Oct 8 – 12, 2018
Ecole Supérieure de Chimie, Paris
Europe/Paris timezone

Estimates of the Cosmic-Ray Composition with the Pierre Auger Observatory

Oct 9, 2018, 9:30 AM
Friedel Amphitheater (Ecole Supérieure de Chimie, Paris)

Friedel Amphitheater

Ecole Supérieure de Chimie, Paris

Chimie ParisTech École Nationale Supérieure de Chimie de Paris 11, rue Pierre et Marie Curie 75231 PARIS Cedex 05
INVITED Sessions


Michael Unger (KIT)


We present measurements from the Pierre Auger Observatory related to
mass composition of ultra-high energy cosmic rays.

Using the fluorescence telescopes of the Observatory we determine the
distribution of shower maxima (Xmax) from 10^17.2 to 10^19.6 eV and
derive estimates of the mean and variance of the average logarithmic
mass of cosmic rays. The fraction of p, He, N and Fe nuclei as a
function of energy is derived by fitting the Xmax distribution with
templates from air shower simulations using the most recent version of
LHC-tuned hadronic interaction models.

Furthermore, we will discuss the analysis of the time structure of the
signals from air showers recorded with the water-Cherenkov detectors
to study the mass composition from 10^17.5 to 10^20 eV.

Primary author


Presentation materials