Measurement of the Depth of Maximum of Extensive Air Showers above $10^{18}$ eV - INSPIRE

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Measurement of the Depth of Maximum of Extensive Air Showers above $10^{18}$ eV

Pierre Auger

Collaboration

Feb, 2010

7 pages

Published in:

Phys.Rev.Lett. 104 (2010) 091101

e-Print:

1002.0699 [astro-ph.HE]

DOI:

10.1103/PhysRevLett.104.091101

Report number:

FERMILAB-PUB-10-065-A-PPD

Experiments:

AUGER

View in:

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Abstract: (arXiv)

We describe the measurement of the depth of maximum, Xmax, of the longitudinal development of air showers induced by cosmic rays. Almost four thousand events above 10^18 eV observed by the fluorescence detector of the Pierre Auger Observatory in coincidence with at least one surface detector station are selected for the analysis. The average shower maximum was found to evolve with energy at a rate of (106 +35/-21) g/cm^2/decade below 10^(18.24 +/- 0.05) eV and (24 +/- 3) g/cm^2/decade above this energy. The measured shower-to-shower fluctuations decrease from about 55 to 26 g/cm^2. The interpretation of these results in terms of the cosmic ray mass composition is briefly discussed.

Note:

Accepted for publication by PRL

13.85.Tp
96.50.sd
98.70.Sa
96.50.sb
showers: air
detector: fluorescence
cosmic radiation: mass
detector: surface
experimental results
Auger

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