论文标题
平均场动力学对核一体耗散中空间分布的敏感性
Sensitivity of the Mean Field Dynamics to the Spatial Distribution in Nuclear One-body Dissipations
论文作者
论文摘要
从静态激发有限原子核开始，我们使用量子分子动力学模型（QMD）模拟了核子的动力传播，而无需碰撞项，并计算了最大的Lyapunov指数（LLE）。非线性平均场动力学对初始条件的敏感性，尤其是在某些热力学稳定条件下核子的初始空间分布，已通过计算事件空间中定义的LLE来确认。相比之下，相位空间中定义的类似Lyapunov的指数更清楚地表示非线性动力学对中间能核反应时间内初始条件的机械稳定性的敏感性。这些结论不仅有助于我们更深入地了解中等能量的核反应动力学机制，而且还有益于进一步阐明重型离子碰撞中确定性混乱的具体性能。
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.
