Measurement of the average shape of longitudinal profiles of cosmic ray air-showers at the Pierre Auger Observatory

THE PIERRE AUGER COLLABORATION (P.HANSEN PERTENECE A LA COLABORACION-ORDEN ALFABETICO)

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS

IOP PUBLISHING LTD

Lugar: Londres; Año: 2019 vol. 18 p. 1 - 20

1475-7516

The prole of the longitudinal development of showers produced by ultra-highenergy cosmic rays carries information related to the interaction properties of the primaryparticles with atmospheric nuclei. In this work, we present the rst measurement of theaverage shower prole in traversed atmospheric depth at the Pierre Auger Observatory. Theshapes of proles are well reproduced by the Gaisser-Hillas parametrization within the rangestudied, for E > 1017:8 eV. A detailed analysis of the systematic uncertainties is performedusing ten years of data and a full detector simulation. The average shape is quantied usingtwo variables related to the width and asymmetry of the prole, and the results are comparedwith predictions of hadronic interaction models for dierent primary particles.