The distribution of shower maxima of UHECR air showers

THE PIERRE AUGER COLLABORATION (AUTOR 434 DE 474); M. TUEROS (COAUTOR)

Beijing

Conferencia; 32nd International Cosmic Ray Conference 2011; 2011

Institute of High Energy Physics, Chinese Academy of Sciences

We present the measurement of Xmax, the depth of the maximum of the longitudinal development of ultra high energy air showers, with the fluorescence detector of the Pierre Auger Observatory. After giving an update on the average and fluctuations of Xmax with 80% more data than previously published, we discuss the distributions of Xmax for different energies and compare it to the predictions of air shower simulations for different primary particles.