Results 21 to 30 of about 22,727 (221)
On the acceleration of ultra-high-energy cosmic rays [PDF]
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2008 Ultra-high-energy cosmic rays (UHECRs) hit the Earth's atmosphere with energies exceeding 10 18 eV. This is the same energy as carried by a tennis ball moving at 100 km h −1 , but concentrated on a subatomic particle.
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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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Detection of ultra-high energy cosmic ray air showers by Cosmic Ray Air Fluorescence Fresnel lens Telescope for next generation [PDF]
EPJ Web of Conferences, 2019 In the future, ultra-high energy cosmic ray (UHECR) observatory will be expanded due to the small flux. Then, cost reduction is useful strategy to realize a huge scale observatory.
Tameda Yuichiro +7 more
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The intergalactic propagation of ultra-high energy cosmic ray nuclei [PDF]
, 2006 We investigate the propagation of ultra-high energy cosmic ray nuclei (A = 1-56) from cosmologically distant sources through the cosmic radiation backgrounds. Various models for the injected composition and spectrum and of the cosmic infra-red background
Taylor, Andrew M. +5 more
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Ultra–High Energy Cosmic Rays: Are They Isotropic? [PDF]
The Astrophysical Journal, 2001 From the analysis of AGASA data above $4 \times 10^{19}$ eV, we show that the ultra-high energy cosmic rays flux is neither purely isotropic, nor reflects the expected anisotropy from a pure source distribution that maps large scale structure in the local universe.
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Ultra high energy cosmic rays and inflation [PDF]
Second international workshop on particle physics and the early universe (COSMO-98), 1999 Two processes of matter creation after inflation: 1) gravitational creation of superheavy (quasi)stable particles, and 2) non-thermal phase transitions leading to formation of topological defects, may be relevant to the resolution of the puzzle of cosmic rays observed with energies beyond GZK cut-off. Both possibilities are reviewed in this talk.
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Cosmic ray contribution in extragalactic background gamma-ray emission at an energy of 0.1 TeV
EPJ Web of Conferences, 2017 We estimate the intensity of gamma-quanta at the energy 0.1 TeV that is generated in extragalactic space in interactions of ultra-high energy cosmic rays with the cosmic background emission.
Uryson Anna
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Measurements of very-forward energy with the CASTOR calorimeter of CMS [PDF]
EPJ Web of Conferences, 2019 The very-forward energy production in hadron collisions is of paramount importance for the understanding of ultra-high energy cosmic ray air showers. The CASTOR calorimeter of CMS is located at -6:6 < η < -5:2 in the phase-space where the peak of energy ...
Baur Sebastian
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Multi-messenger studies with the Pierre Auger Observatory [PDF]
EPJ Web of Conferences, 2023 The combination of data from observatories measuring ultra-high energy cosmic rays, photons, neutrinos and gravitational waves has provided new insights into the most extreme phenomena in the Universe.
Perrone Lorenzo
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Cosmic rays at ultra high energies (Neutrinos!)
Astroparticle Physics, 2006 Resonant photopion production with the cosmic microwave background predicts a suppression of extragalactic protons above the famous Greisen-Zatsepin-Kuzmin cutoff at about E_{GZK} ~ 5 x 10^10 GeV. Current cosmic ray data measured by the AGASA and HiRes Collaborations do not unambiguously confirm the GZK cutoff and leave a window for speculations about ...
Ahlers, Markus +2 more
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