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

0464049 - FZÚ 2021 RIV US eng J - Journal Article
Aab, A. - Abreu, P. - Aglietta, M. - Blažek, Jiří - Boháčová, Martina - Chudoba, Jiří - Ebr, Jan - Mandát, Dušan - Nečesal, Petr - Palatka, Miroslav - Pech, Miroslav - Prouza, Michael - Řídký, Jan - Schovánek, Petr - Trávníček, Petr - Vícha, Jakub … Total 434 authors
Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory.
Physical Review D. Roč. 93, č. 7 (2016), s. 1-16, č. článku 072006. ISSN 2470-0010. E-ISSN 2470-0029
R&D Projects: GA MŠMT(CZ) LG13007; GA MŠMT(CZ) 7AMB14AR005; GA ČR(CZ) GA14-17501S; GA MŠMT LM2015038
Institutional support: RVO:68378271
Keywords : Pierre Auger Observatory * cosmic rays * surface detector
OECD category: Particles and field physics
Impact factor: 4.557, year: 2016
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevD.93.072006

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, (sec theta)(max), sensitive to the mass composition of cosmic rays above 3 x 10(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 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.

Permanent Link: http://hdl.handle.net/11104/0263115