Journal
PHYSICAL REVIEW D
Volume 91, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.91.032003
Keywords
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Funding
- Comision Nacional de Energia Atomica
- Fundacion Antorchas
- Gobierno De La Provincia de Mendoza
- Municipalidad de Malargue
- NDM Holdings
- Valle Las Lenas
- Australian Research Council
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Financiadora de Estudos e Projetos (FINEP)
- Fundacao de Amparo a Pesquisa do Estado de Rio de Janeiro (FAPERJ)
- Sao Paulo Research Foundation (FAPESP) [2010/07359-6, 1999/05404-3]
- Ministerio de Ciencia e Tecnologia (MCT), Brazil
- Czech Science Foundation, Czech Republic [14-17501S]
- Centre de Calcul [IN2P3/CNRS]
- Centre National de la Recherche Scientifique (CNRS)
- Conseil Regional Ile-de-France
- Departement Physique Nucleaire et Corpusculaire [PNC-IN2P3/CNRS]
- Departement Sciences de l'Univers [SDU-INSU/CNRS]
- Institut Lagrange de Paris, within the Investissements d'Avenir Programme, France [ILP LABEX ANR-10-LABX-63, ANR-11-IDEX-0004-02]
- Bundesministerium fur Bildung und Forchung (BMBF), Deutsche Forschungsgemeinschaft (DFG), Finanzministerium Baden-Wurttermberg, Helmholtz-Gemeinschaft Deutscher Forschungszentren
- Istituto Nazionale di Fisica Nucleare (INFN), Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR), Gran Sasso Center for Astroparticle Physics (CFA), CETEMPS Center of Excellence, Italy
- Consejo Nacional de Ciencia y Tecnologia (CONACYT), Mexico
- Ministerie van Onderwijs, Cultuur en Wetenschap, Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Stichting voor Fundamenteel Onderzoek der Materie (FOM), Netherlands
- National Centre for Research and Development [ERA-NET-ASPERA/01/11, ERA-NET-ASPERA/02/11]
- National Science Centre, Poland [2013/08/M/ST9/00322, 2013/08/M/ST9/00728, HARMONIA 5 - 2013/10/M/ST9/00062]
- Portuguese national funds
- FEDER funds within COMPETE-Programa Operacional Factores de Competitividade through Fundacao para a Ciencia e a Tecnologia, Portugal
- Romanian Authority for Scientific Research ANCS [CNDI-UEFISCDI, 20/2012, 194/2012, 1/ASPERA2/2012 ERA-NET, PN-II-RU-PD-2011-3-0145-17, PN-II-RU-PD-2011-3-0062]
- Minister of National Education, Programme for research-Space Technology and Advanced Research-STAR, Romania [83/2013]
- Slovenian Research Agency, Slovenia
- Grant No. 83/2013, Romania
- Slovenian Research Agency, Slovenia
- Comunidad de Madrid, FEDER funds, Ministerio de Educacion y Ciencia, Xunta de Galicia, European Community 7th Framework Program, Spain [FP7-PEOPLE-2012-IEF-328826]
- Science and Technology Facilities Council, United Kingdom
- Department of Energy [DE-AC02-07CH11359, DE-FR02-04ER41300, DE-FG02-99ER41107, DE-SC0011689]
- National Science Foundation, The Grainger Foundation, USA [0450696]
- NAFOSTED, Vietnam
- Marie Curie-IRSES/EPLANET, European Particle Physics Latin American Network, European Union 7th Framework Program [PIRSES-2009-GA-246806]
- UNESCO
- [MSMT-CR LG13007]
- [7AMB14AR005]
- [CZ.1.05/2.1.00/03.0058]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1153335] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1412261, 1205534, 0969400, 1506232, 1207253, 1207605] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1361172] Funding Source: National Science Foundation
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We present the first hybrid measurement of the average muon number in air showers at ultrahigh energies, initiated by cosmic rays with zenith angles between 62 degrees and 80 degrees. The measurement is based on 174 hybrid events recorded simultaneously with the surface detector array and the fluorescence detector of the Pierre Auger Observatory. The muon number for each shower is derived by scaling a simulated reference profile of the lateral muon density distribution at the ground until it fits the data. A 10(19) eV shower with a zenith angle of 67 degrees, which arrives at the surface detector array at an altitude of 1450 m above sea level, contains on average (2.68 +/- 0.04 +/- 0.48(sys)) x 10(7) muons with energies larger than 0.3 GeV. The logarithmic gain d lnN mu/d ln E of muons with increasing energy between 4 x 10(18) eV and 5 x 10(19) eV is measured to be (1.029 +/- 0.024) 0.030(sys)).
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