Absolute energy scale calibration of multi-TeV cosmic rays using the moon's shadow observed by the Tibet air shower array

M. Amenomori, S. Ayabe, D. Chen, S. 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, K. Hibino, N. Hotta, Haibing Hu, H. B. Hu, J. Huang, Q. HuangH. Y. Jia, F. Kajino, K. Kasahara, Y. Katayose, C. Kato, K. Kawata, 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, I. Ohta, H. Onuma, T. Ouchi, Shunsuke Ozawa, J. R. Ren, T. Saito, M. Sakata, T. Sasaki, M. Shibata, A. Shiomi, T. Shirai, H. Sugimoto, M. Takita, Y. H. Tan, N. Tateyama, Shoji Torii, H. Tsuchiya, S. Udo, H. Wang, X. Wang, Y. G. Wang, H. R. Wu, L. Xue, Y. Yamamoto, C. T. Yan, X. C. Yang, S. Yasue, Z. H. Ye, G. C. Yu, A. F. Yuan, T. Yuda, H. M. Zhang, J. L. Zhang, N. J. Zhang, X. Y. Zhang, Y. Zhang, Yi Zhang, Zhaxisangzhu, X. X. Zhou

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

    6 Citations (Scopus)

    Abstract

    The Tibet air shower array has been in operation since 1999 as Tibet III with an energy threshold of a few TeV. As primary cosmic rays are shielded by the Moon having the finite size of 0.5° in diameter, we observe a deficit in cosmic rays called the Moon's shadow with a significance of 40 α level for 1041 live days. The center of the Moon's shadow shifts westward depending on primary cosmic-ray energies due to the geomagnetic field. We calibrate the absolute energy scale of the primary cosmic rays observed by the Tibet III array using this effect. The Moon's shadow simulation, including a precise calculation of the geomagnetic effect, shows a good agreement with observational data. As a result, the systematic error in the absolute energy scale is estimated to be less than approximately ± 8% level by means of the geomagnetic field as a spectrometer.

    Original languageEnglish
    Title of host publication29th International Cosmic Ray Conference, ICRC 2005
    PublisherTata Institute of Fundamental Research
    Pages53-56
    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, S. 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., Hibino, K., Hotta, N., Hu, H., Hu, H. B., Huang, J., ... Zhou, X. X. (2005). Absolute energy scale calibration of multi-TeV cosmic rays using the moon's shadow observed by the Tibet air shower array. In 29th International Cosmic Ray Conference, ICRC 2005 (Vol. 6, pp. 53-56). Tata Institute of Fundamental Research.