Characteristics of the Transtion Curves of Showers and Discrimination of γ-Rays and Hadrons in Iron Emulsion Chambers

JI Xiao-Bin; FU Yu; XUE Liang; ZHANG Xue-Yao; LI Jie; LI Jin-Yu; ZHANG Nai-Jian; He Mao; REN Jing-Ru; LU Sui-Ling

Chinese Physics C> 2001, Vol. 25> Issue(10) : 1012-1016

Characteristics of the Transtion Curves of Showers and Discrimination of γ-Rays and Hadrons in Iron Emulsion Chambers

Department of Physics, Shandong University, Jinan 250100, China2 Intitute of High Energy Phyics, CAS, Beijing 100039, China

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Abstract：
The GEANT3 code, a general software for detector simulations widely used in the experi- ments of particle physics, is introduced to the Monte Carlo simulation of iron emulsion chambers. Some haracteristics of transition curves of cascade shower and their FWHM (Full Width of Half Maximum) are studied. The probability of discriaminating hadrons from gamma rays using the FWHM distributions for the shower events with starting depth Δt<6c. u. is discussed and an efficient joint criterion of discriminating hadrons from γ-rays in iron emulsion chambers is obtained.

References

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REN Jing–Ru, HUO An–Xiang, LU Sui–Ling et al. Phys. Rev. 1988, D38(5): 14042 ZHANG Nai–Jian, WANG Cheng–Rui, HE Mao et al. High Energy Phys. and Nucl. Phys., 1989, 13(11 ):961(in Chinese)(张乃健,王承瑞,何瑁等.高能物理与核物理,1989,13(11):961)3 Kasahara K. Phys. Rev., 1985, D3l(11):2337 4 Geant Team. [R]. CERN DD/EE/90/1, 1990 5 REN Jing–Ru, LU Sui–Ling, SU Shi et al. High Energy Phys. and Nucl. Phys., 1990, 14(11 ):961(in Chinese)(任敬儒,陆穗苓,苏实等.高能物理与核物理,1990,14(11):961)

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JI Xiao-Bin, FU Yu, XUE Liang, ZHANG Xue-Yao, LI Jie, LI Jin-Yu, ZHANG Nai-Jian, He Mao, REN Jing-Ru and LU Sui-Ling. Characteristics of the Transtion Curves of Showers and Discrimination of γ-Rays and Hadrons in Iron Emulsion Chambers[J]. Chinese Physics C, 2001, 25(10): 1012-1016.

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Received: 2001-01-16
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Characteristics of the Transtion Curves of Showers and Discrimination of γ-Rays and Hadrons in Iron Emulsion Chambers

Corresponding author: JI Xiao-Bin,

Department of Physics, Shandong University, Jinan 250100, China2 Intitute of High Energy Phyics, CAS, Beijing 100039, China

Received Date: 2001-01-16
Accepted Date: 1900-01-01
Available Online: 2001-10-05

Abstract: The GEANT3 code, a general software for detector simulations widely used in the experi- ments of particle physics, is introduced to the Monte Carlo simulation of iron emulsion chambers. Some haracteristics of transition curves of cascade shower and their FWHM (Full Width of Half Maximum) are studied. The probability of discriaminating hadrons from gamma rays using the FWHM distributions for the shower events with starting depth Δt<6c. u. is discussed and an efficient joint criterion of discriminating hadrons from γ-rays in iron emulsion chambers is obtained.