1 Cosmic Rays in IceCube: Composition-Sensitive Observables Chihwa Song a, Peter Niessen b, Katherine Rawlins c for the IceCube collaboration a University.

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Presentation transcript:

1 Cosmic Rays in IceCube: Composition-Sensitive Observables Chihwa Song a, Peter Niessen b, Katherine Rawlins c for the IceCube collaboration a University of Wisconsin - Madison b University of Delaware c University of Alaska - Anchorage

2 80 pairs of frozen water tanks separated by ~10 m IceCube Observatory - 60 optical modules per string - String spacing: ~125 m Threshold energy: 300 TeV See Tom Gaisser's talk (HE.1.5, 9:30-10:00, July 5) 1450 m 2450 m IceTop IceCube

3 2 m 0.9 m clear ice Diffusely reflecting liner IceTop Tank Digital Optical Modules (DOMs) Measures energy deposition by shower particles

4 Simulation CORSIKA [GHEISHA-SIBYLL] Energy: [50,5000] in TeV Sampling area:  Quality cuts Edge cut Zenith < 20 o N string < 1 Beta < 6 IceTop-IceCube coincident events 16 pairs of IceTop tanks & 9 IceCube strings in 2006

5 Shower Size Lateral distribution fit S 100 depends on primary mass S 100 See Stefan Klepser's talk (HE.1.1.A, 10:54-11:06, July 9) Energy determination by Neural Network (SPASE-AMANDA analysis)

6 Muon IceTop level (~700 g/cm 2 ) by Ralph Engel by Tom Gaisser Vertical protons Minimum muon energy: 300 top of IceCube 500 bottom of IceCube

7 Charge from a shower axis to hit DOM dust layer Proton 0.5 < S 100 < 1.3 sensitive to primary mass bottom top

8 Optical Properties of Ice ScatteringAbsorption Average optical parameters: abs ~ nm sca ~ nm shallow deep shallow

9 Muons in an iron shower spread more widely than those in a proton shower, so iron showers have more late hits than proton showers Time Residuals Tail of time residual (observed - expected) distribution is fitted by exp[-  t] from 100 to 450 ns.

10 Summary - Energy estimator, S 100, depends on primary mass. Neural Network resolves the problem with additional mass-sensitive observables as demonstrated by the SPASE-AMANDA analysis (K. Andeen, et al, OG.1.2). - In addition to charge, timing information can be used to study cosmic ray composition. - Appropriate correction needs to be made for depth-dependent optical properties of ice. - Hit DOMs close to the shower axis may be best suited for this analysis. - Coincident data taken in 2007 are being analysed (52 tanks).

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04/05 1 IceCube string 8 IceTop tanks 05/06 10 IceCube strings 24 IceTop tanks 06/07 12 IceCube strings 24 IceTop tanks