Waqas Muhammad, Peng Guang-Xiong
School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China.
Theoretical Physics Center for Science Facilities, Institute of High Energy Physics, Beijing 100049, China.
Entropy (Basel). 2021 Apr 20;23(4):488. doi: 10.3390/e23040488.
Transverse momentum spectra of π+, , Λ, Ξ or Ξ¯+, Ω or Ω¯+ and deuteron () in different centrality intervals in nucleus-nucleus collisions at the center of mass energy are analyzed by the blast wave model with Boltzmann Gibbs statistics. We extracted the kinetic freezeout temperature, transverse flow velocity and kinetic freezeout volume from the transverse momentum spectra of the particles. It is observed that the non-strange and strange (multi-strange) particles freezeout separately due to different reaction cross-sections. While the freezeout volume and transverse flow velocity are mass dependent, they decrease with the resting mass of the particles. The present work reveals the scenario of a double kinetic freezeout in nucleus-nucleus collisions. Furthermore, the kinetic freezeout temperature and freezeout volume are larger in central collisions than peripheral collisions. However, the transverse flow velocity remains almost unchanged from central to peripheral collisions.
利用具有玻尔兹曼-吉布斯统计的激波模型，分析了质心能量下核-核碰撞中不同中心度区间内π⁺、 、Λ、Ξ或Ξ⁺、Ω或Ω⁻以及氘核（）的横向动量谱。我们从粒子的横向动量谱中提取了动力学冻结温度、横向流速度和动力学冻结体积。观察到，由于不同的反应截面，非奇异粒子和奇异（多奇异）粒子分别冻结。虽然冻结体积和横向流速度与质量有关，但它们随着粒子静止质量的增加而减小。本工作揭示了核-核碰撞中的双动力学冻结情景。此外，中心碰撞中的动力学冻结温度和冻结体积比周边碰撞中的更大。然而，从中心碰撞到周边碰撞，横向流速度几乎保持不变。
