Study on the separation of 100 TeV <EM>γ</EM>-rays from cosmic rays for the Tibet AS<EM>γ</EM> experiment

FENG Zhao-Yang; ZHANG Yi; LIU Cheng; FAN Chao; LI Hong-Chao; WANG Bo; WU Han-Rong; HU Hong-Bo; LU Hong; TAN You-Heng

doi:10.1088/1674-1137/35/2/009

Chinese Physics C> 2011, Vol. 35> Issue(2) : 153-157 DOI: 10.1088/1674-1137/35/2/009

Study on the separation of 100 TeV γ-rays from cosmic rays for the Tibet ASγ experiment

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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%.

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FENG Zhao-Yang, ZHANG Yi, LIU Cheng, FAN Chao, LI Hong-Chao, WANG Bo, WU Han-Rong, HU Hong-Bo, LU Hong and TAN You-Heng. Study on the separation of 100 TeV γ-rays from cosmic rays for the Tibet ASγ experiment[J]. Chinese Physics C, 2011, 35(2): 153-157. doi: 10.1088/1674-1137/35/2/009

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Received: 2010-03-01
Revised: 2010-07-13

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沈阳化工大学材料科学与工程学院沈阳 110142

Study on the separation of 100 TeV γ-rays from cosmic rays for the Tibet ASγ experiment

Received Date: 2010-03-01
Accepted Date: 2010-07-13
Available Online: 2011-02-05

Abstract: 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%.