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Influence of alpha-clustering configurations in O-16 + Au-197 collisions at Fermi energy

机译：o-16 + Au-197在费米能量碰撞中的alpha聚类配置的影响

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摘要

The alpha-clustering configurations in light nuclei have attracted a great deal of attention over past years. Nuclear reactions serve as one possible way to study this topic. The aim of this paper was to discuss whether or not heavy-ion collisions at Fermi energy could be a good tool to investigate the cluster configurations in light nuclei. In particular, (16) O + Au-197 collisions are simulated using a transport model to check if any observable change is sensitive to the cluster configurations. Within an extended quantum molecular dynamics model, two different a-clustering configurations (chain and tetrahedron) of O-16 were employed in the initialization. O-16+ Au-197 collisions at a beam energy of 40 MeV/nucleon with an impact parameter of 3 fm were simulated; then the collective flow parameters (v(1), v(2), v(3), and v(4)) of free protons were analyzed as a function of both the rapidity and the transverse momentum. It was found that flow parameters (v(1), v(2), v(3), and v(4)) decrease with an increase of the flow order, and that the difference in the flow parameters of free protons caused by the initial a-clustering configurations increases with transverse momentum. In the higher transverse momentum region (0.2-0.25 GeV/c), these flow patterns are quite sensitive to the initial alpha-clustering configurations, and can be regarded as sufficiently sensitive probes that can be used to study the clustering configurations in light nuclei.
机译：在过去几年中，轻质核的alpha聚类配置引起了大量的注意。核反应作为研究这一主题的一种可能方法。本文的目的是讨论费米能量中的重离子碰撞是否可以是调查光核中的集群配置的良好工具。特别地，使用传输模型模拟（16）O + AU-197碰撞以检查任何可观察的变化是否对群集配置敏感。在扩展量子分子动力学模型中，在初始化中使用O-16的两种不同的α聚类配置（链和四面体）。模拟o-16 + Au-197在40 meV / nucleon的光束能量下的碰撞，其撞击参数为3 fm;然后分析自由质子的集体流量参数（V（1），V（2），V（3）和V（4））作为快速和横向动量的函数。发现流量参数（V（1），V（2），V（3）和V（4））随着流量顺序的增加而减小，并且自由质子引起的流量参数的差异初始A簇配置随横向动量增加。在较高的横向动量区域（0.2-0.25 gev / c）中，这些流动模式对初始α聚类配置非常敏感，并且可以被认为是可以用于研究轻质核的聚类配置的足够敏感的探针。

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