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Measurement of air shower cores to study the cosmic ray composition in the knee energy region

2000; American Physical Society; Volume: 62; Issue: 7 Linguagem: Inglês

10.1103/physrevd.62.072007

1538-4500

M. Amenomori, S. Ayabe, Caidong, Danzengluobu Danzengluobu, L. K. Ding, Z. Y. Feng, Y. Fu, Hangwen Guo, M. He, K. Hibino, N. Hotta, Q. Huang, A. X. Huo, K. Izu, H. Y. Jia, F. Kajino, K. Kasahara, Y. Katayose, Labaciren Labaciren, J. Y. Li, H. Lu, S. L. Lu, Gan Luo, X. R. Meng, K. Mizutani, J. Mu, H. Nanjo, M. Nishizawa, M. Ohnishi, I. Ohta, T. Ouchi, Z. R. Peng, J. R. Ren, T. Saito, M. Sakata, T. Sasaki, Zhi‐Cheng Shi, M. Shibata, A. Shiomi, T. Shirai, H. Sugimoto, K. Taira, Y. H. Tan, N. Tateyama, S. Torii, Toshihiro Utsugi, Chuxiong Wang, H. Wang, X. W. Xu, Y. Yamamoto, G. C. Yu, A. F. Yuan, T. Yuda, C. S. Zhang, H.M. Zhang, J. L. Zhang, N. J. Zhang, X. Y. Zhang, Zhaxiciren Zhaxiciren, Zhaxisangzhu,

Experimental and Theoretical Physics Studies

Since 1996, a hybrid experiment consisting of an emulsion chamber and a burst detector array and the Tibet-II air shower array has been operated at Yangbajing (4300 m above sea level) in Tibet. This experiment can detect air-shower cores, called burst events, accompanied by air showers in excess of about 100 TeV. Using the burst event data observed by this experiment, we discuss the primary cosmic ray composition around the knee in comparison with the Monte Carlo simulations. In this paper, we show that all the features of burst events are wholly compatible with the heavy enriched composition in the knee energy region.