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arXiv 1104.0103nucl-th
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中能重离子碰撞中的碰撞效应

Initialization effect in heavy-ion collisions at intermediate energies

Gao-Chan Yong, Yuan Gao, Wei Zuo, Xun-Chao Zhang

摘要:

基于同位旋相关的Boltzmann-Uehling-Uhlenbeck输运模型和Skyrme力参数,研究了中能重离子碰撞中的初始化效应.我们发现,在自由中子质子比(n/p)、π-/π +比以及中子质子差流(F^x_n-p)等观测量中,存在中等的初始化效应。初始化的影响是更大的带电π-/π比n/p比。初始化效应在较低入射能量的核反应中更为明显。对于光反应系统或大型非对称(中子富集)反应系统,我们没有看到初始化的大影响。我们还看到相对较大的影响,初始化的中子质子差流在相对较低的入射束能量或大的碰撞参量。这些结果对精细研究非对称核物质的物态方程有一定的参考价值。

英文摘要:

Based on the isospin-dependent Boltzmann-Uehling-Uhlenbeck transport model plus the Skyrme force parameters, initialization effect is studied in heavy-ion collision at intermediate energies. We find that there are moderate initialization effects in the observables of free neutron to proton ratio (n/p), pion-/pion + ratio, as well as neutron to proton differential flow (F^x_n-p). Effects of initialization are larger for charged pion-/pion ratios than n/p ratios. And the effects of initialization are more evident in nuclear reactions at lower incident beam energies. We do not see large effects of initialization for light reaction systems or large asymmetric (neutron-richer) reaction systems. We also see relatively large effects of initialization on the neutron to proton differential flow at relatively lower incident beam energies or with large impact parameters. These results may be useful for the delicate studies of Equation of Sate (EoS) of asymmetric nuclear matter.

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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