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Title:Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory
Authors:Aab, A. (Author)
Filipčič, Andrej (Author)
Kukec Mezek, Gašper (Author)
Saleh, Ahmed (Author)
Stanič, Samo (Author)
Trini, Marta (Author)
Veberič, Darko (Author)
Vorobiov, Serguei (Author)
Yang, Lili (Author)
Zavrtanik, Danilo (Author)
Zavrtanik, Marko (Author)
et al.
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
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
Year of publishing:2016
Number of pages:16
Numbering:2016, vol. 93, str. 072006
COBISS_ID:4244731  Link is opened in a new window
URN:URN:SI:UNG:REP:GU0NOLEJ
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Record is a part of a journal

Title:Physical Review D
Publisher:American Physical Society
ISSN:1550-7998
Year of publishing:2016

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