Results 141 to 150 of about 42,851 (177)
Extragalactic radiation and the ultra-high-energy cosmic-ray spectrum
Nature, 1989 The effect of extragalactic microwave and submillimeter-radiation fields on the ultrahigh-energy cosmic-ray spectrum is reexamined. It is found that the general characteristics of the spectrum can be derived from fairly simple analytical arguments. It is shown that the various spectral features obtained by numerical calculations can be explored by ...
F. W. Stecker
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Ultra-High Energy Cosmic Radiation: Current Issues and Future Prospects
AIP Conference Proceedings, 2010 We briefly review the current experimental and theoretical status of cosmic radiation above ∼1017 eV, including secondary neutrinos and gamma‐rays. We focus on questions related to chemical composition and sky distributions of these particles as well as on the location and nature of their sources.
G. Sigl +3 more
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The role of Cherenkov radiation in the detection of ultra-high-energy cosmic rays
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2005 A brief historical overview of the role of Cherenkov radiation in the detection of cosmic rays is given. A current application, the detection of ultra-high-energy cosmic rays with the Pierre Auger Observatory, is described.
Alan Watson
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Probing physics and astrophysics at extreme energies with ultra high energy cosmic radiation
AIP Conference Proceedings, 2001 The highest energy cosmic rays observed possess macroscopic energies and their origin is likely to be associated with the most energetic processes in the Universe. Their existence triggered a flurry of theoretical explanations ranging from conventional shock acceleration to particle physics beyond the Standard Model and processes taking place at the ...
G. Sigl
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Chekenkov radiation of broad atmospheric showers (BAS) and analysis of ultra-high energy cosmic rays
Soviet Physics Journal, 1986 A new method for analyzing BAS of cosmic rays is presented, along with calculation results.
Yu. A. Fomin, G. B. Christiansen
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Interaction of ultra-high energy cosmic rays with microwave background radiation
Astrophysics and Space Science, 1990 The formation of the ‘bump’ and the ‘black-body cutoff’ in the cosmic-ray (CR) spectrum arising from the π-meson photoproduction reaction in collisions of UHE CR protons with the microwave background radiation (MBR) is studied. A kinetic equation which describes CR proton propagation in the MBR with account of the catastrophic nature of the π-meson ...
F. Aharonian +2 more
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Probing interactions beyond the electroweak scale with ultra high energy cosmic radiation
AIP Conference Proceedings, 2001 We demonstrate how current and future data on ultra-high energy cosmic rays and neutrinos can be used to probe new interactions at energies not or hardly accessible in accelerator experiments of the near future. As a specific example we discuss the possibility that neutrinos attain new interactions in the TeV range in particle physics models involving ...
G. Sigl
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A limit to the rate of ultra high energy γ-rays in the primary cosmic radiation
Astroparticle Physics, 1996 Abstract An upper limit to the flux of Ultra High Energy (UHE) γ-rays in the primary cosmic radiation is obtained through the data of the electromagnetic and the muon detectors of the EAS-TOP Extensive Air Shower array (Campo Imperatore, National Gran Sasso Laboratories, atmospheric depth 810g cm−2). The search is performed by selecting Extensive Air
M. Aglietta +30 more
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