The profile of the longitudinal development of showers produced by ultra-highenergy cosmic rays carries information related to the interaction properties ofthe primary particles with atmospheric nuclei. In this work, we present thefirst measurement of the average shower profile in traversed atmospheric depthat the Pierre Auger Observatory. The shapes of profiles are well reproduced bythe Gaisser-Hillas parametrization within the range studied, for E > 10^17.8eV. A detailed analysis of the systematic uncertainties is performed using 10years of data and a full detector simulation. The average shape is quantifiedusing two variables related to the width and asymmetry of the profile, and theresults are compared with predictions of hadronic interaction models fordifferent primary particles.
Measurement of the average shape of longitudinal profiles of cosmic-ray air showers at the Pierre Auger Observatory
C. Aramo;A. Blanco;C. Bonifazi;M. Buscemi;F. Canfora;R. Caruso;B. García;A. Insolia;D. Lo Presti;L. Perrone;V. Pirronello;F. Zuccarello
2019-01-01
Abstract
The profile of the longitudinal development of showers produced by ultra-highenergy cosmic rays carries information related to the interaction properties ofthe primary particles with atmospheric nuclei. In this work, we present thefirst measurement of the average shower profile in traversed atmospheric depthat the Pierre Auger Observatory. The shapes of profiles are well reproduced bythe Gaisser-Hillas parametrization within the range studied, for E > 10^17.8eV. A detailed analysis of the systematic uncertainties is performed using 10years of data and a full detector simulation. The average shape is quantifiedusing two variables related to the width and asymmetry of the profile, and theresults are compared with predictions of hadronic interaction models fordifferent primary particles.| File | Dimensione | Formato | |
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