Sn+130Te are studied with the improved quantum molecular dynamics (ImQMD) model together with the extended Thomas-Fermi approximation for the kinetic energies of nuclei. The obtained fusion barrier for 40Ca+40Ca is in good agreement with the extracted fusion barrier from the measured fusion excitation function, and the depth of the fusion pockets are close to the results of time-dependent Hartree-Fock calculations. The energy dependence of fusion barrier is also investigated. For heavy fusion system, the fusion pocket becomes shallow and almost disappears for symmetric systems and the obtained potential at short distances is higher than the adiabatic potential.

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