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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Energy spectrum and chemical composition of cosmic rays
 Šalko, Jakub ; Nosek, Dalibor (advisor) ; Vícha, Jakub (referee)
A combined analysis of the energy spectrum and the chemical composition of ultra-high energy cosmic rays in the energy range from 1017.55 to 1019.25 eV ob- served by Pierre Auger Observatory is presented. Six different sets of primaries are considered with allowed particle fractions being determined by provided cal- culations. These calculations are based on simple assumptions about the energy spectra of primary particles and the evolution of the depth of shower maximum with energy. A simple power-law behaviour of particle spectra proved to be in- sufficient for describing the ankle in the observed all-particle energy spectrum. Assuming a broken power-law behaviour is able to reconstruct the observed all- particle energy spectrum with its ankle and the mean of the depth of shower maximum data with its break in each considered set. Including the spread of the depth of the shower maximum into calculations as quality checks suggest that provided calculations do not satisfy all relevant observables linked with chemical composition. 1
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Parameters sensitive to the mass composition of cosmic rays and their application at the Pierre Auger Observatory
 Vícha, Jakub
The Pierre Auger Observatory studies extensive cosmic ray showers of energy above 1018 eV. The mass composition of the shower–inducing primary particles plays an important role in the search for an anisotropy of their arrival directions and in considerations about the possible mechanisms of their acceleration. Several air shower parameters carrying information about the mass of primary cosmic ray are introduced and their applications to data of the Pierre Auger Observatory are discussed.
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