We report a study of the distributions of the depth of maximum, X-max, of extensive air-shower profiles with energies above 10(17.8) eV as observed with the fluorescence telescopes of the Pierre Auger Observatory. The analysis method for selecting a data sample with minimal sampling bias is described in detail as well as the experimental cross-checks and systematic uncertainties. Furthermore, we discuss the detector acceptance and the resolution of the X-max measurement and provide parametrizations thereof as a function of energy. The energy dependence of the mean and standard deviation of the X-max distributions are compared to air-shower simulations for different nuclear primaries and interpreted in terms of the mean and variance of the logarithmic mass distribution at the top of the atmosphere.

Aab, A., Abreu, P., Aglietta, M., Ahn, E., Al Samarai, I., Albuquerque, I., et al. (2014). Depth of maximum of air-shower profiles at the Pierre Auger Observatory. I. Measurements at energies above 1017.8eV. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 90(12) [10.1103/PhysRevD.90.122005].

Depth of maximum of air-shower profiles at the Pierre Auger Observatory. I. Measurements at energies above 1017.8eV

PRIVITERA, PAOLO;
2014-01-01

Abstract

We report a study of the distributions of the depth of maximum, X-max, of extensive air-shower profiles with energies above 10(17.8) eV as observed with the fluorescence telescopes of the Pierre Auger Observatory. The analysis method for selecting a data sample with minimal sampling bias is described in detail as well as the experimental cross-checks and systematic uncertainties. Furthermore, we discuss the detector acceptance and the resolution of the X-max measurement and provide parametrizations thereof as a function of energy. The energy dependence of the mean and standard deviation of the X-max distributions are compared to air-shower simulations for different nuclear primaries and interpreted in terms of the mean and variance of the logarithmic mass distribution at the top of the atmosphere.
2014
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/01 - FISICA SPERIMENTALE
English
Con Impact Factor ISI
Aab, A., Abreu, P., Aglietta, M., Ahn, E., Al Samarai, I., Albuquerque, I., et al. (2014). Depth of maximum of air-shower profiles at the Pierre Auger Observatory. I. Measurements at energies above 1017.8eV. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 90(12) [10.1103/PhysRevD.90.122005].
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