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

1998/07/18 by M. Takeda, N. Hayashida, K. Honda +29 · 5 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #astro-ph

paper · pdf · doi:10.1103/physrevlett.81.1163

published as Phys.Rev.Lett. 81 (1998) 1163-1166 · to be published in PRL, 3 figures, REVTEX format

arxiv created 1998/07/18 · openalex publication_date 1998/08/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

Abstract

The cosmic-ray energy spectrum above 10^18.5eV is reported using the updated data set of the Akeno Giant Air Shower Array from February 1990 to October 1997. The energy spectrum extends beyond 10²⁰eV 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.

Cited by

• Deep shower interpretation of the cosmic ray events observed in excess of the Greisen-Zatsepin-Kuzmin energy
• Statistical Significance of Small‐Scale Anisotropy in Arrival Directions of Ultra–High‐Energy Cosmic Rays
• Diagnostic potential of cosmic-neutrino absorption spectroscopy
• Energy determination in the Akeno Giant Air Shower Array experiment
• Physical cosmology [wikipedia]