不同测量条件下μ子源项特征模拟  

A Monte-Carlo Simulation on the Characteristics of Cosmic-Ray Muons at Various Measuring Conditions

作　　者：肖洒[1] 帅茂兵[1] 何伟波[1] 兰明聪[1] 

机构地区：[1]中国工程物理研究院材料研究所,四川江油621907

出　　处：《核电子学与探测技术》2017年第4期402-406,共5页Nuclear Electronics & Detection Technology

基　　金：中国工程物理研究院科学技术发展基金(2015B0103014)资助

摘　　要：采用CRY宇宙射线模拟软件包,获取不同测量条件下μ子的特征信息,研究不同条件下宇宙射线中μ子的通量、能谱、角分布等特征规律。研究结果表明:太阳活动极大时会使μ子通量降低;地磁场的影响使得赤道附近的μ子通量比极地地区要小且能谱蓝移;海拔升高则会显著增大μ子通量,但总体能量均值降低。模拟结果与相关实验结果具有很好的一致性。A precise, detailed description of the characteristics （such as flux, energy spectrum and angular distribution） of the natural cosmic - ray muons was significant for muon tomography. However, the muon characteristics may vary from day to day, and location to location, as a result of the effects of the solar cycle, geomagnetic field and atmosphere. For a comprehensive study on the effects, a Monte Carlo simulation was applied based on the 1976US model of atmosphere to explore how the flux, energy spectrum and angular distribution of muons were changed as the measuring conditions varied. The data were obtained using the code＂Cosmic RaY generator＂（CRY）. The results demonstrated that the flux was reduced at the solar maximum or near the equator, where the geomagnetic field blue - shifted the spectrum. As well, the flux was definitely increased at elevated locations while the mean energy dropped away. The simulation results agreed well with previous exnerimental data.

关 键 词：μ子成像 太阳活动周期 地磁场 海拔高度 

分 类 号：TL81[核科学技术—核技术及应用]