Extension of the Cosmic-Ray Energy Spectrum Beyond the Predicted Greisen-Zatsepin-Kuz'min Cutoff

@article{Takeda1998ExtensionOT,
  title={Extension of the Cosmic-Ray Energy Spectrum Beyond the Predicted Greisen-Zatsepin-Kuz'min Cutoff},
  author={M. Takeda and N. Hayashida and K. Honda and N. Inoue and K. Kadota and F. Kakimoto and K. Kamata and S. Kawaguchi and Y. Kawasaki and N. Kawasumi and H. Kitamura and E. Kusano and Y. Matsubara and K. Murakami and M. Nagano and D. Nishikawa and H. Ohoka and N. Sakaki and M. Sasaki and K. Shinozaki and N. Souma and M. Teshima and R. Torii and I. Tsushima and Y. Uchihori and T. Yamamoto and S. Yoshida and H. Yoshii},
  journal={Physical Review Letters},
  year={1998},
  volume={81},
  pages={1163-1166}
}
The cosmic-ray energy spectrum above 10^{18.5} eV is reported using the updated data set of the Akeno Giant Air Shower Array (AGASA) from February 1990 to October 1997. The energy spectrum extends beyond 10^{20} eV and the energy gap between the highest energy event and the others is being filled up with recently observed events. The spectral shape suggests the absence of the 2.7 K cutoff in the energy spectrum or a possible presence of a new component beyond the 2.7 K cutoff. 
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