Analysis of angular distribution of fragments in relativistic heavy-ion collisions by quantum molecular dynamics
Analysis of angular distribution of fragments in relativistic heavy-ion collisions by quantum molecular dynamics
复制标题
量子分子动力学分析相对论性重离子碰撞中碎片的角分布
DOI：
10.1051/epjconf/201611703011
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发表时间：
2016
影响因子：
--
通讯作者：
Shintaro Hashimoto and Koji Niita
中科院分区：
文献类型：
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作者：
Tatsuhiko Ogawa;Tatsuhiko Sato;Shintaro Hashimoto and Koji Niita
为了预测核-核碰撞产生碎片的角分布，改进了JAERI量子分子动力学模型（JQMD）。由于JQMD低估了前角破片，而前角破片主要是由周边碰撞产生的，因此对JQMD进行了修正，以便更准确地模拟周边碰撞。为此目的，密度依赖的介质内效应和相对论效应的核子核子相互作用被纳入。修订版的JQMD加上一个统计衰变模型被用来计算在早期的研究中测得的差分碎片产生截面。通过对JQMD和修正后的JQMD的实测数据和计算结果的比较，表明修正后的JQMD能更好地预测破片的角分布。特别地，在前向角中的碎片产率的一致性得到显著改善。
To predict angular distribution of fragments produced in nucleusnucleus collisions, JAERI quantum molecular dynamics model (JQMD) was improved. Because JQMD underestimated fragments in the forward angle, which were mainly produced by peripheral collisions, JQMD was revised so as to simulate peripheral collisions accurately. Density-dependent in-medium effect and relativistic effect on nucleonnucleon interactions were incorporated for this purpose. The revised version of JQMD coupled with a statistical decay model was used to calculate differential fragment production cross sections measured in earlier studies. Comparison of the measured data and calculation by the revised and old JQMD showed that the revised JQMD can predict fragment angular distribution better than old JQMD. Particularly, agreement of fragment yield in the forward angle is substantially improved.