论文标题
核冲突中量子平衡，耗散和波动的时间尺度
Timescales of quantum equilibration, dissipation and fluctuation in nuclear collisions
论文作者
论文摘要
了解量子系统中平衡过程的动力学以及它们与耗散和波动的相互作用是量子多体理论的主要挑战。使用完全显微镜方法研究了原子核的碰撞中，研究了此类过程的时间尺度。在广泛的能量范围内，比较了时间依赖性的Hartree-fock（TDHF）和时间依赖性的随机相近似（TDRPA）计算结果。发现全质量平衡的时间尺度（$ \ sim2 \ times10^{ - 20} $ s）比中子到蛋白质平衡，动能和角动量耗散的时间尺度大得多，这些平衡量为$ 10^{ - 21} $ s。片段中质量数的波动以及其中子和质子数量之间的相关性仅在几美元$ 10^{-21} $ s之内。这表明耗散基本上不受质量平衡的影响，而是主要由片段之间的核子交换驱动。
Understanding the dynamics of equilibration processes in quantum systems as well as their interplay with dissipation and fluctuation is a major challenge in quantum many-body theory. The timescales of such processes are investigated in collisions of atomic nuclei using fully microscopic approaches. Results from time-dependent Hartree-Fock (TDHF) and time-dependent random-phase approximation (TDRPA) calculations are compared for 13 systems over a broad range of energies. The timescale for full mass equilibration ($\sim2\times10^{-20}$s) is found to be much larger than timescales for neutron-to-proton equilibration, kinetic energy and angular momentum dissipations which are on the order of $10^{-21}$s. Fluctuations of mass numbers in the fragments and correlations between their neutron and proton numbers build up within only a few $10^{-21}$s. This indicates that dissipation is basically not impacted by mass equilibration, but is mostly driven by the exchange of nucleons between the fragments.
