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. 2008 Aug 8;101(6):061101.
doi: 10.1103/PhysRevLett.101.061101. Epub 2008 Aug 4.

Observation of the suppression of the flux of cosmic rays above 4 x 10 (19) eV

J Abraham  1 P AbreuM AgliettaC AguirreD AllardI AllekotteJ AllenP AllisonJ Alvarez-MuñizM AmbrosioL AnchordoquiS AndringaA AnzaloneC AramoS ArgiròK ArisakaE ArmengaudF ArneodoF ArquerosT AschH AsoreyP AssisB S AtulugamaJ AublinM AveG AvilaT BäckerD BadagnaniA F BarbosaD BarnhillS L C BarrosoB BaughmanP BauleoJ J BeattyT BeauB R BeckerK H BeckerJ A BellidoS BenzviC BeratT BergmannP BernardiniX BertouP L BiermannP BilloirO Blanch-BigasF BlancoP BlasiC BleveH BlümerM BohácováC BonifaziR BoninoJ BrackP BrogueiraW C BrownP BuchholzA BuenoR E BurtonN G BuscaK S Caballero-MoraB CaiD V CaminL CarameteR CarusoW CarvalhoA CastellinaO CatalanoG CataldiL CazonR CesterJ ChauvinA ChiavassaJ A ChinellatoA ChouJ ChudobaJ ChyeP D J ClarkR W ClayE ColomboR ConceiçãoB ConnollyF ContrerasJ CoppensA CordierU CottiS CoutuC E CovaultA CreusotA CrissJ CroninA CurutiuS Dagoret-CampagneK DaumillerB R DawsonR M de AlmeidaC De DonatoS J de JongG De La VegaW J M de Mello JuniorJ R T de Mello NetoI De MitriV de SouzaL Del PeralO DelignyA Della SelvaC Delle FratteH DembinskiC Di GiulioJ C DiazP N DiepC DobrigkeitJ C D'OlivoP N DongD DornicA DorofeevJ C Dos AnjosM T DovaD D'UrsoI DutanM A DuvernoisR EngelL EpeleM ErdmannC O EscobarA EtchegoyenP Facal San LuisH FalckeG FarrarA C FauthN FazziniF FerrerA FerreroB FickA FilevichA FilipcicI FleckC E FracchiollaW FulgioneB GarcíaD García GámezD Garcia-PintoX GarridoH GeenenG GelminiH GemmekeP L GhiaM GillerH GlassM S GoldG GolupF Gomez AlbarracinM Gómez BerissoP GonçalvesM Gonçalves do AmaralD GonzalezJ G GonzalezM GonzálezD GóraA GorgiP GouffonV GrassiA F GrilloC GrunfeldY GuardincerriF GuarinoG P GuedesJ GutiérrezJ D HagueV HalenkaJ C HamiltonP HansenD HarariS HarmsmaJ L HartonA HaungsT HauschildtM D HealyT HebbekerG HebreroD HeckC HojvatV C HolmesP HomolaJ R HörandelA HornefferM HrabovskýT HuegeM HussainM IarloriA InsoliaF IonitaA ItalianoM KaducakK H KampertT KarovaP KasperB KéglB KeilhauerE KempR M KieckhaferH O KlagesM KleifgesJ KleinfellerR KnapikJ KnappD-H KoangA KriegerO KrömerD KuempelN KunkaA KusenkoG La RosaC LachaudB L LagoD LebrunP LebrunJ LeeM A Leigui de OliveiraA Letessier-SelvonM LeutholdI Lhenry-YvonR LópezA Lopez AgüeraJ Lozano BahiloA LuceroR Luna GarcíaM C MaccaroneC MacolinoS MalderaG MancarellaM E ManceñidoD MandatP MantschA G MariazziI C MarisH R Marquez FalconD MartelloJ MartínezO Martínez BravoH J MathesJ MatthewsJ A J MatthewsG MatthiaeD MaurizioP O MazurT McCauleyM McEwenR R McNeilM C MedinaG Medina-TancoD MeloE MenichettiA MenschikovC MeurerR MeyhandanM I MichelettiG MieleW MillerS MollerachM MonasorD Monnier RagaigneF MontanetB MoralesC MorelloJ C MorenoC MorrisM MostafáM A MullerR MussaG NavarraJ L NavarroS NavasP NecesalL NellenC Newman-HolmesD NewtonP T NhungN NierstenhoeferD NitzD NosekL NozkaJ OehlschlägerT OhnukiA OlintoV M Olmos-GilbajaM OrtizF OrtolaniS OstapchenkoL OteroN PachecoD Pakk Selmi-DeiM PalatkaJ PallottaG ParenteE ParizotS ParlatiS PastorM PatelT PaulV PavlidouK PayetM PechJ PekalaR PelayoI M PepeL PerroneR PesceS PetreraP PetrincaY PetrovA PichelR PiegaiaT PierogM PimentaT PintoV PirronelloO PisantiM PlatinoJ PochonP PriviteraM ProuzaE J QuelJ RautenbergA RedondoS ReucroftB RevenuF A S RezendeJ RidkyS RiggiM RisseC RivièreV RiziM RobertsC RobledoG RodriguezJ Rodriguez MartinoJ Rodriguez RojoI Rodriguez-CaboM D Rodríguez-FríasG RosJ RosadoM RothB Rouillé-d'OrfeuilE RouletA C RoveroF SalamidaH SalazarG SalinaF SánchezM SantanderC E SantoE M SantosF SarazinS SarkarR SatoV ScheriniH SchielerA SchmidtF SchmidtT SchmidtO ScholtenP SchovánekF SchroederS SchulteF SchüsslerS J SciuttoM ScuderiA SegretoD SemikozM SettimoR C ShellardI SidelnikB B SiffertG SiglN Smetniansky De GrandeA SmiałkowskiR SmídaA G K SmithB E SmithG R SnowP SokolskyP SommersJ SorokinH SpinkaR SquartiniE StrazzeriA StutzF SuarezT SuomijärviA D SupanitskyM S SutherlandJ SwainZ SzadkowskiJ TakahashiA TamashiroA TamburroT TarutinaO TaşcăuR TcaciucN T ThaoD ThomasR TiconaJ TiffenbergC TimmermansW TkaczykC J Todero PeixotoB ToméA TonachiniI TorresP TravnicekA TripathiG TristramD TscherniakhovskiV TuciM TuerosV TunnicliffeR UlrichM UngerM UrbanJ F Valdés GaliciaI ValiñoL ValoreA M van den BergV van ElewyckR A VázquezD VebericA VeigaA VelardeT VentersV VerziM VidelaL VillaseñorS VorobiovL VoyvodicH WahlbergP WahrlichO WainbergP WalkerD WarnerA A WatsonS WesterhoffG WieczorekL WienckeB WilczyńskaH WilczyńskiC WilemanM G WinnickH WuB WundheilerT YamamotoP YounkE ZasD ZavrtanikM ZavrtanikI ZawA ZepedaM ZiolkowskiPierre Auger Collaboration
Affiliations

Observation of the suppression of the flux of cosmic rays above 4 x 10 (19) eV

J Abraham et al. Phys Rev Lett. .

Abstract

The energy spectrum of cosmic rays above 2.5 x 10;{18} eV, derived from 20,000 events recorded at the Pierre Auger Observatory, is described. The spectral index gamma of the particle flux, J proportional, variantE;{-gamma}, at energies between 4 x 10;{18} eV and 4 x 10;{19} eV is 2.69+/-0.02(stat)+/-0.06(syst), steepening to 4.2+/-0.4(stat)+/-0.06(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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