Evidence For A Mixed Mass Composition At The 'ankle' In The Cosmic-ray Spectrum

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dc.date2016
dc.datenov
dc.date2017-11-13T13:57:16Z
dc.date2017-11-13T13:57:16Z
dc.date.accessioned2018-03-29T06:10:34Z
dc.date.available2018-03-29T06:10:34Z
dc.identifierPhysics Letters B. Elsevier Science Bv, v. 762, p. 288 - 295, 2016.
dc.identifier0370-2693
dc.identifier1873-2445
dc.identifierWOS:000388473700041
dc.identifier10.1016/j.physletb.2016.09.039
dc.identifierhttp://www-sciencedirect-com.ez88.periodicos.capes.gov.br/science/article/pii/S0370269316305433?via%3Dihub
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/329985
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1367010
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionWe report a first measurement for ultrahigh energy cosmic rays of the correlation between the depth of shower maximum and the signal in the water Cherenkov stations of air-showers registered simultaneously by the fluorescence and the surface detectors of the Pierre Auger Observatory. Such a correlation measurement is a unique feature of a hybrid air-shower observatory with sensitivity to both the electromagnetic and muonic components. It allows an accurate determination of the spread of primary masses in the cosmic-ray flux. Up till now, constraints on the spread of primary masses have been dominated by systematic uncertainties. The present correlation measurement is not affected by systematics in the measurement of the depth of shower maximum or the signal in the water Cherenkov stations. The analysis relies on general characteristics of air showers and is thus robust also with respect to uncertainties in hadronic event generators. The observed correlation in the energy range around the 'ankle' at lg(E/eV) = 18.5-19.0 differs significantly from expectations for pure primary cosmic-ray compositions. A light composition made up of proton and helium only is equally inconsistent with observations. The data are explained well by a mixed composition including nuclei with mass A > 4. Scenarios such as the proton dip model, with almost pure compositions, are thus disfavored as the sole explanation of the ultrahigh-energy cosmic-ray flux at Earth. (C) 2016 The Author(s). Published by Elsevier B.V.
dc.description762
dc.description288
dc.description295
dc.descriptionComision Nacional de Energia Atomica, Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCyT), Argentina
dc.descriptionConsejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET), Argentina
dc.descriptionGobierno de la Provincia de Mendoza, Argentina
dc.descriptionMunicipalidad de Malargue, Argentina
dc.descriptionNDM Holdings, Argentina
dc.descriptionValle Las Lenas, Argentina
dc.descriptionAustralian Research Council, Brazil
dc.descriptionConselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Brazil
dc.descriptionFinanciadora de Estudos e Projetos (FINEP), Brazil
dc.descriptionFundacao de Amparo a Pesquisa do Estado de Rio de Janeiro (FAPERJ), Brazil
dc.descriptionSao Paulo Research Foundation (FAPESP), Brazil [2010/07359-6, 1999/05404-3]
dc.descriptionMinisterio de Ciencia e Tecnologia (MCT), Brazil
dc.descriptionCzech Science Foundation, Czech Republic [14-17501S]
dc.descriptionCentre de Calcul IN2P3/CNRS, France
dc.descriptionDepartement Physique Nucleaire et Corpusculaire (PNC-IN2P3/CNRS), France
dc.descriptionDepartement Sciences de l'Univers (SDU-INSU/CNRS), France
dc.descriptionInstitut Lagrange de Paris (ILP), France within the Investissements d'Avenir Programme [LABEX ANR-10-LABX-63, ANR-11-IDEX-0004-02]
dc.descriptionBundesministerium fur Bildung und Forschung (BMBF), Germany
dc.descriptionDeutsche Forschungsgemeinschaft (DFG), Germany
dc.descriptionFinanzministerium Baden-Wurttemberg, Germany
dc.descriptionHelmholtz Alliance for Astroparticle Physics (HAP), Germany
dc.descriptionHelmholtz-Gemeinschaft Deutscher Forschungszentren (HGF), Germany
dc.descriptionMinisterium fur Wissenschaft und Forschung, Nordrhein Westfalen, Germany
dc.descriptionMinisterium fur Wissenschaft, Forschung und Kunst, Baden-Wurttemberg, Germany
dc.descriptionIstituto Nazionale di Fisica Nucleare (INFN), Italy
dc.descriptionMinistero dell'Istruzione, dell'Universita e della Ricerca (MIUR), Italy
dc.descriptionGran Sasso Center for Astroparticle Physics (CFA), Italy
dc.descriptionCETEMPS Center of Excellence, Italy
dc.descriptionMinistero degli Affari Esteri (MAE), Italy
dc.descriptionConsejo Nacional de Ciencia y Tecnologia (CONACYT), Mexico [167733]
dc.descriptionUniversidad Nacional Autonoma de Mexico (UNAM), PAPIIT DGAPA-UNAM, Mexico
dc.descriptionMinisterie van Onderwijs, Cultuur en Wetenschap, Netherlands
dc.descriptionNederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands
dc.descriptionStichting voor Fundamenteel Onderzoek der Materie (FOM), Netherlands
dc.descriptionNational Centre for Research and Development, Poland [ERA-NET-ASPERA/01/11, ERA-NET-ASPERA/02/11]
dc.descriptionNational Science Centre, Poland [2013/08/M/ST9/00322, 2013/08/M/ST9/00728, HARMONIA 5 - 2013/10/M/ST9/00062]
dc.descriptionPortuguese national funds Programa Operacional Factores de Competitividade through Fundacao para a Ciencia e a Tecnologia (COMPETE), Portugal
dc.descriptionFEDER funds within Programa Operacional Factores de Competitividade through Fundacao para a Ciencia e a Tecnologia (COMPETE), Portugal
dc.descriptionRomanian Authority for Scientific Research ANCS, CNDI-UEFISCDI partnership projects [20/2012, 194/2012, PN 16 42 01 02]
dc.descriptionSlovenian Research Agency, Slovenia
dc.descriptionComunidad de Madrid, Spain
dc.descriptionFondo Europeo de Desarrollo Regional (FEDER) funds, Spain
dc.descriptionXunta de Galicia, Spain
dc.descriptionEuropean Community 7th Framework Program, Spain [FP7-PEOPLE-2012-IEF-328826]
dc.descriptionScience and Technology Facilities Council, United Kingdom
dc.descriptionDepartment of Energy, USA [DE-AC02-07CH11359, DE-FR02-04ER41300, DE-FG02-99ER41107, DE-SC0011689]
dc.descriptionNational Science Foundation, USA [0450696]
dc.descriptionGrainger Foundation, USA
dc.descriptionNAFOSTED, Vietnam
dc.descriptionMarie Curie-IRSES/EPLANET
dc.descriptionEuropean Particle Physics Latin American Network
dc.descriptionEuropean Union 7th Framework Program [PIRSES-2009-GA-246806]
dc.descriptionUNESCO
dc.description[MSMT CR LG15014]
dc.description[LO1305]
dc.description[LM2015038]
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.languageEnglish
dc.publisherElsevier Science BV
dc.publisherAmsterdam
dc.relationPhysics Letters B
dc.rightsaberto
dc.sourceWOS
dc.subjectPierre Auger Observatory
dc.subjectCosmic Rays
dc.subjectMass Composition
dc.subjectAnkle
dc.titleEvidence For A Mixed Mass Composition At The 'ankle' In The Cosmic-ray Spectrum
dc.typeArtículos de revistas


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