91. Reconstruction of inclined air showers detected with the Pierre Auger ObservatorySerguei Vorobiov, Samo Stanič, Danilo Zavrtanik, Darko Veberič, Andrej Filipčič, Marko Zavrtanik, A. Aab, 2014, original scientific article Keywords: kozmični žarki, mioni, Observatorij Pierre Auger Published in RUNG: 16.06.2016; Views: 4373; Downloads: 23 Link to full text |
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93. Cosmic ray composition studies with the Pierre Auger ObservatoryThomas Paul, Samo Stanič, Darko Veberič, Andrej Filipčič, Danilo Zavrtanik, Marko Zavrtanik, D. Boncioli, 2014, published scientific conference contribution Keywords: kozmični žarki, Observatorij Pierre Auger, kompozicija Published in RUNG: 16.06.2016; Views: 4080; Downloads: 16 Link to full text |
94. Measurement of the ultra high energy cosmic ray energy spectrum with the Pierre Auger ObservatoryDarko Veberič, Thomas Paul, Andrej Filipčič, Samo Stanič, Danilo Zavrtanik, Marko Zavrtanik, G. Rodriguez, 2014, published scientific conference contribution Keywords: kozmični žarki, Observatorij Pierre Auger, spekter Published in RUNG: 16.06.2016; Views: 3905; Downloads: 22 Link to full text |
95. Radio detection of extensive air showers at the Pierre Auger ObservatorySamo Stanič, Danilo Zavrtanik, Darko Veberič, Andrej Filipčič, Thomas Paul, Marko Zavrtanik, Jennifer Maller, 2014, published scientific conference contribution Keywords: kozmični žarki, Observatorij Pierre Auger, radijska detekcija Published in RUNG: 16.06.2016; Views: 3792; Downloads: 17 Link to full text |
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97. Searches for large-scale anisotropy in the arrival directions of cosmic rays detected above energy of 10 [sup] 19 eV at the Pierre Auger Observatory and the Telescope ArrayDarko Veberič, Samo Stanič, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, Andrej Filipčič, A. Aab, Ahmed Saleh, 2014, original scientific article Keywords: sferični harmoniki, anizotropije na velikih skalah, dipolni moment, kvadrupolni moment, Observatorij Pierre Auger, Observatorij Telescope Array Published in RUNG: 16.06.2016; Views: 4793; Downloads: 24 Link to full text |
98. Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger ObservatoryA. Aab, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Darko Veberič, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2016, original scientific article Abstract: The azimuthal asymmetry in the risetime of signals in Auger surface detector stations is a source of information on shower development. The azimuthal asymmetry is due to a combination of the longitudinal evolution of the shower and geometrical effects related to the angles of incidence of the particles into the detectors. The magnitude of the effect depends upon the zenith angle and state of development of the shower and thus provides a novel observable, (secθ)max, sensitive to the mass composition of cosmic rays above 3×1018 eV. By comparing measurements with predictions from shower simulations, we find for both of our adopted models of hadronic physics (QGSJETII-04 and EPOS-LHC) an indication that the mean cosmic-ray mass increases slowly with energy, as has been inferred from other studies. However, the mass estimates are dependent on the shower model and on the range of distance from the shower core selected. Thus the method has uncovered further deficiencies in our understanding of shower modeling that must be resolved before the mass composition can be inferred from (secθ)max. Keywords: ultra-high energy cosmic rays (UHECR), UHECR mass composition, Pierre Auger Observatory, extensive air showers, Auger Surface Detector signals risetime, azimuthal symmetry Published in RUNG: 15.04.2016; Views: 5479; Downloads: 0 This document has many files! More... |
99. Initial results of a direct comparison between the Surface Detectors of the Pierre Auger Observatory and the Telescope ArrayR. Takeishi, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Darko Veberič, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2015, published scientific conference contribution Abstract: The Pierre Auger Observatory (Auger) in Mendoza, Argentina and
the Telescope Array (TA) in Utah, USA aim at unraveling the
origin and nature of Ultra-High Energy Cosmic Rays (UHECR).
At present, there appear to be subtle differences between Auger
and TA results and interpretations. Joint working groups have
been established and have already reported preliminary
findings. From an experimental standpoint, the Surface
Detectors (SD) of both experiments make use of different
detection processes not equally sensitive to the components of
the extensive air showers making it to the ground. In particular, the muonic component of the shower measured at
ground level can be traced back to the primary composition,
which is critical for understanding the origin of UHECRs.
In order to make direct comparisons between the SD detection
techniques used by Auger and TA, a joint SD experimental
research program is being developed. In the first phase,
two Auger SD stations were deployed at the TA Central Laser
Facility to compare station-level responses. This paper
concentrates on the results obtained with the first Auger SD
station (an “Auger North” design), which has been operating
since October 2014. The second Auger SD station, identical to
the ones being operated at Auger in Argentina (an “Auger South”
design), was just deployed in June 2015. The second phase of
this research program will be to co-locate six Auger North SD
stations with TA stations in the field to compare event-level
responses. Keywords: Ultra-High Energy Cosmic Rays, Pierre Auger Observatory, Telescope Array, extensive air showers, secondary cosmic rays, muonic shower component, surface detectors Published in RUNG: 08.03.2016; Views: 4776; Downloads: 188 Full text (1,42 MB) |
100. Large-Scale Distribution of Arrival Directions of Cosmic Rays Detected at the Pierre Auger Observatory and the Telescope Array above 10[sup]19 eVOlivier Deligny, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Darko Veberič, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2015, published scientific conference contribution Abstract: The large-scale distribution of arrival directions of
high-energy cosmic rays is a key observable in attempts to
understanding their origin. The dipole and quadrupole moments
are of special interest in revealing potential anisotropies.
An unambiguous measurement of these moments as well as
of the full set of spherical harmonic coefficients requires
full-sky coverage. This can be achieved by combining data from
observatories located in both the northern and southern
hemispheres. To this end, a joint analysis using data recorded
at the Pierre Auger Observatory and the Telescope Array above
10[sup]19 eV has been performed. Thanks to the full-sky
coverage, the measurement of the dipole moment reported in
this study does not rely on any assumption on the underlying
flux of cosmic rays. As well, the resolution on the quadrupole
and higher order moments is the best ever obtained. The
resulting multipolar expansion of the flux of cosmic rays
allows a series of anisotropy searches to be performed,
and in particular to report on the first angular power
spectrum of cosmic rays. This allows a comprehensive
description of the angular distribution of cosmic rays
above 10[sup]19 eV. Keywords: Pierre Auger Observatory, Telescope Array, high-energy cosmic rays, large-scale anisotropies, angular power spectrum Published in RUNG: 08.03.2016; Views: 4533; Downloads: 189 Full text (462,61 KB) |