EAS心区次级粒子分布涨落的多重分形结构的研究  

Study on Multifractal Structure of the Distribution Fluctuation of Secondary Perticles in the Core Region of EAS

作　　者：孔繁敏[1] 冯存峰[1] 张学尧[1] 薛良[1] 傅宇[1] 李金玉[1] 张乃健[1] 何瑁[1] 王承瑞[1] 谭有恒[2] 

机构地区：[1]山东大学高能物理研究室,济南250100 [2]中国科学院高能物理研究所,北京100039

出　　处：《高能物理与核物理》2000年第4期279-284,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金;高等学校博士学科点专项科研基金

摘　　要：利用 Ｍｏｎｔｅ Ｃａｒｌｏ模拟数据研究了由γ射线和质子引起的空气簇射中的次级粒子在羊八井ＡＲＧＯ实验中的空间分布的不同，并利用Ｇ矩分析方法对γ射线和质子簇射的次级粒子在心区附近分布的多重分形性质进行了分析．从γ射线和质子事例的谱函数可以看出，利用这种方法，可以作为区分原初γ射线和质子的依据．结果表明在１－１０ＴｅＶ能区可以较好地区分γ射线和质子．The differences of space distributions and time profiles between the γ-ray and proton induced shower particles are studied using Monte Carlo simulation data. The multifractal analysis is performed with the G-moment method for the distribution fluctuation of secondary particles near the core of showers induced by y-rays and protons. From the spectrum functions of γ and proton events, it is seen that this method can be adopted as a basis for the γ/proton separation. It is shown that the separation of γ and proton can be achieved with a good efficiency in the energy region of 1-10TeV.

关 键 词：心区次级粒子 多重分形矩 分布涨落 簇射 EAS 

分 类 号：O572[理学—粒子物理与原子核物理]