怀柔EAS阵列对初级宇宙线“膝”区能谱的测定  

Primary Energy Spectrum of Cosmic Ray at the "Knee" Region Observed with the Huairou Air Array

作　　者：罗光宣[1] 谭有恒[1] 张春生[1] 董玉琚 袁澎[1] 张慧敏[1] 王辉[1] 袁余奎[1] 力京[1] 

机构地区：[1]中国科学院高能物理研究所

出　　处：《高能物理与核物理》1995年第9期769-774,共6页High Energy Physics and Nuclear Physics

摘　　要：仔细分析了近年来怀柔广延大气簇射阵列记录的６５万个大气簇射事例，得到了簇射Ｓｉｚｅ（即荷电总粒子数）谱和１０１５－５×１０１６ｅＶ能段的初级宇宙线微分能谱。此谱呈明显的、平滑过渡的“膝”样结构，拐点在３×１０１５ｅＶ附近．除了“膝”较平滑不象明野谱那样尖锐拐折而外，怀柔谱在绝对流强和“膝”的位置上都与日本明野组吻合得很好．在银河磁场刚度截止模型框架下，怀柔实验Ｓｉｚｅ谱界定的宇宙线质子谱拐折能量Ｅｃ的取值范围在１６０到２４０ＴｅＶ之间．thousands of EAS events recorded by Huairou EAS Array have been analysed carefully. The Size spectrum and primary energy spectrum in the region from 1015 to 1016eV are obtained. The energy spectrum shows a clear and smooth 'Knee' structure around 3×1015eV. Except the smooth steep feature of 'Knee', it is consistent very well with Akeno spectrum. Under the assumption of so-called rigidity dependent cut model, by adjusting the breaking energy Ec of primary proton spectrum in the Monte Carlo simulation and comparing with the experimental spectrum, we found that the proper value of Ec is in the energy range from 160 to 240TeV.

关 键 词：宇宙线 广延 大气簇射 EAS阵列 膝区 

分 类 号：O572.1[理学—粒子物理与原子核物理]