Results 191 to 200 of about 3,083 (223)
Reviews of Modern Physics, 2011 Proceedings of the XXXI PHYSICS IN COLLISION, Vancouver, BC Canada, August 28 - September 1, 2011; 9 pages with 8 ...
Todor Stanev
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Physics and High Technology, 2018
The origin of ultra-high energy cosmic rays (UHECRs) is a long-standing mystery in astrophysics. Two collaborations are running experiments, the Telescope Array in the northern hemisphere and the Pierre Auger Observatory in the southern hemisphere, recording the signals coming from the extensive air showers made by the most energetic particles observed
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The origin of ultra-high energy cosmic rays (UHECRs) is a long-standing mystery in astrophysics. Two collaborations are running experiments, the Telescope Array in the northern hemisphere and the Pierre Auger Observatory in the southern hemisphere, recording the signals coming from the extensive air showers made by the most energetic particles observed
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Journal of Physics G: Nuclear and Particle Physics, 2007
Despite detailed examination and discussion there is still argument about the cosmic ray (CR) particle energy which marks the dividing line between particles primarily of galactic energy and those of extragalactic origin. Our own view (e.g. Wibig and Wolfendale 2005 J. Phys. G: Nucl. Part. Phys.
Tadeusz Wibig, Arnold W Wolfendale
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Despite detailed examination and discussion there is still argument about the cosmic ray (CR) particle energy which marks the dividing line between particles primarily of galactic energy and those of extragalactic origin. Our own view (e.g. Wibig and Wolfendale 2005 J. Phys. G: Nucl. Part. Phys.
Tadeusz Wibig, Arnold W Wolfendale
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Contemporary Physics, 2010
Ultra High Energy Cosmic Rays (UHECRs) represent the most energetic source of elementary particles available to scientists. They have macroscopic energies, exceeding 5 × 1019 eV, and as yet unidentified sources. Unfortunately, their flux is as low as one particle per century per square kilometre, requiring dedicated detectors with huge apertures to ...
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Ultra High Energy Cosmic Rays (UHECRs) represent the most energetic source of elementary particles available to scientists. They have macroscopic energies, exceeding 5 × 1019 eV, and as yet unidentified sources. Unfortunately, their flux is as low as one particle per century per square kilometre, requiring dedicated detectors with huge apertures to ...
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Nuclear Physics B - Proceedings Supplements, 2001
Abstract The evidence for the existence of cosmic rays with energies in excess of 1020 eV is now overwhelming. There is so far no indication of the GZK cutoff in the energy spectrum at 5 × 1019 eV. This conclusion is not firm for lack of statistics. A cutoff would be expected if the sources of the cosmic rays were distributed uniformly throughout the
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Abstract The evidence for the existence of cosmic rays with energies in excess of 1020 eV is now overwhelming. There is so far no indication of the GZK cutoff in the energy spectrum at 5 × 1019 eV. This conclusion is not firm for lack of statistics. A cutoff would be expected if the sources of the cosmic rays were distributed uniformly throughout the
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Ultra-high-energy cosmic rays from superconducting cosmic strings
Physical Review D, 1987Superconducting cosmic strings may play an important role in the relatively late Universe in formation of structure and in driving highly exoergic processes. With fermionic charge carriers they are expected to eject, in their last stages, high-mass particles which can subsequently decay to produce ultra-high-energy electromagnetic, neutrino, and ...
, Hill, , Schramm, , Walker
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Cosmic rays of ultra-high energy
Contemporary Physics, 1981Abstract There falls on the Earth's atmosphere a rain of particles and photons the high energy part of which is termed the Cosmic Radiation. This article is concerned specifically with primary particles of the highest known energies, i.e. 1017-1020eV and deals with the evidence for their existence, their nature and their origin. Such particles are very
G. D. Rochester, K. E. Turver
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Ultra High Energy Cosmic Rays: Strangelets?
Chinese Physics Letters, 2003The conjecture that ultra-high-energy cosmic rays (UHECRs) are actually strangelets is discussed. Besides the reason that strangelets can do as cosmic rays beyond the Greisen-Zatsepin-Kuzmin-cutoff, another argument to support the conjecture is addressed by the study of formation of TeV-scale microscopic black holes when UHECRs bombarding bare strange ...
Xu Ren-Xin, Wu Fei
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Ultra high energy cosmic rays and ultra high energy γ-rays
Advances in Space Research, 1984Abstract Evidence on the energy spectrum, mass composition and anisotropy of cosmic rays above 10 14 eV is briefly surveyed and it is shown that the data are consistent with all cosmic rays below 10 19 eV being of galactic origin. Results from the new field of γ-ray astronomy above 10 15 eV are described and implications for the origin of cosmic ...
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1983
The interpretation of observations on cosmic rays above 1015 eV is discussed in simple terms, without considering detailed models. The variation of the amplitude of anisotropy with energy (compared with a “leaky box” picture) and the anisotropy in galactic latitude (indicating a local density gradient) strongly suggest a galactic origin for particles ...
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The interpretation of observations on cosmic rays above 1015 eV is discussed in simple terms, without considering detailed models. The variation of the amplitude of anisotropy with energy (compared with a “leaky box” picture) and the anisotropy in galactic latitude (indicating a local density gradient) strongly suggest a galactic origin for particles ...
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