|
|
Measurement of the energy spectrum of cosmic rays using Cherenkov-dominated data at the Pierre Auger Observatory
Novotný, Vladimír ; Nosek, Dalibor (vedoucí práce)
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
|
|
|
Measurement of the energy spectrum of cosmic rays using Cherenkov-dominated data at the Pierre Auger Observatory
Novotný, Vladimír ; Nosek, Dalibor (vedoucí práce)
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
|
|
|
Measurement of the energy spectrum of cosmic rays using Cherenkov-dominated data at the Pierre Auger Observatory
Novotný, Vladimír ; Nosek, Dalibor (vedoucí práce) ; Spousta, Martin (oponent) ; Šmída, Radomír (oponent)
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
|
|
|
Energy spectrum and chemical composition of cosmic rays
Šalko, Jakub ; Nosek, Dalibor (vedoucí práce) ; Vícha, Jakub (oponent)
V tejto práci je prezentovaná kombinovaná analýza energetického spektra a che- mického zloženia vysokoenergetického kozmického žiarenia v rozmedzí energií od 1017.55 do 1019.25 eV pozorovaného pomocou Observatória Pierra Augera. Bolo uvažovaných šest' skupín primárnych častíc, v rámci ktorých bolo výpočtami určované povolené relatívne zastúpenie jednotlivých častíc. Tieto výpočty boli založené na jednoduchých predpokladoch o energetickom spektre jednotlivých primárnych častíc a vývoja h'lbky maxima sp'ršky s energiou. Jednoduché moc- ninné spektrum primárnych častíc nedokázalo popísat' členok v pozorovanom energetickom spektre. Lomené mocninné spektrum je schopné v každej skupine primárnych častíc popísat' pozorované spektrum so svojim členkom, ako aj stredné hodnoty h'lbok maxima sp'ršok s pozorovaným zlomom. Zahrnutie odchýlok h'lbok maxima sp'ršok ako kontrola kvality výpočtov naznačuje, že uskutočnené výpočty dostatočne nepopisujú všetky dôležité pozorovatel'né veličiny spojené s chemickým zložením kozmického žiarenia. 1
|
host ::
RSS.