Chemical composition of cosmic rays around the knee observed by the Tibet air-shower-core detector

被引：4

作者：

Amenomori, M. ^{[1
]}

Bi, X. J. ^{[2
]}

Chen, D. ^{[3
]}

Cui, S. W. ^{[4
]}

Danzengluobu ^{[5
]}

Ding, L. K. ^{[2
]}

Ding, X. H. ^{[5
]}

Fan, C. ^{[6
]}

Feng, C. F. ^{[6
]}

Feng, Zhaoyang ^{[2
]}

Feng, Z. Y. ^{[7
]}

Gao, X. Y. ^{[8
]}

Geng, Q. X. ^{[8
]}

Guo, H. W. ^{[5
]}

He, H. H. ^{[2
]}

He, M. ^{[6
]}

Hibino, K. ^{[9
]}

Hotta, N. ^{[10
]}

Hu, Haibing

Hu, H. B. ^{[2
]}

Huang, J. ^{[2
,3
]}

Huang, Q. ^{[7
]}

Jia, H. Y. ^{[7
]}

Kajino, F. ^{[11
]}

Kasahara, K. ^{[12
]}

Katayose, Y. ^{[13
]}

Kato, C. ^{[14
]}

Kawata, K. ^{[3
]}

Labaciren ^{[5
]}

Le, G. M. ^{[15
]}

Li, A. F. ^{[6
]}

Li, J. Y. ^{[6
]}

Lou, Y. -Q. ^{[16
,17
]}

Lu, H. ^{[2
]}

Lu, S. L. ^{[2
]}

Meng, X. R. ^{[5
]}

Mizutani, K. ^{[12
,18
]}

Mu, J. ^{[8
]}

Munakata, K. ^{[14
]}

Nagai, A. ^{[19
]}

Nanjo, H. ^{[1
]}

Nishizawa, M. ^{[20
]}

Ohnishi, M. ^{[3
]}

Ohta, I. ^{[21
]}

Ouchi, T. ^{[9
]}

Ozawa, S. ^{[12
]}

Ren, J. R. ^{[2
]}

Saito, T. ^{[22
]}

Saito, T. Y. ^{[23
]}

Sakata, M. ^{[11
]}

机构：

[1] Hirosaki Univ, Dept Phys, Hirosaki, Aomori 0368561, Japan

[2] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China

[3] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan

[4] Hebei Normal Univ, Dept Phys, Shijiazhuang 050016, Hebei, Peoples R China

[5] Tibet Univ, Dept Math & Phys, Lhasa 850000, Peoples R China

[6] Shandong Univ, Dept Phys, Jinan 250100, Peoples R China

[7] SouthWest Jiaotong Univ, Inst Modern Phys, Chengdu 610031, Peoples R China

[8] Yunnan Univ, Dept Phys, Kunming 650091, Yunnan, Peoples R China

[9] Kanagawa Univ, Fac Engn, Yokohama, Kanagawa 2218686, Japan

[10] Utsunomiya Univ, Fac Educ, Utsunomiya, Tochigi 3218505, Japan

[11] Konan Univ, Dept Phys, Kobe, Hyogo 6588501, Japan

[12] Waseda Univ, Res Inst Sci & Engn, Tokyo 1698555, Japan

[13] Yokohama Natl Univ, Fac Engn, Yokohama, Kanagawa 2408501, Japan

[14] Shinshu Univ, Dept Phys, Matsumoto, Nagano 3908621, Japan

[15] Chinese Acad Sci, Ctr Space Sci & Applicat Res, Beijing 100080, Peoples R China

[16] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[17] Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China

[18] Saitama Univ, Saitama 3388570, Japan

[19] Utsunomiya Univ, Adv Media Network Ctr, Utsunomiya, Tochigi 3218585, Japan

[20] Natl Inst Informat, Tokyo 1018430, Japan

[21] Sakushin Gakuin Univ, Utsunomiya, Tochigi 3213295, Japan

[22] Tokyo Metropolitan Coll Ind Technol, Tokyo 1168523, Japan

[23] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[24] Nihon Univ, Coll Ind Technol, Narashino, Chiba 2758576, Japan

[25] Shonan Inst Technol, Fujisawa, Kanagawa 2518511, Japan

[26] RIKEN, Wako, Saitama 3510198, Japan

[27] Shinshu Univ, Sch Gen Educ, Matsumoto, Nagano 3908621, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2009年 / 78卷

基金：

中国国家自然科学基金; 日本学术振兴会;

关键词：

Air shower experiment; Energy spectrum of Cosmic Rays; Chemical Composition; The knee;

D O I：

10.1143/JPSJS.78SA.206

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Recent results and future prospects of the Tibet air-shower experiment are reported on the all-particle energy spectrum and the chemical composition of cosmic rays around 10 15eV energy range. The knee of the all-particle energy spectrum has been clearly observed at the energy around 4x10(15) eV by Tibet III air-shower array located at Yangbajing, Tibet, China (atmospheric depth 606 g/cm(2), area 37,000 m(2)). The energy spectrum of light components (protons and helium) measured by air-shower-core detector exhibits steeper power index than that of direct measurements below 10(14)eV, leading to decreasing fraction of the light component toward the knee. Hence, it is strongly suggested that the origin of the knee is related with the change of the chemical composition of cosmic rays. A new air-shower-core detector called 'YAC' is under the preparation for explicit measurement of the heavy component.

引用

页码：206 / 209

页数：4

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