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arXiv 0704.0424nucl-ex
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能量为520 MeV/nucleon的U+U碰撞中的阻止效应

Stopping effects in U+U collisions with a beam energy of 520 MeV/nucleon

Xiao-Feng Luo, Xin Dong, Ming Shao, Ke-Jun Wu, Cheng Li, Hong-Fang Chen, Hu-Shan Xu

摘要:

采用相对论输运模型(ART 1.0),在束流动能为520 MeV/核子的条件下,模拟了U+U碰撞中的阻止效应。我们的模拟结果表明,两个极端取向的中心碰撞都可以实现完全停止,并且由于铀核的大变形,也可以形成一个体积足够大、持续时间足够长的热的、致密的核物质块体。在归一化碰撞参量$b/b_{max}<0.5$下,尖-尖碰撞中的核子侧向流比体-体碰撞中的大近3倍,体-体中心碰撞中的负椭圆流$v_{2}=-12%$最大,而尖-尖碰撞中的负椭圆流为零。因此,尖端-尖端碰撞和体-体碰撞中的极端环境和新的实验观测量分别为研究核EoS提供了良好的条件和灵敏的探针。将在中国兰州建造的冷却储存环(CSR)外靶装置(ETF)将提供高达520 MeV/核子的铀束流,预计将为探索核物质状态方程(EoS)做出重大贡献。

英文摘要:

A Relativistic Transport Model (ART1.0) is applied to simulate the stopping effects in tip-tip and body-body U+U collisions, at a beam kinetic energy of 520 MeV/nucleon. Our simulation results have demonstrated that both central collisions of the two extreme orientations can achieve full stopping, and also form a bulk of hot, dense nuclear matter with a sufficiently large volume and long duration, due to the largely deformed uranium nuclei. The nucleon sideward flow in the tip-tip collisions is nearly 3 times larger than that in body-body ones at normalized impact parameter $b/b_{max}<0.5$, and that the body-body central collisions have a largest negative nucleon elliptic flow $v_{2}=-12%$ in contrast to zero in tip-tip ones. Thus the extreme circumstance and the novel experimental observables in tip-tip and body-body collisions can provide a good condition and sensitive probe to study the nuclear EoS, respectively. The Cooling Storage Ring (CSR) External Target Facility (ETF) to be built at Lanzhou, China, delivering the uranium beam up to 520 MeV/nucleon is expected to make significant contribution to explore the nuclear equation of state (EoS).

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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