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|Title: ||Depth of maximum of air-shower profiles at the Pierre Auger Observatory. I. Measurements at energies above 1017.8 eV|
|Other Titles: ||Physical Review -Series d-|
|Authors: ||Abreu, P.|
Ahn, E. J.
Samarai, I. Al
Albuquerque, Ivone Freire da Mota e
Pepe, Iuri Muniz
|Issue Date: ||2014|
|Abstract: ||We report a study of the distributions of the depth of maximum, Xmax, of extensive air-shower profiles with energies above 1017.8 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 Xmax measurement and provide parametrizations thereof as a function of energy. The energy dependence of the mean and standard deviation of the Xmax 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.|
|Appears in Collections:||Artigos Publicados em Periódicos (FIS)|
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