An upper limit on cosmic-ray p̄/p flux ratio estimated by the Moon's shadow with the Tibet III air shower array

M. Amenomori, S. Ayabe, D. Chen, W. Cui, Danzengluobu, L. K. Ding, X. H. Ding, C. F. Feng, Z. Y. Feng, X. Y. Gao, Q. X. Geng, H. W. Guo, H. H. He, M. He, I. Ohta, N. Hotta, Haibing Hu, H. B. Hu, J. Huang, Q. HuangH. Y. Jia, F. Kajino, T. Saito, Y. Katayose, C. Kato, K. Kasahara, Labaciren, G. M. Le, J. Y. Li, H. Lu, S. L. Lu, X. R. Meng, K. Mizutani, J. Mu, K. Munakata, A. Nagai, H. Nanjo, M. Nishizawa, M. Ohnishi, H. Onuma, T. Ouchi, Shunsuke Ozawa, J. R. Ren, K. Kawata, Zhaxisangzhu, T. Sasaki, M. Shibata, A. Shiomi, T. Shirai, H. Sugimoto, H. M. Zhang, N. Tateyama, Shoji Torii, H. Tsuchiya, H. Wang, X. Wang, Y. G. Wang, H. R. Wu, L. Xue, M. Takita, Y. Yamamoto, C. T. Yan, X. C. Yang, S. Yasue, Z. H. Ye, G. C. Yu, S. Udo, T. Yuda, J. L. Zhang, N. J. Zhang, X. Y. Zhang, Y. Zhang, Yi Zhang, M. Sakata, A. F. Yuan, Y. H. Tan, K. Hibino*, X. X. Zhou

*この研究の対応する著者

    研究成果

    抄録

    The Tibet air shower array has been in operation since 1999 as Tibet III (22,050m2) with energy threshold of a few TeV. As primary cosmic rays are shielded by the Moon having the finite size of 0.5 degree in diameter, we observe a deficit in cosmic rays called the Moon's shadow with sufficient statistical significance. The center of the Moon's shadow shifts westwardly due to the geomagnetic field. By analyzing this energy-dependent westward displacement carefully, we set an upper limit of about 5% at 90% confidence level on the cosmic-ray antiproton/proton ratio at multi-TeV energies.

    本文言語English
    ホスト出版物のタイトル29th International Cosmic Ray Conference, ICRC 2005
    出版社Tata Institute of Fundamental Research
    ページ45-48
    ページ数4
    6
    出版ステータスPublished - 2005
    イベント29th International Cosmic Ray Conference, ICRC 2005 - Pune
    継続期間: 2005 8 32005 8 10

    Other

    Other29th International Cosmic Ray Conference, ICRC 2005
    CityPune
    Period05/8/305/8/10

    ASJC Scopus subject areas

    • 核物理学および高エネルギー物理学

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