One-body Langevin dynamics in heavy-ion collisions at intermediate energies
One-body Langevin dynamics in heavy-ion collisions at intermediate energies
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DOI：
10.1103/physrevc.99.024612
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发表时间：
2018-07
影响因子：
3.1
通讯作者：
Hao Lin;P. Danielewicz
中科院分区：
文献类型：
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作者：
Hao Lin;P. Danielewicz
本文提出了一个新的框架来处理重离子碰撞中核子-核子散射的耗散和涨落动力学。两体碰撞过程可用核子在粘性核介质中的扩散来描述，并由动量空间中的朗之万方程组控制。新的框架结合通常的平均场动力学可以用来模拟中能重离子碰撞。作为原理的证明，我们模拟了Au + Au反应，并在相同的约束条件下获得与其他现有代码一致的结果。我们还研究了在Sn + Sn反应在50 MeV/核子的碎片的形成，结果进行了讨论，并与其他两种常用的碰撞模型进行了比较。
We present a new framework to treat the dissipation and fluctuation dynamics associated with nucleon-nucleon scattering in heavy-ion collisions. The two-body collision processes are effectively described in terms of the diffusion of nucleons in viscous nuclear media, governed by a set of Langevin equations in momentum space. The new framework combined with the usual mean field dynamics can be used to simulate heavy-ion collisions at intermediate energies. As a proof of principle, we simulate Au + Au reactions and obtain results consistent with other existing codes under the same constrained conditions. We also study the formation of fragments in Sn + Sn reactions at 50 MeV/nucleon, and results are discussed and compared with two other models commonly employed for collisions.