核碰撞早期颈部形成动力学估计核粘度

IF 1.5 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Modern Physics Letters A Pub Date : 2023-10-12 DOI:10.1142/s0217732323501365

Amano, S., Aritomo, Y., Ohta, M.

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引用次数: 0

摘要

研究了两核合并的最早期阶段，并用它来估计核粘度。用统一朗之万方程方法模拟了重离子碰撞从接近阶段到聚变-裂变阶段的颈部区域的时间演化。研究发现，在核-核碰撞的模拟中，也可以看到宏观液滴颈部生长中出现的从粘性到惯性聚结的转变。用流体力学公式分析了核颈生长的动力学，用宏观液滴的类比估计了核物质的黏度系数。

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Nuclear viscosity estimated by dynamics of neck formation in the early stage of nuclear collision

The very early stage of the coalescence of two nuclei is studied and used to estimate the nuclear viscosity. The time evolution of the neck region has been simulated by the unified Langevin equation method, which is used in the analysis of heavy-ion collisions from the approaching stage to the fusion-fission stage. It is found that the transition from viscous to inertial coalescence that appeared in the neck growth of macroscopic drops can also be seen in the present simulation in nucleus–nucleus collisions. The dynamics of neck growth is analyzed in terms of the hydrodynamical formula and the viscosity coefficient of nuclear matter is estimated using the analogy of macroscopic drops.

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来源期刊

Modern Physics Letters A 物理-物理：核物理

CiteScore

3.10

自引率

7.10%

发文量

186

审稿时长

3 months

期刊介绍： This letters journal, launched in 1986, consists of research papers covering current research developments in Gravitation, Cosmology, Astrophysics, Nuclear Physics, Particles and Fields, Accelerator physics, and Quantum Information. A Brief Review section has also been initiated with the purpose of publishing short reports on the latest experimental findings and urgent new theoretical developments.