@article{oai:repo.qst.go.jp:00043152,
 author = {Takeda, Masahiro and Sakaki, Naoto and Honda, Ken and Chikawa, Michiyuki and Fukushima, Masaki and Hayashida, Naoaki and Inoue, Naoya and Kadota, Kenji and Kakimoto, Fumio and Kamata, Kouichi and Kawaguchi, Setsuo and Kawakami, Saburo and Kawasaki, Yoshiya and Kawasumi, Norio and Mahrous, A and Mase, Keiichi and Mizobuchi, Tomoko and Morizane, Yuichirou and Nagano, Motohiko and Ohoka, Hideyuki and Osone, Satoko and Sasaki, Makoto and Sasano, Masahiko and Shimizu, Hirohiko and Shinozaki, Kenji and Teshima, Masahiro and Torii, Reiko and Tsushima, Itsurou and Uchihori, Yukio and Yamamoto, Tokonatsu and Yoshida, Shigeru and Yoshii, Hisashi and 榊 直人 and 川崎 賀也 and 内堀 幸夫},
 journal = {Astroparticle Physics},
 month = {},
 note = {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 ultrahigh
energy cosmic rays extends beyond the cutoff energy predicted by Greisen,
and Zatsepin and Kuzmin. In this paper, we reevaluate the energy determination
method used for AGASA events with respect to the lateral distribution of shower
particles, their attenuation with zenith angle, shower front structure, delayed particles
observed far from the core and other factors. The currently assigned energies
of AGASA events have an accuracy of ‘25% in event-reconstruction resolution and
‘18% in systematic errors around 1020eV. This systematic uncertainty is independent
of primary energy above 1019eV. Based on the energy spectrum from 1014.5eV
to a few times 1020eV determined at Akeno, there are surely events above 1020eV
and the energy spectrum extends up to a few times 1020eV without a GZK-cutoff.},
 pages = {447--462},
 title = {Energy determination in the Akeno Giant Air Shower Array experiment},
 volume = {19},
 year = {2003}
}