IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Estimating the Depth of Shower Maximum using the Surface Detectors of the Pierre Auger Observatory
Autor/es:
C. J. TODERO PEIXOTO; S. J. SCIUTTO; THE PIERRE AUGER COLLABORATION.
Lugar:
Madison
Reunión:
Conferencia; 36th International Cosmic Ray Conference; 2019
Resumen:
The Pierre Auger Collaboration has developed a method for estimating the depth of shower maximum(Xmax) using the risetime of the signals recorded by the array of water-Cherenkov detectors.The average value of Xmax is determined for energies above 3 EeV, using air showers with zenithangles up to 60. The work described here considerably extends that reported previously with anincrease in the total number of events by a factor 2.1. In total 125,005 events are used, of which237 are above 50 EeV. The data set is approximately a factor 30 larger than what is available fromfluorescence measurements for energies above 3 EeV. The results reinforce previous conclusions:the mean mass of high-energy cosmic rays begins to rise above 3 EeV and extend that findingto higher energies with greater precision. Additionally, we find strong discrepancies when wemake a comparison between observations and predictions from simulations with values which areobtained from measurements of the risetime of the recorded signals.