Study of the nuclear mass composition of UHECR with the surface detectors of the Pierre Auger Observatory.

HERNAN WAHLBERG (EN REPRESENTACION DE LA COLABORACION PIERRE AUGER)

Lodz

Conferencia; 31st International Cosmic Ray Conference; 2009

University of Łódź, Department of High Energy Astrophysics and Department of Astrophysics

We investigate observables that can be measured with the water-Cherenkov detectors of the Pierre Auger Observatory. In particular we explore the use of the risetime of the signals in the detectors and the azimuthal features of the time distributions. A correlation of these observables with the position of shower maximum (Xmax}), as measured with the fluorescence telescopes, is obtained.