6533b7cffe1ef96bd1258b94
RESEARCH PRODUCT
Measurement of the cosmic-ray energy spectrum above 2.5×1018 eV using the Pierre Auger Observatory
A. AabP. AbreuM. AgliettaJ. M. AlburyI. AllekotteA. AlmelaJ. Alvarez CastilloJ. Alvarez-muñizR. Alves BatistaG. A. AnastasiL. AnchordoquiB. AndradaS. AndringaC. AramoP. R. Araújo FerreiraH. AsoreyP. AssisG. AvilaA. M. BadescuA. BakalovaA. BalaceanuF. BarbatoR. J. Barreira LuzK. H. BeckerJ. A. BellidoC. BeratM. E. BertainaX. BertouP. L. BiermannT. BisterJ. BiteauA. BlancoJ. BlazekC. BleveM. BoháčováD. BoncioliC. BonifaziL. Bonneau ArbeletcheN. BorodaiA. M. BottiJ. BrackT. BretzF. L. BriechleP. BuchholzA. BuenoS. BuitinkM. BuscemiK. S. Caballero-moraL. CaccianigaL. CalcagniA. CancioF. CanforaI. CaracasJ. M. CarcellerR. CarusoA. CastellinaF. CatalaniG. CataldiL. CazonM. CerdaJ. A. ChinellatoK. ChoiJ. ChudobaL. ChytkaR. W. ClayA. C. Cobos CeruttiR. ColalilloA. ColemanM. R. ColucciaR. ConceiçãoA. CondorelliG. ConsolatiF. ContrerasF. ConvengaC. E. CovaultS. DassoK. DaumillerB. R. DawsonJ. A. DayR. M. De AlmeidaJ. De JesúsS. J. De JongG. De MauroJ. R. T. De Mello NetoI. De MitriJ. De OliveiraD. De Oliveira FrancoV. De SouzaE. De VitoJ. DebatinM. Del RíoO. DelignyH. DembinskiN. DhitalC. Di GiulioA. Di MatteoM. L. Díaz CastroC. DobrigkeitJ. C. D’olivoQ. DorostiR. C. Dos AnjosM. T. DovaJ. EbrR. EngelI. EpicocoM. ErdmannC. O. EscobarA. EtchegoyenH. FalckeJ. FarmerG. FarrarA. C. FauthN. FazziniF. FeldbuschF. FenuB. FickJ. M. FigueiraA. FilipčičT. FodranM. M. FreireT. FujiiA. FusterC. GaleaC. GalelliB. GarcíaA. L. Garcia VegasH. GemmekeF. GesualdiA. Gherghel-lascuP. L. GhiaU. GiaccariM. GiammarchiM. GillerJ. GlombitzaF. GobbiF. GollanG. GolupM. Gómez BerissoP. F. Gómez VitaleJ. P. GongoraN. GonzálezI. GoosD. GóraA. GorgiM. GottowikT. D. GrubbF. GuarinoG. P. GuedesE. GuidoS. HahnR. HallidayM. R. HampelP. HansenD. HarariV. M. HarveyA. HaungsT. HebbekerD. HeckG. C. HillC. HojvatJ. R. HörandelP. HorvathM. HrabovskýT. HuegeJ. HulsmanA. InsoliaP. G. IsarJ. A. JohnsenJ. JurysekA. KääpäK. H. KampertB. KeilhauerJ. KempH. O. KlagesM. KleifgesJ. KleinfellerM. KöpkeG. Kukec MezekB. L. LagoD. LahurdR. G. LangM. A. Leigui De OliveiraV. LenokA. Letessier-selvonI. Lhenry-yvonD. Lo PrestiL. LopesR. LópezR. LorekQ. LuceA. LuceroA. Machado PayerasM. MalacariG. MancarellaD. MandatB. C. ManningJ. ManshandenP. MantschS. MaraficoA. G. MariazziI. C. MarişG. MarsellaD. MartelloH. MartinezO. Martínez BravoM. MastrodicasaH. J. MathesJ. MatthewsG. MatthiaeE. MayotteP. O. MazurG. Medina-tancoD. MeloA. MenshikovK. -D. MerendaS. MichalM. I. MichelettiL. MiramontiD. MocklerS. MollerachF. MontanetC. MorelloM. MostafáA. L. MüllerM. A. MullerK. MulreyR. MussaM. MuzioW. M. NamasakaL. NellenP. H. NguyenM. Niculescu-oglinzanuM. NiechciolD. NitzD. NosekV. NovotnyL. NožkaA. NucitaL. A. NúñezM. PalatkaJ. PallottaM. P. PanettaP. PapenbreerG. ParenteA. ParraM. PechF. PedreiraJ. PȩkalaR. PelayoJ. Peña-rodriguezJ. Perez ArmandM. PerlinL. PerroneC. PetersS. PetreraT. PierogM. PimentaV. PirronelloM. PlatinoB. PontM. PothastP. PriviteraM. ProuzaA. PuyleartS. QuerchfeldJ. RautenbergD. RavignaniM. ReininghausJ. RidkyF. RiehnM. RisseP. RistoriV. RiziW. Rodrigues De CarvalhoG. Rodriguez FernandezJ. Rodriguez RojoM. J. RoncoroniM. RothE. RouletA. C. RoveroP. RuehlS. J. SaffiA. SaftoiuF. SalamidaH. SalazarG. SalinaJ. D. Sanabria GomezF. SánchezE. M. SantosE. SantosF. SarazinR. SarmentoC. Sarmiento-canoR. SatoP. SavinaC. SchäferV. ScheriniH. SchielerM. SchimassekM. SchimpF. SchlüterD. SchmidtO. ScholtenP. SchovánekF. G. SchröderS. SchröderA. SchulzS. J. SciuttoM. ScornavaccheR. C. ShellardG. SiglG. SilliO. SimaR. ŠMídaP. SommersJ. F. SorianoJ. SouchardR. SquartiniM. StadelmaierD. StancaS. StaničJ. StasielakP. StassiA. StreichM. Suárez-duránT. SudholzT. SuomijärviA. D. SupanitskyJ. ŠUpíkZ. SzadkowskiA. TaboadaA. TapiaC. TimmermansO. TkachenkoP. TobiskaC. J. Todero PeixotoB. ToméG. Torralba ElipeA. TravainiP. TravnicekC. TrimarelliM. TriniM. TuerosR. UlrichM. UngerM. UrbanL. VaclavekM. VaculaJ. F. Valdés GaliciaI. ValiñoL. ValoreA. Van VlietE. VarelaB. Vargas CárdenasA. Vásquez-ramírezD. VeberičC. VenturaI. D. Vergara QuispeV. VerziJ. VichaL. VillaseñorJ. VinkS. VorobiovH. WahlbergA. A. WatsonM. WeberA. WeindlL. WienckeH. WilczyńskiT. WinchenM. WirtzD. WittkowskiB. WundheilerA. YushkovO. ZapparrataE. ZasD. ZavrtanikM. ZavrtanikL. ZehrerA. ZepedaM. ZiolkowskiF. Zuccarellosubject
cosmic ray; astroparticle detectors; cosmic ray spectraEnergy SpectrumSettore FIS/01 - Fisica SperimentaleUltra-high energy cosmic rays energy spectrum Cherenkov detectorsUHE Cosmic Raysdescription
We report a measurement of the energy spectrum of cosmic rays for energies above 2.5×10^18 eV based on 215,030 events recorded with zenith angles below 60°. A key feature of the work is that the estimates of the energies are independent of assumptions about the unknown hadronic physics or of the primary mass composition. The measurement is the most precise made hitherto with the accumulated exposure being so large that the measurements of the flux are dominated by systematic uncertainties except at energies above 5×10^19 eV. The principal conclusions are(1) The flattening of the spectrum near 5×10^18 eV, the so-called "ankle,"is confirmed.(2) The steepening of the spectrum at around 5×10^19 eV is confirmed.(3) A new feature has been identified in the spectrum: in the region above the ankle the spectral index γ of the particle flux (∝E^-γ) changes from 2.51±0.03 (stat)±0.05 (syst) to 3.05±0.05 (stat)±0.10 (syst) before changing sharply to 5.1±0.3 (stat)±0.1 (syst) above 5×10^19 eV.(4) No evidence for any dependence of the spectrum on declination has been found other than a mild excess from the Southern Hemisphere that is consistent with the anisotropy observed above 8×10^18 eV.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-01-01 |