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

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    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.

    Original languageEnglish
    Title of host publication29th International Cosmic Ray Conference, ICRC 2005
    PublisherTata Institute of Fundamental Research
    Pages45-48
    Number of pages4
    Volume6
    Publication statusPublished - 2005
    Event29th International Cosmic Ray Conference, ICRC 2005 - Pune
    Duration: 2005 Aug 32005 Aug 10

    Other

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

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

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  • Cite this

    Amenomori, M., Ayabe, S., Chen, D., Cui, W., Danzengluobu, Ding, L. K., Ding, X. H., Feng, C. F., Feng, Z. Y., Gao, X. Y., Geng, Q. X., Guo, H. W., He, H. H., He, M., Ohta, I., Hotta, N., Hu, H., Hu, H. B., Huang, J., ... Zhou, X. X. (2005). An upper limit on cosmic-ray p̄/p flux ratio estimated by the Moon's shadow with the Tibet III air shower array. In 29th International Cosmic Ray Conference, ICRC 2005 (Vol. 6, pp. 45-48). Tata Institute of Fundamental Research.