39 research outputs found

    Observation of the Ankle and Evidence for a High-Energy Break in the Cosmic Ray Spectrum

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    We have measured the cosmic ray spectrum at energies above 101710^{17} eV using the two air fluorescence detectors of the High Resolution Fly's Eye experiment operating in monocular mode. We describe the detector, PMT and atmospheric calibrations, and the analysis techniques for the two detectors. We fit the spectrum to models describing galactic and extragalactic sources. Our measured spectrum gives an observation of a feature known as the ``ankle'' near 3×10183\times 10^{18} eV, and strong evidence for a suppression near 6×10196\times 10^{19} eV.Comment: 14 pages, 9 figures. To appear in Physics Letters B. Accepted versio

    ATLAS detector and physics performance: Technical Design Report, 1

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    Cosmic ray radiation effects on space environment associated to intense solar and geomagnetic activity

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    Intense cosmic ray fluxes during Forbush decreases can be responsible for a number of radiation effects in electronics and sensor systems of spacecrafts and aircrafts. Monitoring, modeling and possible prediction, from the real-time database of the Athens Neutron Monitor Data Processing (ANMODAP) Center are being considered. A different kind of cosmic ray events that evolves during a Forbush decrease, as an additional intermediate enhancement and its impact on electronic systems, is also identified. © 2007 IEEE
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