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Type: Journal article
Title: Measurement of the depth of maximum of extensive air showers above 10¹⁸ eV
Other Titles: Measurement of the depth of maximum of extensive air showers above 10(18) eV
Author: Barber, K.
Cooper, M.
Dawson, B.
Holmes, V.
Citation: Physical Review Letters, 2010; 104(9):091101-1-091101-7
Publisher: American Physical Soc
Issue Date: 2010
ISSN: 0031-9007
Statement of
J. Abraham... K. B. Barber... M. J. Cooper... B. R. Dawson... V. C. Holmes... et al.(Pierre Auger Collaboration)
Abstract: We describe the measurement of the depth of maximum, Xmax, of the longitudinal development of air showers induced by cosmic rays. Almost 4000 events above 10¹⁸ 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 (106-₂₁⁺³⁵)  g/cm2/decade below 10¹⁸.²⁴±⁰.⁰⁵  eV, and (24±3)  g/cm²/decade above this energy. The measured shower-to-shower fluctuations decrease from about 55 to 26  g/cm². The interpretation of these results in terms of the cosmic ray mass composition is briefly discussed.
Keywords: Pierre Auger Collaboration
Rights: ©2010 American Physical Society
RMID: 0020095518
DOI: 10.1103/PhysRevLett.104.091101
Appears in Collections:Physics publications

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