| Title: | Azimuthal asymmetry in the risetime of the Surface Detector signals of the Pierre Auger Observatory |
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| Authors: | ID Minaya, Ignacio (Author)
ID Filipčič, Andrej (Author)
ID Kukec Mezek, Gašper (Author)
ID Saleh, Ahmed (Author)
ID Stanič, Samo (Author)
ID Trini, Marta (Author)
ID Veberič, Darko (Author)
ID Vorobiov, Serguei (Author)
ID Yang, Lili (Author)
ID Zavrtanik, Danilo (Author)
ID Zavrtanik, Marko (Author), et al. |
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| Files: |  ICRC2015_405.pdf (243,04 KB)
MD5: 061D4079F2C2B0599DBA36D9D6C3ED7C
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.08 - Published Scientific Conference Contribution |
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| Organization: | UNG - University of Nova Gorica
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| 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 sensitive to the mass
composition of cosmic rays above 3 × 10[sup]18 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 with energy, as has been inferred from other studies.
However the absolute values derived for the mass 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 modelling that must
be resolved before the mass composition can be inferred from
(sec θ)max. |
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| Keywords: | Pierre Auger Observatory, Surface Detector, risetime of detector signal, azimuthal asymmetry, extensive air showers |
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| Publication status: | Published |
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| Year of publishing: | 2015 |
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| PID: | 20.500.12556/RUNG-2139  |
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| COBISS.SI-ID: | 4152059 |
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| NUK URN: | URN:SI:UNG:REP:HPN0CWEH |
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| Publication date in RUNG: | 03.03.2016 |
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| Views: | 4688 |
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| Downloads: | 196 |
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