重离子束在靶物质中方向歧离的模拟分析

发布时间：2018-02-01 13:26

本文关键词： 角度歧离能量歧离蒙特卡罗方法 Geant4 核寿命　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：核寿命指核状态之间的跃迁概率,本文所指寿命是激发态放出γ射线后退激的跃迁寿命。针对目标实验,为探究重粒子束与靶物质发生相互作用所产生的方向歧离可能对实验结果产生的影响,开展本研究。本工作用Geant4软件将蒙特卡罗方法应用于对具体实验的模拟,通过改变变量,对不同条件下出射束流的方向歧离程度进行分析,从而判断不同变量对实验结果的影响。蒙特卡罗方法是一种以概率统计理论为基础的数值计算方法,又称统计模拟法,是当今应用较为广泛的模拟分析方法。这种方法可以较为全面的对实验进行模拟,一些实验由于实验成本等问题,需要在实际操作实验前对实验结果进行预测,探究实验设计的合理性,以在实际实验中得到更好的结果。本次研究具体工作内容有:(1)保持入射束流种类及能量不变,通过改变靶物质的厚度,研究出射束流的方向歧离情况。(2)保持入射束流能量以及靶厚度不变,改变入射束流种类,分别研究出射束流的方向歧离程度。(3)保持入射束流种类以及靶厚度不变,改变入射束流能量,研究出射束流的方向歧离程度。
[Abstract]:The nuclear lifetime refers to the transition probability between the nuclear states. In this paper, the lifetime is the transition life of the excited state emitting 纬 -ray retrogression. In order to investigate the possible effect of the direction divergence caused by the interaction between the heavy particle beam and the target material on the experimental results. The Monte Carlo method is applied to the simulation of specific experiments with Geant4 software. By changing the variables, the degree of directional divergence of the outgoing beam under different conditions is analyzed. Monte Carlo method is a numerical method based on probability and statistics theory, also called statistical simulation method. This method can be used to simulate the experiment comprehensively. Some experiments need to predict the experimental results before the actual operation because of the cost of the experiment. To explore the rationality of the experimental design in order to obtain better results in the actual experiment. The specific work of this study is to keep the type of incident beam and energy unchanged by changing the thickness of the target material. It is found that the direction of the beam is different. 2) the incident beam energy and the target thickness are kept constant, and the type of incident beam is changed. The degree of directional dissociation of the beam is studied respectively) to keep the type of incident beam and the thickness of target unchanged, to change the energy of incident beam, and to study the degree of directional divergence of beam.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O571.6

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