Results 11 to 20 of about 3,083 (223)
ULTRA HIGH ENERGY COSMIC RAYS [PDF]
Thinking, Observing and Mining the Universe, 2004 The origin of the cosmic rays at energies in excess of 1020 eV is puzzling the scientific community for several decades now. The mystery adds to the general problem of understanding the nature of the bulk of cosmic rays, that are usually assumed to be accelerated within the Milky Way. Here we summarize the main elements of the observations and propose
Protheroe, R., Clay, R.
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Ultra-High energy cosmic rays [PDF]
Journal of Physics: Conference Series, 2021 Abstract An overview of the status of the knowledge in the field of ultra-high energy cosmic rays is presented. The latest results on the spectrum, arrival direction distribution and composition measurements are summarized and some implications for the understanding of the cosmic ray origin and their propagation are discussed.
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Ultra high energy cosmic rays: The disappointing model [PDF]
Astroparticle Physics, 2010 We develop a model for explaining the data of Pierre Auger Observatory (Auger) for Ultra High Energy Cosmic Rays (UHECR), in particular, the mass composition being steadily heavier with increasing energy from 3 EeV to 35 EeV. The model is based on the proton-dominated composition in the energy range (1 - 3) EeV observed in both Auger and HiRes ...
Roberto Aloisio +2 more
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Ultra-high-energy cosmic rays [PDF]
Physics Reports, 2019 Matching version accepted for publication in Physics Reports. This article builds upon the content of arXiv:hep-ph/0206072, arXiv:astro-ph/0402371, arXiv:hep-ph/0407020, arXiv:1104.0509, arXiv:1307.5312, arXiv:1505.02153, arXiv:1709.07321, arXiv:1801.06160, and arXiv:1801 ...
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Ultra high energy cosmic rays from cosmological relics [PDF]
Nuclear Physics B - Proceedings Supplements, 2000 Invited talk at TAUP-99, Paris, September 6 - 10, 1999.
V. Berezinsky
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Ultra high energy cosmic rays [PDF]
Surveys in High Energy Physics, 1999 The current status of Ultra High Energy Cosmic Rays (UHECR) is reviewed, with emphasis given to theoretical interpretation of the observed events. The galactic and extragalactic origin, in case of astrophysical sources of UHE particles, have the problems either with acceleration to the observed energies or with the fluxes and spectra.
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Simulation of the Isotropic Ultra-High Energy Photon Flux in the Solar Magnetic Field
Universe, 2022 Both the lack of observation of ultra-high energy (UHE) photons and the limitations of the state-of-the-art methodology being applied for their identification motivate studies on alternative approaches to the relevant simulations and the related ...
Bożena Poncyljusz +19 more
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Ultra high energy cosmic ray neutrinos
Physics Letters B, 1983 Abstract Neutrinos, produced by the collisions of ultra high energy cosmic rays and the 3 K background radiation, require careful treatment of the evolving cosmic ray spectrum. The resulting neutrino differential energy spectrum is flat up to energies of order 10 19 eV, thus most events are expected at this energy.
Christopher T. HILL, David N. SCHRAMM
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Galactic Ultra-High-Energy Cosmic Rays [PDF]
, 1999 4 pages, 1 figure, to appear in the Proceedings of the 26th ICRC ...
Angela V. Olinto +2 more
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ULTRA–HIGH-ENERGY COSMIC RAYS [PDF]
Lepton and Photon Interactions at High Energies, 2006 One of the most striking astrophysical phenomena today is the existence of cosmic ray particles with energies in excess of 1020 eV. While their presence has been confirmed by a number of experiments, it is not clear where and how these particles are accelerated to these energies and how they travel astronomical distances without substantial energy ...
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