Unified description of nuclear stopping in central heavy-ion collisions from 10A MeV to 1.2A GeV
Unified description of nuclear stopping in central heavy-ion collisions from 10A MeV to 1.2A GeV
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DOI：
10.1103/physrevc.84.034612
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发表时间：
2011-03
影响因子：
3.1
通讯作者：
G. Zhang;Y. Ma;X. Cao;C. Zhou;X. Cai;D. Fang;W. Tian;H. Wang
中科院分区：
文献类型：
--
作者：
G. Zhang;Y. Ma;X. Cao;C. Zhou;X. Cai;D. Fang;W. Tian;H. Wang
在输运模型--同位旋相关的量子分子动力学模型中对核阻止的宽激发函数进行了详细的分析，并与INFANG和FOPI合作组的实验数据进行了比较.发现中心重离子碰撞（HIC）中各向同性的平均值在费米能级附近达到最小值，在300- 400 A MeV附近达到最大值。这表明，在统计平均，平衡是远远没有达到，即使在中央HIC特别是接近费米能。一个层次的停止碎片，这有利于重碎片穿透，提供了一个强大的限制核停止的全球趋势，并可以作为一个探针的核状态方程。
A detailed analysis of the wide excitation function of nuclear stopping has been conducted within a transport model, isospin-dependent quantum molecular dynamics model, and an overall good agreement with the INDRA and FOPI Collaborations' experimental data has been achieved. It is found that the mean value of isotropy in central heavy-ion collision (HIC) reaches a minimum near-Fermi energy and approaches a maximum at around 300-400A MeV. This suggests that, in statistical average, the equilibration is far from being reached, even in central HIC especially near Fermi energy. A hierarchy in the stopping of fragments, which favors heavy fragments to penetrate, provides a robust restriction on the global trend of nuclear stopping and could serve as a probe for nuclear equations of state.