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arXiv 0902.4601hep-phnucl-exnucl-th
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FAIR能量下的状态方程和共振的作用

Equation of state at FAIR energies and the role of resonances

E. Zabrodin, I. C. Arsene, J. Bleibel, M. Bleicher, L. V. Bravina, G. Burau, Amand Faessler, C. Fuchs, M. S. Nilsson, K. Tywoniuk, H. Stoecker

摘要:

利用UrQMD和QGSM两种微观模型,计算了能量为11.6 ~ 160 AGeV的重离子碰撞中局域平衡核物质的有效状态方程.对体积为V = 125 fm**3的固定中心立方胞和遵循具有均匀分布能量的中心区域的生长的膨胀胞进行分析。对于所有的反应,在两个模型中,经过一定的弛豫时间后,接近局部平衡状态。状态方程具有简单的线性关系P/e = c_s**2,其中0.12 < c_s**2 < 0.145。重共振是导致c_s**2(T)和c_s**2(mu_B)偏离线性行为的原因。在T-mu_B和T-mu_S平面上,状态方程也几乎呈线性关系,并表现出与系统的非弹性冻结有关而不是与解除禁闭相变有关的扭结。

英文摘要:

Two microscopic models, UrQMD and QGSM, are used to extract the effective equation of state (EOS) of locally equilibrated nuclear matter produced in heavy-ion collisions at energies from 11.6 AGeV to 160 AGeV. Analysis is performed for the fixed central cubic cell of volume V = 125 fm**3 and for the expanding cell that followed the growth of the central area with uniformly distributed energy. For all reactions the state of local equilibrium is nearly approached in both models after a certain relaxation period. The EOS has a simple linear dependence P/e = c_s**2 with 0.12 < c_s**2 < 0.145. Heavy resonances are shown to be responsible for deviations of the c_s**2(T) and c_s**2(mu_B) from linear behavior. In the T-mu_B and T-mu_S planes the EOS has also almost linear dependence and demonstrates kinks related not to the deconfinement phase transition but to inelastic freeze-out in the system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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