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- Ultra-high-energy_cosmic_ray abstract "In astroparticle physics, an ultra-high-energy cosmic ray (UHECR) is a cosmic ray particle with a kinetic energy greater than 1018 eV, far beyond both its rest mass and energies typical of other cosmic ray particles.An extreme-energy cosmic ray (EECR) is an UHECR with energy exceeding 5×1019 eV (about 8 Joule), the so-called Greisen–Zatsepin–Kuzmin limit (GZK limit).These particles are extremely rare, the total number of observed events between 1962 and the completion of Pierre Auger Observatory (PAO) in 2008 ranging at a few dozen at the most. The PAO is designed to survey an area of some 3000 km2 and expects to see maybe one such particle every one or two weeks. During the phasing in of its operation during 2004 to 2007, a total number of 27 events with estimated arrival energies above 5.7 1019 eV were reported.Ultra-high-energy particles are significant for astrophysics and fundamental physics theory, because they have energies comparable to the GZK limit, which occurs at about 5×1019 eV. This limit should be the maximum energy of cosmic ray particles that have traveled long distances (about 160 million light years), due to the theoretical energy losses of higher-energy ray particles and to scattering from photons in the cosmic microwave background. It follows that EECR could not be surviving from the early universe but are cosmologically "young", emitted somewhere in the Local Supercluster by some unknown physical process.The postulated (hypothetical) sources of EECR are known as Zevatrons, named in analogy to Lawrence Berkeley National Laboratory's Bevatron and Fermilab's Tevatron, and therefore capable of accelerating particles to 1 ZeV (1021 eV). In 2004 there was a consideration of the possibility of galactic jets acting as Zevatrons, due to diffusive acceleration of particles caused by shock waves inside the jets. In particular, models suggested that shock waves from the nearby M87 galactic jet could accelerate an iron nucleus to ZeV ranges. In 2007, PAO tentatively associated EECR with extragalactic supermassive black holes at the center of nearby galaxies called active galactic nuclei (AGN).A more speculative suggestion Grib and Pavlov (2007, 2008) envisages the decay of superheavy dark matter by means of the Penrose process.".
- Ultra-high-energy_cosmic_ray wikiPageExternalLink news-print.cfm?art=1509.
- Ultra-high-energy_cosmic_ray wikiPageExternalLink SEC10.
- Ultra-high-energy_cosmic_ray wikiPageExternalLink uhecrs.htm.
- Ultra-high-energy_cosmic_ray wikiPageExternalLink OhMyGodParticle.
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- Ultra-high-energy_cosmic_ray hasPhotoCollection Ultra-high-energy_cosmic_ray.
- Ultra-high-energy_cosmic_ray subject Category:Astroparticle_physics.
- Ultra-high-energy_cosmic_ray subject Category:Cosmic_rays.
- Ultra-high-energy_cosmic_ray subject Category:Particle_physics.
- Ultra-high-energy_cosmic_ray subject Category:Subatomic_particles.
- Ultra-high-energy_cosmic_ray subject Category:Unsolved_problems_in_astronomy.
- Ultra-high-energy_cosmic_ray type Body109224911.
- Ultra-high-energy_cosmic_ray type CosmicRay111441707.
- Ultra-high-energy_cosmic_ray type CosmicRays.
- Ultra-high-energy_cosmic_ray type Energy111452218.
- Ultra-high-energy_cosmic_ray type IonizingRadiation111437577.
- Ultra-high-energy_cosmic_ray type NaturalObject100019128.
- Ultra-high-energy_cosmic_ray type NaturalPhenomenon111408559.
- Ultra-high-energy_cosmic_ray type Object100002684.
- Ultra-high-energy_cosmic_ray type Particle109386422.
- Ultra-high-energy_cosmic_ray type Phenomenon100034213.
- Ultra-high-energy_cosmic_ray type PhysicalEntity100001930.
- Ultra-high-energy_cosmic_ray type PhysicalPhenomenon111419404.
- Ultra-high-energy_cosmic_ray type Process100029677.
- Ultra-high-energy_cosmic_ray type Radiation111499284.
- Ultra-high-energy_cosmic_ray type SubatomicParticles.
- Ultra-high-energy_cosmic_ray type Whole100003553.
- Ultra-high-energy_cosmic_ray comment "In astroparticle physics, an ultra-high-energy cosmic ray (UHECR) is a cosmic ray particle with a kinetic energy greater than 1018 eV, far beyond both its rest mass and energies typical of other cosmic ray particles.An extreme-energy cosmic ray (EECR) is an UHECR with energy exceeding 5×1019 eV (about 8 Joule), the so-called Greisen–Zatsepin–Kuzmin limit (GZK limit).These particles are extremely rare, the total number of observed events between 1962 and the completion of Pierre Auger Observatory (PAO) in 2008 ranging at a few dozen at the most. ".
- Ultra-high-energy_cosmic_ray label "Raggi cosmici ad altissima energia".
- Ultra-high-energy_cosmic_ray label "Ultra-high-energy cosmic ray".
- Ultra-high-energy_cosmic_ray label "Zetta-particule".
- Ultra-high-energy_cosmic_ray label "超高エネルギー宇宙線".
- Ultra-high-energy_cosmic_ray sameAs Zetta-particule.
- Ultra-high-energy_cosmic_ray sameAs Raggi_cosmici_ad_altissima_energia.
- Ultra-high-energy_cosmic_ray sameAs 超高エネルギー宇宙線.
- Ultra-high-energy_cosmic_ray sameAs m.02dxyf.
- Ultra-high-energy_cosmic_ray sameAs Q1770333.
- Ultra-high-energy_cosmic_ray sameAs Q1770333.
- Ultra-high-energy_cosmic_ray sameAs Ultra-high-energy_cosmic_ray.
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- Ultra-high-energy_cosmic_ray homepage SEC10.
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