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arXiv 0709.1244nucl-th
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中能重离子碰撞中各向异性流和核物质状态方程的标度

Scaling of Anisotropic Flows and Nuclear Equation of State in Intermediate Energy Heavy Ion Collisions

T. Z. Yan, Y. G. Ma, X. Z. Cai, D. Q. Fang, W. Guo, C. W. Ma, W. Q. Shen, W. D. Tian, K. Wang

摘要:

利用量子分子动力学模型,采用不同的势参数,对25 MeV/核子的轻团簇$^{86}$ Kr + $^{124}$ Sn在大碰撞参数下的椭圆流($v_2$)和六极流($v_4$)进行了详细的研究.使用了四个参数集,包括带/不带对称能量项的软或硬状态方程(EOS)。在上述计算条件下,证明了轻团簇的椭圆流与横动量($p_t$)的核子数($A$)标度和$v_4/A^{2}$与$(p_t/A)^2$的标度。对所有轻碎片,$v_4/{v_2}^2$的比值保持1/2的常数,与$p_t$无关。通过比较不同的物态方程和对称势项的组合,结果表明,上述标度行为是稳定的,不依赖于势的细节,而流动的强度对物态方程和对称势项是敏感的。

英文摘要:

Elliptic flow ($v_2$) and hexadecupole flow ($v_4$) of light clusters have been studied in details for 25 MeV/nucleon $^{86}$Kr + $^{124}$Sn at large impact parameters by Quantum Molecular Dynamics model with different potential parameters. Four parameter sets which include soft or hard equation of state (EOS) with/without symmetry energy term are used. Both number-of-nucleon ($A$) scaling of the elliptic flow versus transverse momentum ($p_t$) and the scaling of $v_4/A^{2}$ versus $(p_t/A)^2$ have been demonstrated for the light clusters in all above calculation conditions. It was also found that the ratio of $v_4/{v_2}^2$ keeps a constant of 1/2 which is independent of $p_t$ for all the light fragments. By comparisons among different combinations of EOS and symmetry potential term, the results show that the above scaling behaviors are solid which do not depend the details of potential, while the strength of flows is sensitive to EOS and symmetry potential term.

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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