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Measurement of the energy spectrum of cosmic rays using Cherenkov-dominated data at the Pierre Auger Observatory
Novotný, Vladimír ; Nosek, Dalibor (advisor)
This thesis presents the energy spectrum of cosmic rays deduced from Cherenkov-dominated data measured by the fluorescence detector of the Pierre Auger Observatory. Cherenkov-dominated events, used in the energy spectrum analysis at the Observatory for the first time, enable to decrease the energy threshold for the spectrum measurement down to 1015.5 eV. This energy is more than one order of magnitude lower than in preceding studies. The fluorescence detector was originally designed to detect the fluorescence light generated by extensive air showers in a hybrid mode with the surface detector of the Pierre Auger Observatory. The reconstruction of events dom- inated by Cherenkov light is available due to a newly developed reconstruc- tion technique, the profile constrained geometry fit. Its implementation in the Pierre Auger Observatory software is documented. Aspects of the energy spectrum analysis are described. They consist of exposure calculations done with the use of extensive Monte Carlo simulations, unfolding of the detec- tor effects, and inferring the invisible energy correction in the energy region below 1017 eV. Systematic uncertainties of the measurement are estimated. 1
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Measurement of the energy spectrum of cosmic rays using Cherenkov-dominated data at the Pierre Auger Observatory
Novotný, Vladimír ; Nosek, Dalibor (advisor)
This thesis presents the energy spectrum of cosmic rays deduced from Cherenkov-dominated data measured by the fluorescence detector of the Pierre Auger Observatory. Cherenkov-dominated events, used in the energy spectrum analysis at the Observatory for the first time, enable to decrease the energy threshold for the spectrum measurement down to 1015.5 eV. This energy is more than one order of magnitude lower than in preceding studies. The fluorescence detector was originally designed to detect the fluorescence light generated by extensive air showers in a hybrid mode with the surface detector of the Pierre Auger Observatory. The reconstruction of events dom- inated by Cherenkov light is available due to a newly developed reconstruc- tion technique, the profile constrained geometry fit. Its implementation in the Pierre Auger Observatory software is documented. Aspects of the energy spectrum analysis are described. They consist of exposure calculations done with the use of extensive Monte Carlo simulations, unfolding of the detec- tor effects, and inferring the invisible energy correction in the energy region below 1017 eV. Systematic uncertainties of the measurement are estimated. 1
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Measurement of the energy spectrum of cosmic rays using Cherenkov-dominated data at the Pierre Auger Observatory
Novotný, Vladimír ; Nosek, Dalibor (advisor) ; Spousta, Martin (referee) ; Šmída, Radomír (referee)
This thesis presents the energy spectrum of cosmic rays deduced from Cherenkov-dominated data measured by the fluorescence detector of the Pierre Auger Observatory. Cherenkov-dominated events, used in the energy spectrum analysis at the Observatory for the first time, enable to decrease the energy threshold for the spectrum measurement down to 1015.5 eV. This energy is more than one order of magnitude lower than in preceding studies. The fluorescence detector was originally designed to detect the fluorescence light generated by extensive air showers in a hybrid mode with the surface detector of the Pierre Auger Observatory. The reconstruction of events dom- inated by Cherenkov light is available due to a newly developed reconstruc- tion technique, the profile constrained geometry fit. Its implementation in the Pierre Auger Observatory software is documented. Aspects of the energy spectrum analysis are described. They consist of exposure calculations done with the use of extensive Monte Carlo simulations, unfolding of the detec- tor effects, and inferring the invisible energy correction in the energy region below 1017 eV. Systematic uncertainties of the measurement are estimated. 1
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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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