Artículo
Multitudinario:425 "Evidence for a mixed mass composition at the ‘ankle’ in the cosmic-ray spectrum" (2016) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 762:288-295
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Abstract:
We 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. © 2016 The Author(s)
Registro:
| Documento: | Artículo |
| Título: | Evidence for a mixed mass composition at the ‘ankle’ in the cosmic-ray spectrum |
| Autor: | Multitudinario:425 |
| Filiación: | Centro Atómico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET), Argentina Centro de Investigaciones en Láseres y Aplicaciones, CITEDEF, CONICET, Argentina Departamento de Física, Departamento de Ciencias de la Atmósfera y los Océanos, FCEyN, Universidad de Buenos Aires, Argentina IFLP, Universidad Nacional de La Plata, CONICET, Argentina Instituto de Astronomía y Física del Espacio, IAFE, CONICET-UBA, Argentina Instituto de Física de Rosario (IFIR) – CONICET/U.N.R., Facultad de Ciencias Bioquímicas y Farmacéuticas U.N.R., Argentina Instituto de Tecnologías en Detección y Astropartículas, CNEA, CONICET, UNSAM, Universidad Tecnológica Nacional – Facultad Regional Mendoza (CONICET/CNEA), Argentina Instituto de Tecnologías en Detección y Astropartículas, CNEA, CONICET, UNSAM, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Argentina Observatorio Pierre Auger, Argentina Observatorio Pierre Auger, Comisión Nacional de Energía Atómica, Argentina Universidad Tecnológica Nacional, Facultad Regional Buenos Aires, Argentina University of Adelaide, Australia Centro Brasileiro de Pesquisas Fisicas (CBPF), Brazil Universidade de São Paulo, Escola de Engenharia de Lorena, Brazil Universidade de São Paulo, Inst. de Física de São Carlos, São Carlos, Brazil Universidade de São Paulo, Inst. de Física, São Paulo, Brazil Universidade Estadual de Campina (UNICAMP), Brazil Universidade Estadual de Feira de Santana (UEFS), Brazil Universidade Federal de Pelotas, Brazil Universidade Federal do ABC (UFABC), Brazil Universidade Federal do Paraná, Setor Palotina, Brazil Universidade Federal do Rio de Janeiro (UFRJ), Instituto de Física, Brazil Universidade Federal Fluminense, Brazil Universidad Industrial de Santander, Colombia Institute of Physics (FZU) of the Academy of Sciences of the Czech Republic, Czech Republic Palacky University, RCPTM, Czech Republic University, Institute of Particle and Nuclear Physics, Prague, Czech Republic Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris 11, CNRS–IN2P3, France Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), Universités Paris 6 et Paris 7, CNRS–IN2P3, France Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Grenoble-Alpes, CNRS/IN2P3, France Bergische Universität Wuppertal, Department of Physics, Germany Karlsruhe Institute of Technology, Institut für Experimentelle Kernphysik (IEKP), Germany Karlsruhe Institute of Technology, Institut für Kernphysik (IKP), Germany Karlsruhe Institute of Technology, Institut für Prozessdatenverarbeitung und Elektronik (IPE), Germany RWTH Aachen University, III. Physikalisches Institut A, Germany Universität Hamburg, II. Institut für Theoretische Physik, Germany Universität Siegen, Fachbereich 7 Physik – Experimentelle Teilchenphysik, Germany Gran Sasso Science Institute (INFN), L'Aquila, Italy INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo, Italy INFN Laboratori Nazionali del Gran Sasso, Italy INFN, Gruppo Collegato dell'Aquila, Italy INFN, Sezione di Catania, Italy INFN, Sezione di Lecce, Italy INFN, Sezione di Milano, Italy INFN, Sezione di Napoli, Italy INFN, Sezione di Roma “Tor Vergata”, Italy INFN, Sezione di Torino, Italy Osservatorio Astrofisico di Torino (INAF), Torino, Italy Università del Salento, Dipartimento di Ingegneria, Italy Università del Salento, Dipartimento di Matematica e Fisica “E. De Giorgi”, Italy Università dell'Aquila, Dipartimento di Scienze Fisiche e Chimiche, Italy Università di Catania, Dipartimento di Fisica e Astronomia, Italy Università di Milano, Dipartimento di Fisica, Italy Università di Napoli “Federico II”, Dipartimento di Fisica “Ettore Pancini”, Italy Università di Roma “Tor Vergata”, Dipartimento di Fisica, Italy Università, Dipartimento di Fisica, Torino, Italy Benemérita Universidad Autónoma de Puebla (BUAP), Mexico Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV), Mexico Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas del Instituto Politécnico Nacional (UPIITA-IPN), Mexico Universidad Autónoma de Chiapas, Mexico Universidad Michoacana de San Nicolás de Hidalgo, Mexico Universidad Nacional Autónoma de México, Mexico Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud Universiteit, Nijmegen, Netherlands KVI – Center for Advanced Radiation Technology, University of Groningen, Netherlands Nationaal Instituut voor Kernfysica en Hoge Energie Fysica (NIKHEF), Netherlands Stichting Astronomisch Onderzoek in Nederland (ASTRON), Dwingeloo, Netherlands Institute of Nuclear Physics PAN, Poland University of Łódź, Faculty of Astrophysics, Poland University of Łódź, Faculty of High-Energy Astrophysics, Poland Laboratório de Instrumentação e Física Experimental de Partículas – LIP, Instituto Superior Técnico – IST, Universidade de Lisboa – UL, Portugal “Horia Hulubei” National Institute for Physics and Nuclear Engineering, Romania Institute of Space Science, Romania University of Bucharest, Physics Department, Romania University Politehnica of Bucharest, Romania Experimental Particle Physics Department, J. Stefan Institute, Slovenia Laboratory for Astroparticle Physics, University of Nova Gorica, Slovenia Universidad Complutense de Madrid, Spain Universidad de Alcalá de Henares, Spain Universidad de Granada, C.A.F.P.E., Spain Universidad de Santiago de Compostela, Spain Case Western Reserve University, United States Colorado School of Mines, United States Colorado State University, United States Department of Physics and Astronomy, Lehman College, City University of New York, United States Fermi National Accelerator Laboratory, United States Louisiana State University, United States Michigan Technological University, United States New York University, United States Northeastern University, United States Ohio State University, United States Pennsylvania State University, United States University of Chicago, United States University of Hawaii, United States University of Nebraska, United States University of New Mexico, United States Max-Planck-Institut für Radioastronomie, Bonn, Germany Deutsches Elektronen-Synchrotron (DESY), Zeuthen, Germany SUBATECH, École des Mines de Nantes, CNRS–IN2P3, Université de Nantes, Germany Vrije Universiteit Brussels, Brussels, Belgium School of Physics and Astronomy, University of Leeds, Leeds, United Kingdom Los Alamos National Laboratory, United States |
| Palabras clave: | Ankle; Cosmic rays; Mass composition; Pierre Auger Observatory |
| Año: | 2016 |
| Volumen: | 762 |
| Página de inicio: | 288 |
| Página de fin: | 295 |
| DOI: | http://dx.doi.org/10.1016/j.physletb.2016.09.039 |
| Título revista: | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
| Título revista abreviado: | Phys Lett Sect B Nucl Elem Part High-Energy Phys |
| ISSN: | 03702693 |
| CODEN: | PYLBA |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v762_n_p288_Multitudinario |
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Citas:
---------- APA ----------
(2016) . Evidence for a mixed mass composition at the ‘ankle’ in the cosmic-ray spectrum. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 762, 288-295.http://dx.doi.org/10.1016/j.physletb.2016.09.039
---------- CHICAGO ----------
Multitudinario:425. "Evidence for a mixed mass composition at the ‘ankle’ in the cosmic-ray spectrum" . Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 762 (2016) : 288-295.http://dx.doi.org/10.1016/j.physletb.2016.09.039
---------- MLA ----------
Multitudinario:425. "Evidence for a mixed mass composition at the ‘ankle’ in the cosmic-ray spectrum" . Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 762, 2016, pp. 288-295.http://dx.doi.org/10.1016/j.physletb.2016.09.039
---------- VANCOUVER ----------
Multitudinario:425. Evidence for a mixed mass composition at the ‘ankle’ in the cosmic-ray spectrum. Phys Lett Sect B Nucl Elem Part High-Energy Phys. 2016;762:288-295.http://dx.doi.org/10.1016/j.physletb.2016.09.039
