Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory

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 partic...

Descripción completa

Detalles Bibliográficos
Autor principal: Multitudinario:434
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_15507998_v93_n7_p_Multitudinario
Aporte de:
id todo:paper_15507998_v93_n7_p_Multitudinario
record_format dspace
spelling todo:paper_15507998_v93_n7_p_Multitudinario2023-10-03T16:25:17Z Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory Multitudinario:434 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. © 2016 American Physical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15507998_v93_n7_p_Multitudinario
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description 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. © 2016 American Physical Society.
format JOUR
author Multitudinario:434
spellingShingle Multitudinario:434
Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory
author_facet Multitudinario:434
author_sort Multitudinario:434
title Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory
title_short Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory
title_full Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory
title_fullStr Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory
title_full_unstemmed Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory
title_sort azimuthal asymmetry in the risetime of the surface detector signals of the pierre auger observatory
url http://hdl.handle.net/20.500.12110/paper_15507998_v93_n7_p_Multitudinario
work_keys_str_mv AT multitudinario434 azimuthalasymmetryintherisetimeofthesurfacedetectorsignalsofthepierreaugerobservatory
_version_ 1807323485626695680