CSR外靶实验终端中子流测量的模拟  

Measurement of Neutron Flow with the External Target Experimental Device on CSR

作　　者：付芬[1] 肖志刚[1] 靳根明[1] 冯兆庆[1] 

机构地区：[1]中国科学院近代物理研究所

出　　处：《高能物理与核物理》2006年第11期1083-1087,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10205020);中国科学院知识创新工程方向性项目(KJCX2-SW-N07)资助~~

摘　　要：随着兰州重离子加速器冷却储存环(HIRFL-CSR)外靶实验终端中子墙的建立,为实验测量高能中子提供了机遇．为确定CSR外靶实验终端对中子流测量的可行性,基于BUU理论模型分别对对称系统(Ni+Ni,Pb+Pb)和非对称系统(Pb+Ni)进行了模拟计算,发现当系统能量达到几百MeV／u时,中子流信号相当明显,并与碰撞参数有明显的依赖关系．模拟结果表明,在前角20°的覆盖范围内,可以较好地实现中子流测量所需要的反应平面确定及碰撞参数选择．对双击事件及其对中子流的影响进行了简单的讨论．With the construction of the neutron detection wall at the external target position on Heavy Ion Research Facility in Lanzhou-Cooling Storage Ring （IRHFL-CSR）, it will be possible to detect high energy neutron. A BUU model is applied to simulate the flow in both symmetric （Ni＋Ni, Pb＋Pb） and asymmetric（Pb＋Ni） systems. It is shown that at above several hundreds MeV/u, the flow signals are very obvious and depend clearly on the centrality of the collisions. Based on the products in the forward angle less than 20°, the simulation also reveals that the determination of the reaction plane and the selection of the impact parameter, both of which are essential in the flow measurement, are well implemented. The double event and its influence on the determination of the neutron flow are also simulated.

关 键 词：CSR 中子流 反应平面 碰撞参数 

分 类 号：O571.5[理学—粒子物理与原子核物理]