本文關鍵詞： 角度歧離 能量歧離 蒙特卡羅方法 Geant4 核壽命　出處：《吉林大學》2017年碩士論文　論文類型：學位論文

【摘要】：核壽命指核狀態(tài)之間的躍遷概率,本文所指壽命是激發(fā)態(tài)放出γ射線后退激的躍遷壽命。針對目標實驗,為探究重粒子束與靶物質發(fā)生相互作用所產生的方向歧離可能對實驗結果產生的影響,開展本研究。本工作用Geant4軟件將蒙特卡羅方法應用于對具體實驗的模擬,通過改變變量,對不同條件下出射束流的方向歧離程度進行分析,從而判斷不同變量對實驗結果的影響。蒙特卡羅方法是一種以概率統(tǒng)計理論為基礎的數值計算方法,又稱統(tǒng)計模擬法,是當今應用較為廣泛的模擬分析方法。這種方法可以較為全面的對實驗進行模擬,一些實驗由于實驗成本等問題,需要在實際操作實驗前對實驗結果進行預測,探究實驗設計的合理性,以在實際實驗中得到更好的結果。本次研究具體工作內容有:(1)保持入射束流種類及能量不變,通過改變靶物質的厚度,研究出射束流的方向歧離情況。(2)保持入射束流能量以及靶厚度不變,改變入射束流種類,分別研究出射束流的方向歧離程度。(3)保持入射束流種類以及靶厚度不變,改變入射束流能量,研究出射束流的方向歧離程度。
[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 緯 -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.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O571.6

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本文編號：1481962