Measurement of the Depth of Maximum of Extensive Air Showers above 1018 eV

Abraham, J.; Abreu, P.; Aglietta, M.; Ahn, E. J.; Allard, D.; Allekotte, I.; Allen, J.; Pepe, Iuri Muniz

dc.contributor.author	Abraham, J.
dc.contributor.author	Abreu, P.
dc.contributor.author	Aglietta, M.
dc.contributor.author	Ahn, E. J.
dc.contributor.author	Allard, D.
dc.contributor.author	Allekotte, I.
dc.contributor.author	Allen, J.
dc.contributor.author	Pepe, Iuri Muniz
dc.creator	Abraham, J.
dc.creator	Abreu, P.
dc.creator	Aglietta, M.
dc.creator	Ahn, E. J.
dc.creator	Allard, D.
dc.creator	Allekotte, I.
dc.creator	Allen, J.
dc.creator	Pepe, Iuri Muniz
dc.date.accessioned	2012-05-14T20:35:36Z
dc.date.available	2012-05-14T20:35:36Z
dc.date.issued	2010-03-05
dc.identifier.issn	0031-9007
dc.identifier.uri	http://www.repositorio.ufba.br/ri/handle/ri/5863
dc.description	p. 1-7	pt_BR
dc.description.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.	pt_BR
dc.language.iso	en	pt_BR
dc.source	10.1103/PhysRevLett.104.091101	pt_BR
dc.title	Measurement of the Depth of Maximum of Extensive Air Showers above 1018 eV	pt_BR
dc.title.alternative	Physical Review Letters	pt_BR
dc.type	Artigo de Periódico	pt_BR
dc.identifier.number	v.104, n. 091101	pt_BR