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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

  • 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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    [1] TAN You–Heng. HEP NP, 1999, 23(2) :103 (in Chinese)(谭有恒.高能物理与核物理,1999,23(2) :103)2 KONG Fan–Min, FENG Cun–Feng, ZHANG Xue–Yao et al. Chin. Jour. of Computational phys. 2000, 17(3) :280 (in Chinese)(孔繁敏,冯存峰,张学尧等.计算物理,2000,17(3) :280) 3 Haeusler R, Badea A F, Rebel H et al. Astropart. Phys., 2002, 17:421

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