Study on the separation of 100 TeV γ-rays from cosmic rays for the Tibet ASγ experiment
Study on the separation of 100 TeV γ-rays from cosmic rays for the Tibet ASγ experiment
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DOI：
10.1088/1674-1137/35/2/009
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发表时间：
2011-02
影响因子：
3.6
通讯作者：
冯朝阳;张毅;刘成;樊超;樊超;李红超;李红超;王博;吴含荣;胡红波;卢红;谭有恒;Z. Feng;Y. Zhang;Chen Liu;C. Fan;Hc Li;Bs Wang;H. Wu;H. Hu;Hong-peng Lu;Y. Tan
中科院分区：
文献类型：
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作者：
冯朝阳;张毅;刘成;樊超;樊超;李红超;李红超;王博;吴含荣;胡红波;卢红;谭有恒;Z. Feng;Y. Zhang;Chen Liu;C. Fan;Hc Li;Bs Wang;H. Wu;H. Hu;Hong-peng Lu;Y. Tan
本文描述了在西藏ASγ探测器配置上观测到的一次能量大于100 TeV的空气簇射事件的γ/强子分离分析。阵雨年龄和大小参数拟合从测量的横向密度分布，并作为判别变量。根据MC模拟，同时考虑到由数据和MC比较估计的系统不确定性，发现可以拒绝70%的宇宙线（CR）背景，而可以保留78%以上的γ射线。这样，对100 TeV γ射线的观测灵敏度至少可提高40%。
A γ/hadron separation analysis is described for the observed air shower events with primary energy above 100 TeV based on the Tibet ASγ detector configuration. The shower age and size parameters are fitted from the measured lateral density distribution and used as discrimination variables. According to the MC simulation while taking into account the systematic uncertainty estimated from data and MC comparison, it is found that 70% of the cosmic ray (CR) background can be rejected while more than 78% of the γ-rays can be retained. Sensitivity for 100 TeV γ-rays observation can thus be improved by at least 40%.