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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. Teshima M. Proc. of 23rd ICRC. Calgary, Inv., Rap. Highlight Papers, 1993. 2572. GAO X Y, Leung K C, YANG H T et al. A New Under-ground Muon Detector on Mt. Liang Wang. 24th Interna-tional Cosmic Ray Conference(Vol.1). Roma, 1995. 978-9813. Ng L K, GAO X Y, YANG Z T et al. New Gammaray Observatory on Mt. Liang Wang. Protheroe R J. In: 21st In-ternational Cosmic Ray Conference(Vol.4). Australia, 1990,286?894. GAO X Y, Leung K C, YANG H T et al. The EAS MuonDetection on Mt. Liang Wang. ZHU Q Q. In: CCAST-WLWorkshop Series(Vol.48). Beijing: CCAST(World Laboratory) Workshop, 1995. 121-28 (in Chinese)(高晓宇，梁淦章，杨洪涛等.梁王山站EAS的f探测.朱清棋编辑.见:COAST-WL、workshop Series(48卷).北京:CCAST(World Laboratory)、workshop, 1995. 121-128)5. Leung K C. Muon Detector Array To Discriminate-Ray EAS at Mountain Altitude. Doctor Degree Thesis of Hongkong University, 19956. Bennett S, Greisen K. Physical Review, 1961, 124(6):1982—19877. ZHA Min, CHUENG Tsang, DING Lin-Kai et al. ChinesePhysics Letters, 1999, 16(8): 622—6248. Swordy S P, Kieda D B. The Composition near the ‘Knee’from Multiparameter Measurements of Air Showers. KiedaD, Salamon M, Dingus B. In: 26th International CosmicRay Conference. Utah: 26th ICRC Committee, 19999. Haungs A, Antoni T, Apel W D et al. Cosmic Ray Energy Spectrum around the Knee by Muon Density Measurements at KASCADE. Kieda D, Salamon M, Dingus B.In: 26th International Cosmic Ray Conference. Utah: 26th ICRC Committee, 1999

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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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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.