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 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
2016-04-15 10:38:25
1033
r6
A.
Aab
70
Andrej
Filipčič
70
Gašper
Kukec Mezek
70
Ahmed
Saleh
70
Samo
Stanič
70
Marta
Trini
70
Darko
Veberič
70
Serguei
Vorobiov
70
Lili
Yang
70
Danilo
Zavrtanik
70
Marko
Zavrtanik
70
COBISS_ID
3
4244731
NUK URN
18
URN:SI:UNG:REP:GU0NOLEJ
PhysRevD.93.072006.pdf
714943
Predstavitvena datoteka
2016-04-15 10:41:12
0
Izvorni URL
2016-04-15 10:40:54
0
Izvorni URL
2016-04-15 10:40:54