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arXiv · 0711.2002

New estimation of the spectral index of high-energy cosmic rays as determined by the Compton-Getting anisotropy

M. Amenomori·X. J. Bi·D. Chen·S. W. Cui·Danzengluobu·L. K. Ding·X. H. Ding·C. Fan·C. F. Feng·Zhaoyang 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. Huang·H. Y. Jia·F. Kajino·K. Kasahara·Y. Katayose·C. Kato·K. Kawata·Labaciren·G. M. Le·A. F. Li·J. Y. Li·Y. -Q. Lou·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·S. Ozawa·J. R. Ren·T. Saito·T. Y. Saito·M. Sakata·T. K. Sako·M. Shibata·A. Shiomi·T. Shirai·H. Sugimoto·M. Takita·Y. H. Tan·N. Tateyama·S. Torii·H. Tsuchiya·S. Udo·B. Wang·H. Wang·X. Wang·Y. 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
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Abstract

The amplitude of the Compton-Getting (CG) anisotropy contains the power-law index of the cosmic-ray energy spectrum. Based on this relation and using the Tibet air-shower array data, we measure the cosmic-ray spectral index to be $-3.03 \pm 0.55_{stat} \pm < 0.62_{syst}$ between 6 TeV and 40 TeV, consistent with $-$2.7 from direct energy spectrum measurements. Potentially, this CG anisotropy analysis can be utilized to confirm the astrophysical origin of the ``knee'' against models for non-standard hadronic interactions in the atmosphere.

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M. Amenomori, X. J. Bi, D. Chen, S. W. Cui, Danzengluobu, L. K. Ding, X. H. Ding, C. Fan, C. F. Feng, Zhaoyang 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. Huang, H. Y. Jia, F. Kajino, K. Kasahara, Y. Katayose, C. Kato, K. Kawata, Labaciren, G. M. Le, A. F. Li, J. Y. Li, Y. -Q. Lou, 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, S. Ozawa, J. R. Ren, T. Saito, T. Y. Saito, M. Sakata, T. K. Sako, M. Shibata, A. Shiomi, T. Shirai, H. Sugimoto, M. Takita, Y. H. Tan, N. Tateyama, S. Torii, H. Tsuchiya, S. Udo, B. Wang, H. Wang, X. Wang, Y. 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. 2007-11-13. New estimation of the spectral index of high-energy cosmic rays as determined by the Compton-Getting anisotropy. https://doi.org/10.1086/525526

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