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Ultraheavy Ultrahigh-Energy Cosmic Rays

Published 27 May 2024 in astro-ph.HE, hep-ph, and nucl-th | (2405.17409v2)

Abstract: We investigate the propagation of ultraheavy (UH) nuclei as ultrahigh-energy cosmic rays (UHECRs). We show that their energy loss lengths at $\lesssim300$~EeV are significantly longer than those of protons and intermediate-mass nuclei, and that the highest-energy cosmic rays with energies beyond $\sim100$ EeV, including the Amaterasu particle, may originate from such UH-UHECRs. We derive constraints on the contribution of UH-UHECR sources, and find that they are consistent with energy generation rate densities of UHECRs from collapsars and neutron star mergers.

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