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Título

Measurement of the Depth of Maximum of Extensive Air Showers above 10(18) eV

AutorPIERRE AUGER Collaboration; Pastor, Sergio ; Abraham, J.; Abreu, P.
Fecha de publicación5-mar-2010
EditorAmerican Physical Society
CitaciónPhysical Review Letters 104 (9): 091101 (2010)
ResumenWe describe the measurement of the depth of maximum, X-max, of the longitudinal development of air showers induced by cosmic rays. Almost 4000 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 d24 +/- 3 g/cm(2)/ecade 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.
Versión del editorhttp://dx.doi.org/ 10.1103/PhysRevLett.104.091101
URIhttp://hdl.handle.net/10261/24500
DOI10.1103/PhysRevLett.104.091101
ISSN0031-9007
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