completed in austral season South Pole completed in austral season.

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Presentation transcript:

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completed in 2010-2011 austral season IceCube @ South Pole completed in 2010-2011 austral season

125m 10m IceCube Laboratory South Pole, Feb 2011 Serap Tilav

in Equatorial Coordinates 28 events on a background of 10.6 (+4.5/-3.9) Directions in Equatorial Coordinates Energy Spectrum Harder than any expected atmospheric background No significant clustering 5 events near Galactic Center

Neutrino Telescope & 3D Cosmic Ray Detector IceCube Neutrino Telescope & 3D Cosmic Ray Detector Air shower detection @ 2835m altitude (692 g/cm2) IceTop surface air shower array 81 Stations on the surface 2 Ice Cherenkov Tanks per Station 2 Digital Optical Modules per Tank IceTop EM component near shower max shower size & arrival times over 1km2 IceCube Muonic component @ 1450m-2450m depth in ice muon bundle energy over 1km IceCube Array 86 Strings @1450-2450 m depth in ice 60 Digital Optical Modules per String IceTop: Calibration device for IceCube  measure cosmic ray spectrum and composition as input to neutrino calculations

Primary Cosmic Ray Interaction with atmospheric nuclei Air Shower

IceTop Tank 0.9 m 2 m perlite ice Diffusely reflecting liner Solid block of clear ice “ Ice Cherenkov Tank” Single tank detects secondary particles in air showers : -- MeV e± -- converting γ -- ~1 GeV μ Light yield (Cherenkov and stochastic) for each particle type is derived from a detailed GEANT4 simulation and parameterized

IceTop Station 2 tanks per station 1 tank hit  muon, e or γ Photo: James Roth, Dec 8, 2007 2 tanks per station 1 tank hit  muon, e or γ both tanks hit  air shower 2 DOMs per tank 1 HG, 1 LG for dynamic range

Air Shower Reconstruction On the surface: Shower core: x,y,z Shower direction: θ,ϕ Shower front from arrival times S125 β S125 : signal at r = 125m β : slope at r = 125m κ : fixed at 0.3 On the surface: IceTop shower size S125 and β In deep ice: Muon bundle energy loss dE/dX (GeV/m) and stochastic behavior

IceCube-79 / IceTop-73 Coincidence Analysis 5-6-4-2 Neural Network to map 5 observables to Primary Energy and Mass Energy spectrum directly from NN output Composition from fitting data in Ereco bins to template histograms (H,He,0,Fe) from NN mass output e.g. Template histograms for 4 mass groups in one energy bin for a fake dataset scrambled from MC

IceCube-79 / IceTop-73 Coincidence Analysis Large structures in PeV cosmic-ray spectrum Composition <lnA> gray band is ±7 composition systematics of IceTop-73 analysis Highest resolution spectrum ever measured by air-shower experiment Spectrum does not follow a simple power law clear trend towards heavier composition up to ~100 PeV

New era in ν astronomy A step closer in understanding high-energy cosmic particles