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New measurement on photon yields from air and the application to the energy estimation of primary cosmic rays
M. Nagano, K. Kobayakawa, N. Sakaki +1
The air fluorescence technique is used to detect ultra-high energy cosmic rays (UHECR), and to estimate their energy. Of fundamental importance is the photon yield due to excitatio…
Signatures of Ultra-High Energy Cosmic Ray Composition from Propagation of Nuclei in Intergalactic Photon Fields
Tokonatsu Yamamoto, Keiichi Mase, Masahiro Takeda +2
We present a calculation of nuclei propagation with energies above 1 EeV in the intergalactic photon field. The calculation is based on a Monte Carlo approach for the nucleus-photo…
Energy determination in the Akeno Giant Air Shower Array experiment
M. Takeda, N. Sakaki, K. Honda +29
Using data from more than ten-years of observations with the Akeno Giant Air Shower Array (AGASA), we published a result that the energy spectrum of ultra-high energy cosmic rays e…
Extension of the Cosmic-Ray Energy Spectrum Beyond the Predicted Greisen-Zatsepin-Kuz'min Cutoff
M. Takeda, N. Hayashida, K. Honda +25
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…