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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/5863

Title: Measurement of the Depth of Maximum of Extensive Air Showers above 1018 eV
Other Titles: Physical Review Letters
Authors: Abraham, J.
Abreu, P.
Aglietta, M.
Ahn, E. J.
Allard, D.
Allekotte, I.
Allen, J.
Pepe, Iuri Muniz
Issue Date: 5-Mar-2010
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.
Description: p. 1-7
URI: http://www.repositorio.ufba.br/ri/handle/ri/5863
ISSN: 0031-9007
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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