Identification of Primary Y-Rays by the Characteristics of Time-Space Structure of the Cosmic-Ray Air Showers

FENG Gun-Feng; ZHANG Xue-Yao; WANG Yong-Gang; XUE Liang; MA Li-Na; LI Jin-Yu; ZHANG Nai-Jian

Chinese Physics C> 2003, Vol. 27> Issue(11) : 969-972

Identification of Primary Y-Rays by the Characteristics of Time-Space Structure of the Cosmic-Ray Air Showers

Department of Physics, Shandong University, Ji'nan 250100, China

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Abstract：
The time-space structure of particles for individual air showers induced by primary γ-rays and protons at the observation level is analysed by Monte Carlo simulation. It is shown that air showers induced by the primary γ-rays can be effectively separated from the air showers induced by protons (background) using the combination cuts on the arrival time fluctuation and the lateral distribution width of secondary particles in air showers. This method can be used for reducing the background of hadrons in searching for γ-ray point sources for ARGO experiment coorperated by China and Italy at Yangbajing. The effect of this method on the significance of γ-ray signals is also estimated.

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FENG Gun-Feng, ZHANG Xue-Yao, WANG Yong-Gang, XUE Liang, MA Li-Na, LI Jin-Yu and ZHANG Nai-Jian. Identification of Primary Y-Rays by the Characteristics of Time-Space Structure of the Cosmic-Ray Air Showers[J]. Chinese Physics C, 2003, 27(11): 969-972.

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Received: 2003-03-24
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Identification of Primary Y-Rays by the Characteristics of Time-Space Structure of the Cosmic-Ray Air Showers

Corresponding author: FENG Gun-Feng,

Department of Physics, Shandong University, Ji'nan 250100, China

Received Date: 2003-03-24

Accepted Date: 1900-01-01

Available Online: 2003-11-05

Abstract: The time-space structure of particles for individual air showers induced by primary γ-rays and protons at the observation level is analysed by Monte Carlo simulation. It is shown that air showers induced by the primary γ-rays can be effectively separated from the air showers induced by protons (background) using the combination cuts on the arrival time fluctuation and the lateral distribution width of secondary particles in air showers. This method can be used for reducing the background of hadrons in searching for γ-ray point sources for ARGO experiment coorperated by China and Italy at Yangbajing. The effect of this method on the significance of γ-ray signals is also estimated.

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Identification of Primary Y-Rays by the Characteristics of Time-Space Structure of the Cosmic-Ray Air Showers

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