21. Measurement of the average electromagnetic longitudinal shower profile at the Pierre Auger ObservatoryFrancisco Diogo, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Darko Veberič, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2015, objavljeni znanstveni prispevek na konferenci Opis: In addition to the standard Xmax and energy, the longitudinal
profiles of extensive air showers contain some more interesting
information. For energies above 10[sup]17.8 eV, we present the
average profiles as a function of atmospheric depth measured
for the first time at the Pierre Auger Observatory. The profile
shapes for different energy ranges are all well reproduced by a
Gaisser-Hillas function within the range studied. A detailed
analysis of the systematic uncertainties is performed using
data and a full detector simulation, and the results are
compared with predictions of hadronic interaction models for different primaries.
Ključne besede: Pierre Auger Observatory, extensive air showers, longitudinal shower profile, Gaisser-Hillas finction
Objavljeno v RUNG: 03.03.2016; Ogledov: 4237; Prenosov: 188
 Celotno besedilo (684,20 KB) |
22. Measurements of Xmax above 10[sup]17 eV with the fluorescence detector of the Pierre Auger ObservatoryAlessio Porcelli, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Darko Veberič, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2015, objavljeni znanstveni prispevek na konferenci Opis: For the first time the Pierre Auger Collaboration
presents〈Xmax〉and σ(Xmax) measurements covering nearly three decades of energy. In this analysis we include
new Xmax data obtained with the High Elevation Auger
Telescopes (HEAT) enhancement. The HEAT telescopes cover
a field of view ranging from 30◦ to 60◦ of elevation and are
located next to one of the standard fluorescence detector sites
(Coihueco). The combination of the HEAT and Coihueco telescopes
covers a field of view from ∼2◦ up to ∼60◦ of elevation. Thus,
the combination can sample the longitudinal profile of nearby
lower energy showers, allowing us to extend the energy range
down to 10[sup]17 eV.
Ključne besede: extensive atmospheric showers, longitudinal shower profile, depth of the shower maximum, Pierre Auger Observatory
Objavljeno v RUNG: 03.03.2016; Ogledov: 5375; Prenosov: 236
Celotno besedilo (718,30 KB) |
23. Composition at the “ankle” measured by the Pierre Auger Observatory: pure or mixed?Alexey Yushkov, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Darko Veberič, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2015, objavljeni znanstveni prispevek na konferenci Opis: We report for the first time on the measurement of the
correlation between the depth of shower maximum and the signal
in water-Cherenkov stations for events reconstructed by both
the fluorescence and the surface detectors of the Pierre Auger Observatory. Such a correlated measurement is a unique feature
of a hybrid air-shower observatory and allows us to determine
the purity of the cosmic-ray composition. The observed
correlation in the energy range around the “ankle”
lg(E/eV) = 18.5−19.0 differs significantly from the expectations for pure beams, indicating that the primary composition in this range is mixed, unless the
hadronic interactions at these energies behave very
differently than in conventional, LHC-tuned event generators.
Ključne besede: ultra-high energy cosmic rays, elemental composition, depth of shower maximum, secondary cosmic rays, Pierre Auger Observatory
Objavljeno v RUNG: 02.03.2016; Ogledov: 5320; Prenosov: 238
Celotno besedilo (388,00 KB) |
