Observation of the Suppression of the Flux of Cosmic Rays above<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>4</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mn>10</mml:mn><mml:mn>19</mml:mn></mml:msup><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>eV</mml:mi></mml:math>
J. AbrahamUniversidad Tecnológica Nacional, FR-Mendoza, ArgentinaP. AbreuLIP and Instituto Superior Técnico, Lisboa, PortugalM. AgliettaIstituto di Fisica dello Spazio Interplanetario (INAF), Università di Torino and Sezione INFN, Torino, ItalyC. AguirreUniversidad Catolica de Bolivia, La Paz, BoliviaD. AllardLaboratoire AstroParticule et Cosmologie, Université Paris 7, IN2P3/CNRS, Paris, FranceI. AllekotteCentro Atómico Bariloche, Comision Nacional de Energía Atómica and Instituto Balseiro (CNEA-UNC), San Carlos de Bariloche, ArgentinaJ. AllenNew York University, New York, New York, USAP. AllisonOhio State University, Columbus, Ohio, USAJaime Álvarez-MuñizUniversidad de Santiago de Compostela, SpainM. AmbrosioSezione INFN di Napoli, Napoli, ItalyLuis A. AnchordoquiNortheastern University, Boston, Massachusetts, USAS. AndringaLIP and Instituto Superior Técnico, Lisboa, PortugalA. AnzaloneIstituto di Astrofisica Spaziale e Fisica Cosmica di Palermo (INAF), Palermo, ItalyC. AramoSezione INFN di Napoli, Napoli, ItalyS. ArgiròUniversità di Torino and Sezione INFN, Torino, ItalyK. ArisakaUniversity of California, Los Angeles, California, USAE. ArmengaudLaboratoire AstroParticule et Cosmologie, Université Paris 7, IN2P3/CNRS, Paris, FranceF. ArneodoINFN, Laboratori Nazionali del Gran Sasso, Assergi (L’Aquila), ItalyF. ArquerosUniversidad Complutense de Madrid, Madrid, SpainT. AschH. AsoreyCentro Atómico Bariloche, Comisión Nacional de Energía Atómica, San Carlos de Bariloche, ArgentinaP. AssisLIP and Instituto Superior Técnico, Lisboa, PortugalB.S. AtulugamaPennsylvania State University, University Park, Pennsylvania, USAJ. AublinLaboratoire de Physique Nucléaire et de Hautes Energies, Universités Paris 6 & 7, IN2P3/CNRS, Paris Cedex 05, FranceM. AveUniversity of Chicago, Enrico Fermi Institute, Chicago, Illinois, USAG. ÁvilaPierre Auger Southern Observatory and Comisión Nacional de Energía Atómica, Malargüe, ArgentinaT. BäckerUniversität Siegen, Siegen, GermanyD. BadagnaniIFLP, Universidad Nacional de La Plata and CONICET, La Plata, ArgentinaA.F. BarbosaCentro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, RJ, BrazilDavid BarnhillUniversity of California, Los Angeles, California, USAS. L. C. BarrosoUniversidade Estadual do Sudoeste da Bahia, Vitoria da Conquista, BA, BrazilB. M. BaughmanOhio State University, Columbus, Ohio, USAP. BauleoColorado State University, Fort Collins, Colorado, USAJ. J. BeattyOhio State University, Columbus, Ohio, USAT. BeauLaboratoire AstroParticule et Cosmologie, Université Paris 7, IN2P3/CNRS, Paris, FranceB. R. BeckerUniversity of New Mexico, Albuquerque, New Mexico, USAK. BeckerBergische Universität Wuppertal, Wuppertal, GermanyJose A. BellidoPennsylvania State University, University Park, Pennsylvania, USAS. BenZviUniversity of Wisconsin, Madison, Wisconsin, USAC. BératLaboratoire de Physique Subatomique et de Cosmologie, IN2P3/CNRS, Université Grenoble 1 et INPG, Grenoble, FranceT. BergmannUniversität Karlsruhe (TH), Institut für Experimentelle Kernphysik (IEKP), Karlsruhe, GermanyP. BernardiniDipartimento di Fisica dell’Università del Salento and Sezione INFN, Lecce, ItalyX. BertouCentro Atómico Bariloche, Comisión Nacional de Energía Atómica, San Carlos de Bariloche, ArgentinaPeter L. BiermannMax-Planck-Institut für Radioastronomie, Bonn, GermanyP. BilloirLaboratoire de Physique Nucléaire et de Hautes Energies, Universités Paris 6 & 7, IN2P3/CNRS, Paris Cedex 05, FranceO. Blanch-BigasLaboratoire de Physique Nucléaire et de Hautes Energies, Universités Paris 6 & 7, IN2P3/CNRS, Paris Cedex 05, FranceF. BlancoUniversidad Complutense de Madrid, Madrid, SpainPasquale BlasiFermilab, Batavia, Illinois, USAC. BleveSchool of Physics and Astronomy, University of Leeds, United KingdomH. BlümerForschungszentrum Karlsruhe, Institut für Kernphysik, Karlsruhe, GermanyM. BoháčováInstitute of Physics of the Academy of Sciences of the Czech Republic, Prague, Czech RepublicC. BonifaziCentro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, RJ, BrazilR. BoninoIstituto di Fisica dello Spazio Interplanetario (INAF), Università di Torino and Sezione INFN, Torino, ItalyJ. BrackColorado State University, Fort Collins, Colorado, USAP. BrogueiraLIP and Instituto Superior Técnico, Lisboa, PortugalW. C. BrownColorado State University, Pueblo, Colorado, USAP. BuchholzUniversität Siegen, Siegen, GermanyA. BuenoUniversidad de Granada & C.A.F.P.E., Granada, SpainR. E. BurtonCase Western Reserve University, Cleveland, Ohio, USANicolás G. BuscaLaboratoire AstroParticule et Cosmologie, Université Paris 7, IN2P3/CNRS, Paris, FranceK. S. Caballero‐MoraUniversität Karlsruhe (TH), Institut für Experimentelle Kernphysik (IEKP), Karlsruhe, GermanyB. CaiUniversity of Minnesota, Minneapolis, Minnesota, USAD.V. CaminUniversità di Milano and Sezione INFN, Milan, ItalyL. CarameteMax-Planck-Institut für Radioastronomie, Bonn, GermanyR. CarusoUniversità di Catania and Sezione INFN, Catania, ItalyW. Rodrigues de CarvalhoUniversidade de Sao Paulo, Instituto de Fisica, Sao Paulo, SP, BrazilA. CastellinaIstituto di Fisica dello Spazio Interplanetario (INAF), Università di Torino and Sezione INFN, Torino, ItalyO. CatalanoIstituto di Astrofisica Spaziale e Fisica Cosmica di Palermo (INAF), Palermo, ItalyG. CataldiDipartimento di Fisica dell’Università del Salento and Sezione INFN, Lecce, ItalyLorenzo CazonUniversity of Chicago, Enrico Fermi Institute, Chicago, Illinois, USAR. CesterUniversità di Torino and Sezione INFN, Torino, ItalyJ. ChauvinLaboratoire de Physique Subatomique et de Cosmologie, IN2P3/CNRS, Université Grenoble 1 et INPG, Grenoble, FranceA. ChiavassaIstituto di Fisica dello Spazio Interplanetario (INAF), Università di Torino and Sezione INFN, Torino, ItalyC. DobrigkeitUniversidade Estadual de Campinas, IFGW, Campinas, SP, BrazilA. ChouFermilab, Batavia, Illinois, USAJ. ChudobaInstitute of Physics of the Academy of Sciences of the Czech Republic, Prague, Czech RepublicJ. ChyeMichigan Technological University, Houghton, Michigan, USAP. ClarkInstitute of Integrated Information Systems, University of Leeds, United KingdomR. W. ClayUniversity of Adelaide, Adelaide, S.A., AustraliaE. ColomboLaboratorio Tandar, Centro Atómico Constituyentes, CNEA, Buenos Aires, ArgentinaR. ConceiçãoLIP and Instituto Superior Técnico, Lisboa, PortugalBrian ConnollyUniversity of Pennsylvania, Philadelphia, Pennsylvania, USAF. ContrerasPierre Auger Southern Observatory, Malargüe, ArgentinaJ. CoppensIMAPP, Radboud University, Nijmegen, NetherlandsA. CordierLaboratoire de l’Accélérateur Linéaire, Université Paris-Sud, IN2P3/CNRS, Orsay, FranceU. CottiUniversidad Michoacana de San Nicolas de Hidalgo, Morelia, Michoacan, MexicoS. CoutuPennsylvania State University, University Park, Pennsylvania, USAC. E. CovaultCase Western Reserve University, Cleveland, Ohio, USAA. CreusotLaboratory for Astroparticle Physics, University of Nova Gorica, SloveniaA. CrissPennsylvania State University, University Park, Pennsylvania, USAJ. CroninUniversity of Chicago, Enrico Fermi Institute, Chicago, Illinois, USAA. CurutiuMax-Planck-Institut für Radioastronomie, Bonn, GermanyS. Dagoret-CampagneLaboratoire de l’Accélérateur Linéaire, Université Paris-Sud, IN2P3/CNRS, Orsay, FranceK. DaumillerForschungszentrum Karlsruhe, Institut für Kernphysik, Karlsruhe, GermanyB. R. DawsonUniversity of Adelaide, Adelaide, S.A., AustraliaR. M. de AlmeidaUniversidade Estadual de Campinas, IFGW, Campinas, SP, BrazilC. De DonatoUniversità di Milano and Sezione INFN, Milan, ItalyS. J. de JongIMAPP, Radboud University, Nijmegen, NetherlandsG. De La VegaUniversidad Tecnológica Nacional, FR-Mendoza and Fundación Universidad Tecnológica Nacional, ArgentinaW. J. M. de MelloUniversidade Estadual de Campinas, IFGW, Campinas, SP, Brazil
2008lv
ABI
Аннотация
The energy spectrum of cosmic rays above $2.5\ifmmode\times\else\texttimes\fi{}{10}^{18}\text{ }\mathrm{eV}$, derived from 20 000 events recorded at the Pierre Auger Observatory, is described. The spectral index $\ensuremath{\gamma}$ of the particle flux, $J\ensuremath{\propto}{E}^{\ensuremath{-}\ensuremath{\gamma}}$, at energies between $4\ifmmode\times\else\texttimes\fi{}{10}^{18}\text{ }\mathrm{eV}$ and $4\ifmmode\times\else\texttimes\fi{}{10}^{19}\text{ }\mathrm{eV}$ is $2.69\ifmmode\pm\else\textpm\fi{}0.02(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.06(\mathrm{syst})$, steepening to $4.2\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.06(\mathrm{syst})$ at higher energies. The hypothesis of a single power law is rejected with a significance greater than 6 standard deviations. The data are consistent with the prediction by Greisen and by Zatsepin and Kuz'min.
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