Determination of the nuclear incompressibility from the rapidity-dependent elliptic flow in heavy-ion collisions at beam energies 0.4A-1.0A GeV
Determination of the nuclear incompressibility from the rapidity-dependent elliptic flow in heavy-ion collisions at beam energies 0.4A-1.0A GeV
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束流能量 0.4A-1.0A GeV 下重离子碰撞中依赖于速度的椭圆流确定核不可压缩性
DOI：
10.1016/j.physletb.2018.01.035
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发表时间：
2018-03
影响因子：
4.4
通讯作者：
Trautmann Wolfgang
中科院分区：
文献类型：
--
作者：
Wang Yongjia;Guo Chenchen;Li Qingfeng;Le Fevre Arnaud;Leifels Yvonne;Trautmann Wolfgang
背景资料：核不可压缩性（K 0）在理解核结构、核反应以及天体物理中的各种现象中起着至关重要的作用。重离子碰撞测量结合输运模型模拟作为提取核不可压缩性的重要工具。然而，在运输模型（或模型依赖性）的不确定性部分影响提取结果的可靠性。目的：在本工作中，通过使用最近的测量数据的快速相关的流动，我们约束的不可压缩性的核物质，并分析模型的不确定性对所获得的值的影响。方法：该方法是基于新更新的版本的超相对论量子分子动力学（UrQMD）模型中的Skyrme势能密度泛函的介绍。采用了三种不同的Skyrme相互作用，它们给出了从K 0= 201到271 MeV的不同的不可压缩性。通过比较UrQMD模型模拟和FOPI数据，得到了束流能量为0.4A-1.0A GeV的Au+ Au碰撞中速度依赖的椭圆流的不可压缩性。结果：椭圆流v2作为快度y 0的函数，可以用二次拟合v2 = v20 + v22 y 02来描述。发现由v2 n= v2 n定义的量v2 n| v 20| +| v 22|对不可压缩性K 0和介质中核子-核子碰撞截面十分敏感，而对核对称能的斜率参数L不敏感。结论：用FU 3FP 4参数化介质中核子-核子碰撞截面，从自由质子和氘的v2 n中提取出平均K 0= 220±40 MeV.然而，剩余的系统不确定性，部分与介质中核子-核子截面的选择有关，具有相同的量级（±40 MeV）。总的来说，依赖于快度的椭圆流支持一个软物质状态方程。
Background: The nuclear incompressibility (K 0) plays a crucial role in understanding diverse phenomena in nuclear structure and reactions, as well as in astrophysics. Heavy-ion-collision measurements in combination with transport model simulations serve as important tools for extracting the nuclear incompressibility. However, uncertainties in transport models (or model dependence) partly affect the reliability of the extracted result. Purpose: In the present work, by using the recently measured data of rapidity-dependent flows, we constrain the incompressibility of nuclear matter and analyze the impact of model uncertainties on the obtained value. Method: The method is based on the newly updated version of the ultrarelativistic quantum molecular dynamics (UrQMD) model in which the Skyrme potential energy-density functional is introduced. Three different Skyrme interactions which give different incompressibilities varying from K 0= 201 to 271 MeV are adopted. The incompressibility is deduced from the comparison of the UrQMD model simulations and the FOPI data for rapidity-dependent elliptic flow in Au+ Au collisions at beam energies 0.4A–1.0A GeV. Results: The elliptic flow v 2 as a function of rapidity y 0 can be well described by a quadratic fit v 2= v 20+ v 22⋅ y 0 2. It is found that the quantity v 2 n defined by v 2 n=| v 20|+| v 22| is quite sensitive to the incompressibility K 0 and the in-medium nucleon–nucleon cross section, but not sensitive to the slope parameter L of the nuclear symmetry energy. Conclusions: With the FU3FP4 parametrization of the in-medium nucleon–nucleon cross section, an averaged K 0= 220±40 MeV is extracted from the v 2 n of free protons and deuterons. However, remaining systematic uncertainties, partly related to the choice of in-medium nucleon–nucleon cross sections, are of the same magnitude (±40 MeV). Overall, the rapidity dependent elliptic flow supports a soft symmetric-matter equation-of-state.
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影响因子：
3.1
作者：
Y. Zhang;Zhu-xia Li
通讯作者：
Y. Zhang;Zhu-xia Li
影响因子：
8.6
作者：
Kruse;Jacak;Stöcker
通讯作者：
Kruse;Jacak;Stöcker
影响因子：
3.1
作者：
Bao-An Li;Lie-Wen Chen
通讯作者：
Bao-An Li;Lie-Wen Chen
DOI：
10.1146/annurev.ns.40.120190.000553
发表时间：
1990
影响因子：
12.4
作者：
H. Nifenecker;J. Pinston
通讯作者：
H. Nifenecker;J. Pinston
影响因子：
8.6
作者：
Yu-Ming Zheng;C. Ko;Bao-An Li;Binghamton University;A. University
通讯作者：
Yu-Ming Zheng;C. Ko;Bao-An Li;Binghamton University;A. University