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Cosmic Ray Composition in the “Knee”Region Deduced from the Lateral Distribution of Cerenkov Light Emitted in Extensive Air Showers |
| ZHA Min1;CHUENG Tsang3;DING Lin-kai1;GAO Xiao-yu2;GENG Qing-xi2;LIU Chang-qin2;NG Pun-Hon4;YANG Hong-tao2;ZHU Qing-qi1 |
| 1Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039
2Institute of Cosmic Rays, Yunnan University, Kunming 650092
3Department of Physics and Materials Science, City University of Hong Kong, Hong Kong
4Department of Science and Mathematics, Hong Kong Institute of Education, Hong Kong
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| Cite this article: |
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ZHA Min, CHUENG Tsang, DING Lin-kai et al 1999 Chin. Phys. Lett. 16 622-624 |
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Abstract We report the first result of measurements of the lateral distribution of Cerenkov light associated with cosmic ray extensive air showers with size between 105.0 and 106.6 observed in the Liangwang Mountain Observatory, 90 km east of Kunming City in China. The change trend towards heavy nucleus dominance of the primary cosmic ray composition in the “Knee”region is deduced with the aid of a Monte Carlo simulation.
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| Keywords:
98.70.Sa
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Published: 01 August 1999
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| PACS: |
98.70.Sa
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(Cosmic rays (including sources, origin, acceleration, and interactions))
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