tyce deyoung penn state university for the icecube collaboration june 22, 2007 icecube recent...
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![Page 1: Tyce DeYoung Penn State University for the IceCube Collaboration June 22, 2007 IceCube Recent Results and Prospects Rome International Conference on Astroparticle](https://reader035.vdocument.in/reader035/viewer/2022070415/56649ec75503460f94bd36f2/html5/thumbnails/1.jpg)
June 22, 2007
Tyce DeYoung Penn State University
for the IceCube Collaboration
IceCubeRecent Results and Prospects
Rome International Conference on Astroparticle Physics
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The IceCube CollaborationThe IceCube CollaborationUniversity of Alaska, AnchorageUniversity of California, BerkeleyUniversity of California, IrvineClark-Atlanta UniversityUniversity of Delaware / Bartol
Research InstituteUniversity of KansasLawrence Berkeley Natl. LaboratoryUniversity of MarylandPennsylvania State UniversitySouthern University and A&M
CollegeUniversity of Wisconsin, MadisonUniversity of Wisconsin, River Falls
RWTH AachenDESY, ZeuthenUniversität DortmundMPIfK HeidelbergHumboldt Universität, BerlinUniversität MainzBUGH Wuppertal
Stockholms UniversitetUppsala Universitet
Vrije Universiteit BrusselUniversité Libre de
BruxellesUniversiteit GentUniversité de Mons-
Hainaut
Chiba University
University of Canterbury, Christchurch
Universiteit Utrecht
Oxford University
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June 22, 2007RICAP 2007 Tyce DeYoung
OutlineOutline
• The IceCube Detector– Design– Construction Status
• Recent Results– AMANDA– IceCube
• Scientific Prospects
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AMANDA
Eiffel Tower
Svenska DagbladetDigital Optical Module
(DOM)
currently instrumentedIceCubeIceCube
4800 DOMs on 80 strings
160 Ice-Cherenkov tank surface array (IceTop)
Surrounds existing AMANDA detector (677 OMs)
22 strings deployed in 3 construction seasons
IceTop
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June 22, 2007RICAP 2007 Tyce DeYoung
The Digital Optical Module (DOM)The Digital Optical Module (DOM)
• Onboard capture of PMT waveforms– 300 MHz for ~400 ns with custom chip– 40 MHz for 6.4 µsec with comm. fast ADC
• Absolute timing resolution < 2 ns (RMS)• Dynamic range ~1000 p.e./10 ns• Deadtime < 1%• Noise rate ~700 Hz (260 Hz w/ artif. deadtime)• Failure rate < 1%
• Onboard capture of PMT waveforms– 300 MHz for ~400 ns with custom chip– 40 MHz for 6.4 µsec with comm. fast ADC
• Absolute timing resolution < 2 ns (RMS)• Dynamic range ~1000 p.e./10 ns• Deadtime < 1%• Noise rate ~700 Hz (260 Hz w/ artif. deadtime)• Failure rate < 1%
Digitized Waveform
20
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IceTopIceTop
See talk by Tilo WaldenmaierSee talk by Tilo Waldenmaier
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June 22, 2007RICAP 2007 Tyce DeYoung
IceCube + AMANDAIceCube + AMANDA• Densely
instrumented “Inner Core”
• Lower energy threshold
• 7 IceCube + 18 AMANDA strings
• 225 DOMs + 540 OMs
• Outer IceCube strings form veto volume
InnerCore
veto
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IceCube Construction StatusIceCube Construction Status
AMANDA 01/ 2000
IceCube string and IceTop station 01/06
IceTop station only 2006
21
3029
40
50
3938
4748
49
595857
6667
74
65
73
78
46
56
72
IceCube string and IceTop station 01/05
IceCube string and IceTop station 02/07
2004/05: 12005/06: 82006/07: 13 (12 planned)2007/08: 142008/09: 142009/10: 142010/11: 11+
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Drilling Performance 2007Drilling Performance 2007
Drill dow
n
Ream
hole
40 hours!
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June 22, 2007RICAP 2007 Tyce DeYoung
Integrated ExposureIntegrated Exposure
• 1 km3∙yr by early 2009
• Close to 4 km3∙yr after one year of operations with full detector
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
2005 2006 2007 2008 2009 2010 2011 2012
Date
0
10
20
30
40
50
60
70
80
km3·yr Strings
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
2005 2006 2007 2008 2009 2010 2011 2012
Date
0
10
20
30
40
50
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km3·yr Strings
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June 22, 2007RICAP 2007 Tyce DeYoung
OutlineOutline
• The IceCube Detector– Design– Construction Status
• Recent Results– AMANDA (See talk by Kirsten Münich)– IceCube
• Scientific Prospects
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June 22, 2007RICAP 2007 Tyce DeYoung
AMANDA Atmospheric NeutrinosAMANDA Atmospheric Neutrinos
preliminary
K. Münich
Limit based on only 2000 data:
E2 <2.6·10-7 GeV/cm2s
sr
Unfolded neutrino energy spectrum
based on observed muon
energies
(807 days)
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AMANDA Sky Map
Random events
2000-2004 data
Significance /
Significance /
69 out of 100 sky maps with randomized events
show an excess higher than3.7
4282 neutrino candidates selected
purity 95%
Achterberg et al. 2007, astro-ph/0611063
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event selection optimized for both dN/dE ~E-2 and E-3 spectra
source
nr. of events
(5 years)
expectedbackground
(5 years)
E-2 flux upper limit (90% c.l.)
[10-11 TeV-1 cm-2 s-1]
Markarian 421 6 7.4 7.4
M87 6 6.1 8.7
1ES 1959+650 5 4.8 13.5
SS433 4 6.1 4.8
Cygnus X-3 7 6.5 11.8
Cygnus X-1 8 7.0 13.2
Crab Nebula 10 6.7 17.8
3C 273 8 4.72 18.0
No significant excess observed
Search for neutrinos from 32 candidate sourcesSearch for neutrinos from 32 candidate sources
crab
Mk421Mk501
M87
Cyg-X3
1ES1959
Cyg-X1
SS433
3C273
€
μ +τ
1.2equiv.
(randommaps) Achterberg
et al. 2007,astro-ph/ 0611063
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IceCube Neutrino ObservationsIceCube Neutrino Observations
• 9-string data (2006)
• Cosmic ray background seen with weak cuts
• Atmospheric neutrinos seen with strong cuts
• Agreement in event rate over 6 decades
Final Cuts
cosmic ray m
uonsatmos. neutrinos
Achterberg et al. astro-ph/0705.1781
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June 22, 2007RICAP 2007 Tyce DeYoung
IceCube-9 NeutrinosIceCube-9 Neutrinos• Residual background near
horizon (~10% of total set)• Peaks in azimuth along
detector long axis
Zenith Angle
Azimuth
Achterberg et al. astro-ph/0705.1781
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June 22, 2007RICAP 2007 Tyce DeYoung
OutlineOutline
• The IceCube Detector– Design– Construction Status
• Recent Results– AMANDA– IceCube
• Scientific Prospects
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W-B
IceCube 1 yr
AMANDA 2000-03
Achterberg et al., astro-ph/0705.1315
Diffuse Neutrino FluxesDiffuse Neutrino Fluxes
AMANDA UHE 2000-02 (prelim)
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June 22, 2007RICAP 2007 Tyce DeYoung
Point Source SensitivityPoint Source Sensitivity
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T. Montaruli
IceCube 1 yr
AMANDA 2000-4
ANTARES 1 yr
MACRO:astro-ph/ 0002492
AMANDA: astro-ph/ 0611063
ANTARES (binned):E. Carmona, Ph.D. thesis
IceCube:astro-ph/ 0305196
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June 22, 2007RICAP 2007 Tyce DeYoung
IceCube Muon ResponseIceCube Muon Response
• Simulations and analysis techniques based on AMANDA
• Big improvements possible – waveforms, more hits, better noise reduction, reconstruction techniques
cos
Aef
f / k
m2
cos
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Muon Energy ResolutionMuon Energy Resolution
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0.3 in log10(E)
low stochastic loss rate – use muon range?
saturation – can
be correctednew method
Zornoza, Chirkin et al. ICRC 2007
total charge
Nchannels
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June 22, 2007RICAP 2007 Tyce DeYoung
Extremely High EnergiesExtremely High Energies
5 year search for muon events depositing more than 10 PeV in the detector
Detector response not yet included!
S. Yoshida et al. astro-ph/0312078
GZK (hard, strong evol.) Kalashev et al. 2002GZK (standard) Yoshida & Teshima ’93TD - Sigl et al. 1999Z-burst – Yoshida et al. 1998
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A Distant GRB
HAWC
IceCube
γ, ν
ν
Swift, GLAST, HETE, etc.)
Timing/localization from satellites & ground-based detectors for neutrino
searches
Neutrinos from GRBs, AGN, and supernovae
ROTSE
IceCube alerts to TeV ACTs, robotic optical telescopes?
MAGIC
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June 22, 2007RICAP 2007 Tyce DeYoung
MeV Supernova NeutrinosMeV Supernova Neutrinos
DOM counts integrated over 10s
Significance of observation vs distance
IceCube
AMANDA
Visibility out to Large Magellanic Cloud (~5 signal)
Signal at LMC:52 kpc
L. Köpke
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AMANDA
Eiffel Tower
Svenska Dagbladet
New CapabilitiesNew Capabilities IceTop
• IceCube will be a factor of ~60 larger than AMANDA (instr. volume)
• Better events, not just more events– Fully contained,
well away from edge of detector
– More of event observed
AMANDA
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June 22, 2007RICAP 2007 Tyce DeYoung
Low Energy PhysicsLow Energy Physics
5400IceCube
only
8200 incl.
AMANDA
Preliminary
Atmos. μ per 200 days(trigger level,
IC22+AMANDA)
Gross et al. ICRC 2007
30 GeV!
Akhmedov, Maltoni & Smirnov, hep-ph/0612285
102
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Indirect WIMP detectionIndirect WIMP detection
Sun
Krauss, Srednicki & Wilczek, ’86 Gaisser, Steigman & Tilav, ’86
Silk, Olive and Srednicki, ’85Gaisser, Steigman & Tilav, ’86Freese, ’86
μ
Detector
μ
velocitydistribution
scatt
capture
annihilation
interactions
int. μ int.
→ cc ,bb ,tt ,τ+τ−,W±,Z0,H±H0
annihilation channels
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June 22, 2007RICAP 2007 Tyce DeYoung
Solar WIMP SensitivitySolar WIMP Sensitivity
AMANDAlimits (144
days, 2001):
astro-ph/0508518
current AMANDA
limits
soft decay spectrum
hard spectrum
Expected sensitivity with IC22 + AMANDA
Expected sensitivity
for 1/2 year: Lic. thesis,
G. Wikström
Preliminary
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Prompt Neutrino FluxPrompt Neutrino Flux
Muon neutrinosElectron neutrinos
“prompt” neutrinosfrom charm decay
“prompt” neutrinosfrom charm decay
T. Montaruli
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June 22, 2007RICAP 2007 Tyce DeYoung
Tau Neutrino DetectionTau Neutrino Detection
• Negligible intrinsic tau neutrino flux from accelerated hadrons
• Oscillations over astrophysical distances lead to flavor equality (we think)
• Essentially zero physics background to astrophysical tau neutrinos at relevant energies
« 1 yr-1 above 1 PeV (TDY, Razzaque & Cowen 2007)
– Only background is misidentified events
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June 22, 2007RICAP 2007 Tyce DeYoung
Tau Neutrino SignaturesTau Neutrino Signatures
τ
τ
ττ decay
N“Double Bang”
Learned & Pakvasahep-ph/9405296
τ
τ“Lollipop”
Beacom et al.hep-ph/0307025
τ
μ “Sugar Daddy”TDY, Razzaque
& Cowenastro-ph/0608486
τ decay
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June 22, 2007RICAP 2007 Tyce DeYoung
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June 22, 2007RICAP 2007 Tyce DeYoung
Energy Windows by FlavorEnergy Windows by Flavor
(supernovæ)showers vs. tracks
full flavor ID
Neutrino flavor
μ
τ
e
Log10(Energy/eV)12 18156 219
e
Expect 1:1:1 from oscillations – if not…?
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June 22, 2007RICAP 2007 Tyce DeYoung
Beyond IceCube?Beyond IceCube?
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Besson et al., astro-ph/0512604
Effective volumes and number of GZK neutrinos detected per year
(ESS flux)
Very low attenuation of radio, acoustic waves in ice
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June 22, 2007RICAP 2007 Tyce DeYoung
I Didn’t Have Time to Talk About…I Didn’t Have Time to Talk About…• Cosmic ray composition • Diffuse extraterrestrial neutrino fluxes• Sources of ultrahigh energy cosmic rays• Neutrino point sources (AGN, microquasars, magnetars,
SNRs,…)• Neutrinos from GRBs (afterglow, precursors, choked
GRBs, neutrons)• Ultrahigh energy cosmogenic neutrinos (GZK
interactions)• Non-neutralino dark matter (Kaluza-Klein, sleptons,…)• Neutrino oscillations (13)• Tests of Lorentz invariance, weak equivalence principle• Exotic massive particles (topological defects, relic
particles)• TeV-scale extra dimensions, electroweak instantons,…• Magnetic monopoles, nuclearites, Q-balls,…• Fundamental physics with flavor ratios
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June 22, 2007RICAP 2007 Tyce DeYoung
ConclusionsConclusions
• IceCube construction is going well– On target for completion in 2011
• 22 IceCube strings now deployed, working well and taking data
• AMANDA analysis is continuing– Now integrated into IceCube
• First IceCube physics papers are starting to appear
• Stay tuned!