Comparison of heavy-ion transport simulations: Collision integral in a box
文献类型：期刊论文
| 作者 | Zhang, Ying-Xun1,2; Wang, Yong-Jia3; Colonna, Maria4; Danielewicz, Pawel5,6; Ono, Akira7; Tsang, Manyee Betty5,6; Wolter, Hermann8; Xu, Jun9; Chen, Lie-Wen10,11; Cozma, Dan12 |
| 刊名 | PHYSICAL REVIEW C
 |
| 出版日期 | 2018-03-30 |
| 卷号 | 97页码:034625 |
| ISSN号 | 2469-9985 |
| DOI | 10.1103/PhysRevC.97.034625 |
| 英文摘要 | Simulations by transport codes are indispensable to extract valuable physical information from heavy-ion collisions. In order to understand the origins of discrepancies among different widely used transport codes, we compare 15 such codes under controlled conditions of a system confined to a box with periodic boundary, initialized with Fermi-Dirac distributions at saturation density and temperatures of either 0 or 5 MeV. In such calculations, one is able to check separately the different ingredients of a transport code. In this second publication of the code evaluation project, we only consider the two-body collision term; i.e., we perform cascade calculations. When the Pauli blocking is artificially suppressed, the collision rates are found to be consistent for most codes (to within 1% or better) with analytical results, or completely controlled results of a basic cascade code. In order to reach that goal, it was necessary to eliminate correlations within the same pair of colliding particles that can be present depending on the adopted collision prescription. In calculations with active Pauli blocking, the blocking probability was found to deviate from the expected reference values. The reason is found in substantial phase-space fluctuations and smearing tied to numerical algorithms and model assumptions in the representation of phase space. This results in the reduction of the blocking probability in most transport codes, so that the simulated system gradually evolves away from the Fermi-Dirac toward a Boltzmann distribution. Since the numerical fluctuations are weaker in the Boltzmann-Uehling-Uhlenbeck codes, the Fermi-Dirac statistics is maintained there for a longer time than in the quantum molecular dynamics codes. As a result of this investigation, we are able to make judgements about the most effective strategies in transport simulations for determining the collision probabilities and the Pauli blocking. Investigation in a similar vein of other ingredients in transport calculations, like the mean-field propagation or the production of nucleon resonances and mesons, will be discussed in the future publications. |
| WOS关键词 | BOLTZMANN-LANGEVIN APPROACH ; QUANTUM MOLECULAR-DYNAMICS ; N-BODY APPROACH ; INTERMEDIATE ENERGIES ; MICROSCOPIC MODELS ; SYMMETRY ENERGY ; ISOSPIN PHYSICS ; EQUATION ; SYSTEMS ; STATE |
| 资助项目 | National Science Foundation of China[11475262] ; National Science Foundation of China[11365004] ; National Science Foundation of China[11375062] ; National Science Foundation of China[11505057] ; National Science Foundation of China[11747312] ; National Science Foundation of China[PHY-1403906] ; National Key Basic Research Development Program of China[2013CB834404] ; Zhejiang Provincial Natural Science Foundation of China[LY18A050002] ; European Unions Horizon research and innovation programme[654002] ; Japan Society for the Promotion of Science KAKENHI[24105008] ; Japan Society for the Promotion of Science KAKENHI[17K05432] ; Japan Society for the Promotion of Science KAKENHI[26790072] ; US National Science Foundation[PHY-1565546] ; CUSTIPEN (China-US Theory Institute for Physics with Exotic Nuclei) under the US Department of Energy[DE-FG02-13ER42025] ; Cluster of Excellence Origin and Structure of the Universe of the German Research Foundation (DFG) ; Major State Basic Research Development Program (973 Program) of China[2015CB856904] ; Major State Basic Research Development Program (973 Program) of China[2014CB845401] ; National Natural Science Foundation of China[11475243] ; National Natural Science Foundation of China[11421505] ; National Natural Science Foundation of China[11320101004] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000428777900004 |
| 出版者 | AMER PHYSICAL SOC |
| 资助机构 | National Science Foundation of China ; National Key Basic Research Development Program of China ; Zhejiang Provincial Natural Science Foundation of China ; European Unions Horizon research and innovation programme ; Japan Society for the Promotion of Science KAKENHI ; US National Science Foundation ; CUSTIPEN (China-US Theory Institute for Physics with Exotic Nuclei) under the US Department of Energy ; Cluster of Excellence Origin and Structure of the Universe of the German Research Foundation (DFG) ; Major State Basic Research Development Program (973 Program) of China ; National Natural Science Foundation of China |
| 源URL | [http://119.78.100.186/handle/113462/47608]  |
| 专题 | 中国科学院近代物理研究所 |
| 作者单位 | 1.China Inst Atom Energy, Beijing 102413, Peoples R China 2.Guangxi Key Lab Breeding Base Nucl Phys & Technol, Guilin 541004, Peoples R China 3.Huzhou Univ, Sch Sci, Huzhou 313000, Peoples R China 4.INFN LNS, Lab Nazl Sud, I-95123 Catania, Italy 5.Michigan State Univ, Nat Superconducting Cyclotron Lab, E Lansing, MI 48824 USA 6.Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA 7.Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan 8.Ludwig Maximilians Univ Munchen, Fac Phys, D-85748 Garching, Germany 9.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China 10.Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Ying-Xun,Wang, Yong-Jia,Colonna, Maria,et al. Comparison of heavy-ion transport simulations: Collision integral in a box[J]. PHYSICAL REVIEW C,2018,97:034625. |
| APA | Zhang, Ying-Xun.,Wang, Yong-Jia.,Colonna, Maria.,Danielewicz, Pawel.,Ono, Akira.,...&Zhang, Zhen.(2018).Comparison of heavy-ion transport simulations: Collision integral in a box.PHYSICAL REVIEW C,97,034625. |
| MLA | Zhang, Ying-Xun,et al."Comparison of heavy-ion transport simulations: Collision integral in a box".PHYSICAL REVIEW C 97(2018):034625. |
入库方式： OAI收割
来源：近代物理研究所
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