Effects of in-medium nucleon-nucleon cross sections on stopping observable and ratio of free protons in heavy-ion collisions at 400 MeV/nucleon
Effects of in-medium nucleon-nucleon cross sections on stopping observable and ratio of free protons in heavy-ion collisions at 400 MeV/nucleon
复制标题
中核子-核子截面对 400 MeV/核子重离子碰撞中停止可观测值和自由质子比率的影响
DOI：
10.1140/epja/i2016-16207-x
复制
发表时间：
2016
影响因子：
2.7
通讯作者：
Su J
中科院分区：
文献类型：
--
作者：
Su Jun;Huang Ching-Yuan;Xie Wen-Jie;Xie Wen-Jie;Zhang Feng-Shou;Zhang Feng-Shou;Zhang Feng-Shou;Su J
在IQMD+GEMINI模型的框架下，研究了介质中核子-核子碰撞截面对400 MeV/核子重离子碰撞停止观测值和自由质子比率的影响.模型中采用了五种核子-核子碰撞截面的介质内修正，这五种修正在能量和密度上有很大的差别。人们发现，当介质中横截面减小时，停止的计算会减少。此外，自由质子的比率RP不仅取决于在介质因子的值，而且还取决于它的同位旋依赖性。为了研究介质因子对自由质子比率Rp的影响，对介质因子的同位旋依赖性进行了调整，并将其用于模型中。计算表明，介质因子的同位旋依赖性不影响阻止，但影响自由质子的比率Rp。当模型中采用介质内因子关系fnnmed> fppmed时，计算得到的R_（max）值大于fnnmed <fppmed时的R_（max）值。
The effects of in-medium nucleon-nucleon cross sections on the stopping observable and ratio of free protons in heavy-ion collisions at 400MeV/nucleon have been investigated within the framework of the IQMD+GEMINI model. Five kinds of in-medium corrections of nucleon-nucleon cross sections, which are considerably different in the referred energy and density, have been used in the model. It has been found that calculations of the stopping decrease when the in-medium cross sections decrease. Moreover, the ratio of free protons Rpdepends not only on the value of the in-medium factors but also on its isospin dependence. In order to investigate the isospin effect of in-medium factors on the ratio of free protons Rp, the isospin dependence of in-medium factors has been adjusted and used in the model. The calculations have shown that the isospin dependence of in-medium factors does not impact the stopping, but impacts the ratio of free protons Rp. When the in-medium factors relationfnnmed>fppmedis used in the model, the calculated values of Rpare larger than those in thefnnmed<fppmedcase.