arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.10829nucl-th
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核单体耗散中平均场动力学对空间分布的敏感性

Sensitivity of the Mean Field Dynamics to the Spatial Distribution in Nuclear One-body Dissipations

Yong-Zhong Xing, Wei-Cheng Fu, Xiao-Bin Liu, Fei-Ping Lu, Hong-Fei Zhang, Yu-Ming Zheng

摘要:

本文从静态激发的有限原子核出发,用不考虑碰撞项的量子分子动力学模型(QMD)模拟了核子的动力学传播,并计算了最大李雅普诺夫指数(LLE)。通过计算事件空间中定义的LLE,数值上证实了非线性平均场动力学对初始条件的敏感性,特别是在一定的热力学稳定条件下对核子初始空间分布的敏感性。相空间中定义的类Lyapunov指数更清楚地反映了中能核反应时间内非线性动力学对初始条件力学稳定性的敏感性。这些结论不仅有助于我们更深入地理解中能核反应动力学机制,而且有助于进一步阐明重离子碰撞中确定性混沌的具体表现。

英文摘要:

Started from the static excited finite atomic nucleus, we have simulated the dynamical propagation of the nucleons using Quantum Molecular Dynamics model (QMD) without the collision term and calculated the Largest Lyapunov Exponent (LLE). The sensitivity of the nonlinear mean field dynamics to the initial conditions, in particular to the initial spatial distribution of the nucleons in certain thermodynamical stable condition, has been confirmed numerically by calculating the LLE defined in the event space. Comparatively, the Lyapunov-like exponent defined in phase space represents more clearly the sensitivity of the nonlinear dynamics to the mechanical stability of the initial conditions within the nuclear reaction time at intermediate energies. These conclusions are not only helpful for us to understand more deeply the mechanism of the nuclear reaction dynamics at intermediate energies, but it is also beneficial for clarifying further the concrete performances of deterministic chaos in the heavy-ion collisions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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