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Interpretation of the depths of maximum of extensive air showers measured by the Pierre Auger Observatory

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Interpretation of the depths of maximum of extensive air showers measured by the Pierre Auger Observatory

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The Pierre Auger Collaboration; Arqueros Martínez, Fernando; Gascón Bravo, Alberto; Minaya Flores, Ignacio Andrés; Pastor Carpi, Sergio; Rosado Vélez, Jaime; Vázquez Peñas, José Ramón; Zamorano García, Bruno

Aquest document és un/a article, creat/da en: 2013

Este documento está disponible también en : 10.1088/1475-7516/2013/02/026

To interpret the mean depth of cosmic ray air shower maximum and its dispersion, we parametrize those two observables as functions of the first two moments of the ln A distribution. We examine the goodness of this simple method through simulations of test mass distributions. The application of the parameterization to Pierre Auger Observatory data allows one to study the energy dependence of the mean ln A and of its variance under the assumption of selected hadronic interaction models. We discuss possible implications of these dependences in term of interaction models and astrophysical cosmic ray sources.

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