Depth of Maximum of Air-Shower Profiles at the Pierre Auger Observatory: Measurements at Energies above $10^{17.8}$ eV - INSPIRE

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Depth of Maximum of Air-Shower Profiles at the Pierre Auger Observatory: Measurements at Energies above $10^{17.8}$ eV

Pierre Auger

Collaboration

Sep 16, 2014

25 pages

Published in:

Phys.Rev.D 90 (2014) 12, 122005

Published: Dec 31, 2014

e-Print:

1409.4809 [astro-ph.HE]

DOI:

10.1103/PhysRevD.90.122005

Report number:

FERMILAB-PUB-14-348-AD-AE-CD-TD

Experiments:

AUGER

View in:

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Abstract: (APS)

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.

Note:

published version PRD

98.70.Sa
96.50.sd
96.50.S-
showers: atmosphere
detector: fluorescence
observatory
Auger
energy dependence
air
cosmic radiation: UHE

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