The Study of Primary Cosmic Ray Mass Composition Around the

YANG Hong-Tao; LIU Jun; GENG Qing-Xi; LIU Chang-Qin; ZHANG Pin; GAO Xiao-Yu; ZHA Min; JING Gui-Ru; JING Cai-Liu; ZHU Qing-Qi; Cheung T; Leung K; NG L

Chinese Physics C> 2006, Vol. 30> Issue(6) : 497-500

The Study of Primary Cosmic Ray Mass Composition Around the

Cosmic Ray Research Institute of Yunnan University, Kunming 650091,China2 Institute of High Energy Physics, CAS, Beijing 100049,China3 City University of Hong Kong, Hong Kong, China4 Hong Kong Institute of Education, Hong Kong, China

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Abstract：
The lg N_e-N_μ relationship has been studied from 4.4×10⁴ events (total observation time is 2.9×10⁶s)collected from Mt. Liang Wang Array (24.5°N, 102.9°E, 2720m above sea level). In order to study the mass composition at the knee, Monte-Carlo simulations for the EAS development and detection under same event selection criteria as used in the experimental data have been performed. The result shows that the mass composition of primary cosmic rays has no obvious change and the dominant component is light nuclei around the knee.

References

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YANG Hong-Tao, LIU Jun, GENG Qing-Xi, LIU Chang-Qin, ZHANG Pin, GAO Xiao-Yu, ZHA Min, JING Gui-Ru, JING Cai-Liu, ZHU Qing-Qi, Cheung T, Leung K and NG L. The Study of Primary Cosmic Ray Mass Composition Around the[J]. Chinese Physics C, 2006, 30(6): 497-500.

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Received: 2004-11-30
Revised: 2006-01-04

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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

The Study of Primary Cosmic Ray Mass Composition Around the

Corresponding author: YANG Hong-Tao,

Cosmic Ray Research Institute of Yunnan University, Kunming 650091,China2 Institute of High Energy Physics, CAS, Beijing 100049,China3 City University of Hong Kong, Hong Kong, China4 Hong Kong Institute of Education, Hong Kong, China

Received Date: 2004-11-30

Accepted Date: 2006-01-04

Available Online: 2006-06-05

Abstract: The lg N_e-N_μ relationship has been studied from 4.4×10⁴ events (total observation time is 2.9×10⁶s)collected from Mt. Liang Wang Array (24.5°N, 102.9°E, 2720m above sea level). In order to study the mass composition at the knee, Monte-Carlo simulations for the EAS development and detection under same event selection criteria as used in the experimental data have been performed. The result shows that the mass composition of primary cosmic rays has no obvious change and the dominant component is light nuclei around the knee.

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