Aspen Institute for Physics 02 Francis Halzen • the sky > 10 GeV photon energy • > 108 TeV particles exist Fly’s Eye/Hires • they should.
Download ReportTranscript Aspen Institute for Physics 02 Francis Halzen • the sky > 10 GeV photon energy • > 108 TeV particles exist Fly’s Eye/Hires • they should.
Aspen Institute for Physics 02 Francis Halzen • the sky > 10 GeV photon energy < 10-14 cm wavelength • > 108 TeV particles exist Fly’s Eye/Hires • they should not • more/better data arrays of air Cherenkov telescopes 104 km2 air shower arrays ~ km3 neutrino detectors CMB Radio Visible GeV g-rays Flux Energy (eV) 1 TeV With 103 TeV energy, photons do not reach us from the edge of our galaxy because of their small mean free path in the microwave background. g + gCMB + e + e / / / / / / TeV sources! / / / cosmic / / rays / / / / / / n Acceleration to 1021eV? ~102 Joules ~ 0.01 MGUT dense regions with exceptional gravitational force creating relativistic flows of charged particles, e.g. •annihilating black holes/neutron stars •dense cores of exploding stars •supermassive black holes Cosmic Accelerators E ~ GcBR R~ 2 GM/c energy magnetic field E ~ GBM boost factor mass Supernova shocks expanding in interstellar medium Crab nebula Active Galaxies: Jets 20 TeV gamma rays Higher energies obscured by IR light VLA image of Cygnus A Gamma Ray Burst E~GBM E> •quasars •blasars •neutron stars black holes .. •grb 19 10 eV ? G @ 1 B @ 103G M @ 109 Msun > ~ 10 G @ 1 B @ 1012G M @ Msun > ~ 102 emit highest energy g’s! Particles > 1020 eV ? •not protons new astrophysics? cannot reach us from cosmic accelerators lint < 50 Mpc no diffusion in magnetic fields doublets, triplet trouble for top-down scenarios •not photons g + Bearth e+ + e- not seen showers not muon-poor •not neutrinos snp @ 10-5 spp no air snp @ spp with showers TeV - gravity unitarity? Particles > 1020 eV ? •not protons new astrophysics? cannot reach us from cosmic accelerators lint < 50 Mpc no diffusion in magnetic fields doublets, triplet trouble for top-down scenarios •not photons g + Bearth e+ + e- not seen showers not muon-poor •not neutrinos snp @ 10-5 spp no air snp @ spp with showers TeV - gravity unitarity? TeV-Scale Gravity Modifies PeV Neutrino Cross Sections! 103 TeV The Oldest Problem in Astronomy: • No accelerator • No particle candidate (worse than dark matter!) • Not photons (excludes extravagant particle physics ideas) What Now? black hole radiation enveloping black hole neutrinos associates with the source of the cosmic rays? even neutrons do not escape neutrons escape Radiation field: Ask astronomers Produces cosmic ray beam neutrinos associates with the source of the cosmic rays? even neutrons do not escape neutrons escape •Infrequently, a cosmic neutrino is captured in the ice, i.e. the neutrino interacts with an ice nucleus •In the crash a muon (or electron, or tau) is produced Cherenkov muon light cone Detector •The muon radiates blue light in its wake •Optical sensors capture (and map) the light interaction neutrino Optical Module Photomultiplier: 10 inch Hamamatsu Active PMT base Glass sphere: Nautillus Mu metal magnetic shield Amundsen-Scott South Pole Station South Pole Optical sensor The Counting House 1.5 km Neutrino sky seen by AMANDA 40 Data 35 Atmosphericn MC 30 25 events 20 15 10 5 0 • Monte Carlo methods verified on data • ~ 300 neutrinos from 130 days of B-10 operation (Nature 410, 441, 2001) -1 -0.9 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0 cos() Cos() Atmospheric Muons and Neutrinos Lifetime: 135 days Triggered Reconstructed upgoing Pass Quality Cuts (Q ≥ 7) Observed Data Predicted Neutrinos 1,200,000,000 4574 5000 571 204 273 Search for a diffuse n-flux of astrophysical sources Method: • Assume a diffuse neutrino flux (Hypothesis), e.g.: dN/dE = 10-5*E-2/(cm2 sec GeV) • The background is the atmospheric neutrino flux (after quality cuts): ≈ 200 events • Apply energy cut. 80 70 60 50 40 30 20 10 0 Preliminary Data Atmos. MC 10 E 01 02 03 04 05 06 07 08 09 0 100 event multiplicity Compare to Mrk 501 gamma rays Field of view:Continuous 2 p ster ! AMANDA limit B10 1year only Sensitivity of 3 years of IceCube AMANDA II - the full detector 120m horizontal neutrino detection possible ...online 2001 analysis 2 recent events: October 1, 2001 October 10, 2001 ...online 2001 analysis Zenith angle comparison with signal MC atmospheric muons atmospheric n‘s real-time filtering at Pole real-time processing (Mainz) Left plot: 20 days (Sept/Oct 2001) 90 ncandidates above 100° 4.5 ncandidates / day (data/MC normalized above 100°) AMANDA II first look (16 days) Data MC Zenith angle distribution 10 8 MC energy 6 4 2 01 1.5 2 2.53 3 3.5 4 4.5 5 up to now 10% of 2000 data analysed log10(E_nu) after cuts about 5 n per day cut efficiency improved from Average energy ~ 0.3 TeV AMANDA B10 by 3-5 AMANDA: Proof of Concept • since 1992 we have deployed 24 strings with more than 750 photon detectors (basically 8-inch photomultipliers). • R&D detector for proof of concept: 375 times SuperK instrumented volume with 1.5% the total photocathode area. • IceCube: 45 times AMANDA II instrumented volume with 7 times the total photocathode area. AMANDA: Proof of Concept • 80 modules: first nus, Astropart. Phys. 13, 1, 2000 • 302 modules: 97 atmospheric neutrino analysis published; 98, 99 data analysis in progress (1-2 neutrinos per day). • 677 modules: 01, 02 data analysis in progress (>5 neutrino events per day despite higher threshold)-scaling of detector verified! • Daily nus: extract neutrinos from daily satellite transmissions. IceCube IceTop AMANDA South Pole Skiway • 80 Strings • 4800 PMT • Instrumented volume: 1 km3 (1 Gt) • IceCube is designed to 1400 m detect neutrinos of all flavors at energies from 107 eV (SN) to 1020 eV 2400 m South Pole South Pole Dark sector Skiway AMANDA Dome IceCube Planned Location 1 km east South Pole Dark sector Skiway AMANDA Dome IceCube µ-event in IceCube 300 atmospheric neutrinos per day AMANDA II IceCube: --> Larger telescope --> Superior detector 1 km WIMPs from the Sun with IceCube J. Edsjö, 2000 • Ice3 will significantly improve the sensitivity. • Sensitivity comparable to GENIUS,… Muon Events Eµ= 6 PeV Eµ= 10 TeV Measure energy by counting the number of fired PMT. (This is a very simple but robust method) ne+ e W + n 6400 TeV Cascade event ne + N --> e- + X •The length of the actual cascade, ≈ 10 m, is small compared to the spacing of sensors •roughly spherical density distribution of light •1 PeV ≈ 500 m diameter •Local energy deposition = good energy resolution of neutrino energy Energy = 375 TeV Enhanced role of tau neutrinos because of SNO discovery • Cosmic beam: ne = nµ = nt because of oscillations • nt not absorbed by the Earth (regeneration) • Pile-Up near 1 PeV where ideal sensitivity Neutrino ID (solid) Energy and angle (shaded) PeV t (300m) nt t t decays nt at E>PeV: Partially contained Photoelectron density • • • • The incoming tau radiates little light. The energy of the second bang can be measured with high precision. Clear signature Muon Brem would be much brighter than the tau (compare to the PeV muon event shown before) Result: high effective volume; only second bang seen in Ice3 Timing, realistic spacing SUMMARY • the sky > 10 GeV photon energy < 10-14 cm wavelength • > 108 TeV particles exist Fly’s Eye/Hires • they should not • more/better data arrays of air Cherenkov telescopes 104 km2 air shower arrays ~ km3 neutrino detectors The End The IceCube Collaboration Institutions: 11 US and 9 European institutions (most of them are also AMANDA member institutions) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. Bartol Research Institute, University of Delaware BUGH Wuppertal, Germany Universite Libre de Bruxelles, Brussels, Belgium CTSPS, Clark-Atlanta University, Atlanta USA DESY-Zeuthen, Zeuthen, Germany Institute for Advanced Study, Princeton, USA Dept. of Technology, Kalmar University, Kalmar, Sweden Lawrence Berkeley National Laboratory, Berkeley, USA Department of Physics, Southern University and A\&M College, Baton Rouge, LA, USA Dept. of Physics, UC Berkeley, USA Institute of Physics, University of Mainz, Mainz, Germany Dept. of Physics, University of Maryland, USA University of Mons-Hainaut, Mons, Belgium Dept. of Physics and Astronomy, University of Pennsylvania, Philadelphia, USA Dept. of Astronomy, Dept. of Physics, SSEC, PSL, University of Wisconsin, Madison, USA Physics Department, University of Wisconsin, River Falls, USA Division of High Energy Physics, Uppsala University, Uppsala, Sweden Fysikum, Stockholm University, Stockholm, Sweden University of Alabama, Tuscaloosa, USA Vrije Universiteit Brussel, Brussel, Belgium Upper limits to the muon flux from point sources 10-13 cm-2 s-1 Southern Sky Northern Sky 130 days AMANDA-B10 10-14 10 years MACRO 10-15 -90 -45 0 45 declination (degrees) 90 cosmic ray puzzle protons TeV g - rays neutrinos 3 ~ 1 km ~ •atmospheric Cherenkov high energy air shower •space-based detectors arrays •AMANDA / Ice Cube •Veritas, Hess, Magic … •Hi Res, Auger, e.g. Antares, Nestor, •GLAST… Airwatch, NEMO OWL, TA… •particle physics •short-wavelength also and cosmology study of supernova remnants and galaxies •dark matter search •discovery 104 km2 AMANDA NEUTRINO SKY