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- W837752444 abstract "The Pierre Auger Observatory is exploring the mysteries of the highest-energy cosmic rays. This experiment was conceived more than ten years ago to explore the properties of the most energetic cosmic rays such as the flux, arrival direction distribution and mass composition, with high statistical significance and covering the whole sky.A few years after Penzias and Wilson established the existence of the cosmic microwave background with a mean temperature of 2.7 K , Greisen, Zatsepin and Kuzmin predicted that a cutoff of the cosmic ray flux at the highest energies is expected due to the interaction of the ultra high energy cosmic rays with the cosmic microwave background photons.Before the Pierre Auger Observatory the AGASA and Hires experiments have obtained differents results about this cutoff. Those experiments use different detection techniques. The Auger experiment is an “hybrid” detector in the sense that uses for the first time both techniques. It consists of two complementary detectors designed to observe, in coincidence, the shower of particles which can be spread along several kilometres when they reach the earth surface. A Surface Detector (SD) composed of 1600 Cherenkov stations samples the front of the shower at ground. A Fluorescence Detector (FD) equipped with 24 telescopes collects the fluorescence light emitted by atmospheric nitrogen molecules excited as the shower is crossing the atmosphere. The FD measure the longitudinal profile of the shower.The Southern Observatory in Argentina near the Malargue village was completed in May 2008 and inaugurated in November 2008. It is taking data in stable manner since January 2004. During this time the experiment has accumulated an unprecedented statistics and the first results are pubblished.The Northern Observatory will be built in Colorado, USA. Both observatories allow a full sky coverage. The main objective of this thesis is the measurement of the cosmic ray energy spectrum above 3 EeV based on the data recorded at the Pierre Auger Observatory." @default.
- W837752444 created "2016-06-24" @default.
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- W837752444 date "2009-05-04" @default.
- W837752444 modified "2023-09-25" @default.
- W837752444 title "The cosmic rays flux from the Pierre Auger Observatory data" @default.
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