An extremely energetic cosmic ray observed by a surface detector array

Abstract

Cosmic rays are energetic charged particles from extraterrestrial sources, with the highest energy events thought to come from extragalactic sources. Their arrival is infrequent, so detection requires instruments with large collecting areas. In this work, we report the detection of an extremely energetic particle recorded by the surface detector array of the Telescope Array experiment. We calculate the particle's energy as 244 +- 29 (stat.) +51,-76 (syst.) exa-electron volts (~40 joules). Its arrival direction points back to a void in the large-scale structure of the Universe. Possible explanations include a large deflection by the foreground magnetic field, an unidentified source in the local extragalactic neighborhood or an incomplete knowledge of particle physics.

arXiv comment20 pages, 3 figures, 1 table, Published in Science on 24 November 2023 (Submitted 8 February 2022; Accepted 19 October 2023)

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• A Hierarchical Shock Model of Ultra-High-Energy Cosmic Rays
• Giant Atmospheric Showers Detected by the Yakutsk Extensive Air Shower Array
• An isotropic full-sky sample of optically selected blazars
• Computed models of natural radiation backgrounds in qubits and superconducting detectors
• Modeling the imprints of large-scale magnetized structures on $\gamma$-rays from extragalactic transients
• Cosmic-Ray Mass Composition around the Knee via Principal Component Analysis
• Amaterasu Cosmic Ray as Possible Support for Electromagnetic Acceleration
• Possible Sources of Iron Nuclei in Ultra-High-Energy Cosmic Rays
• Beyond the Local Void: A data-driven search for the origins of the Amaterasu particle