Energy determination in the Akeno Giant Air Shower Array experiment

By M. Takeda, N. Sakaki, K. Honda, M. Chikawa, M. Fukushima, N. Hayashida, N. Inoue, K. Kadota, F. Kakimoto, K. Kamata and 22 more. 2002

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Abstract Using data from more than 10 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 extends beyond the cutoff energy predicted by Greisen [Rhys. Rev. Lett. 16 (1966) 748] and Zatsepin and Kuzmin [Zh. Eksp. Teor. Fiz. 4 (1966) 114]. 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 10 20 eV. This systematic uncertainty is independent of primary energy above 10 19 eV. Based on the energy spectrum from 10 14.5 eV to a few times 10 20 eV determined at Akeno, there are surely events above 10 20 eV and the energy spectrum extends up to a few times 10 20 eV without a GZK cutoff.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/86fb1b6e8377f312b78498dc2e8b3c8da6e4b0d6

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Citations in the corpus

• The POEMMA (Probe of Extreme Multi-Messenger Astrophysics) observatory (2020, methodology): “A succession of increasingly large ground-based experiments (Fly’s Eye [8], AGASA [9], and HiRes [10]) paved the way for the two leading ground-based observatories currently in operation: the Pierre Auger Observatory [11, 12] in the Southern Hemisphere, with ∼80,000 km2 sr yr exposure in 14 years of”