|Location||Amundsen–Scott South Pole Station|
|Related media on Wikimedia Commons|
The IceCube Neutrino Observatory (or simply IceCube) is a neutrino observatory constructed at the Amundsen–Scott South Pole Station in Antarctica. The project is a recognized CERN experiment (RE10). Its thousands of sensors are located under the Antarctic ice, distributed over a cubic kilometre.
Similar to its predecessor, the Antarctic Muon And Neutrino Detector Array (AMANDA), IceCube consists of spherical optical sensors called Digital Optical Modules (DOMs), each with a photomultiplier tube (PMT) and a single-board data acquisition computer which sends digital data to the counting house on the surface above the array. IceCube was completed on 18 December 2010.
DOMs are deployed on strings of 60 modules each at depths between 1,450 and 2,450 meters into holes melted in the ice using a hot water drill. IceCube is designed to look for point sources of neutrinos in the TeV range to explore the highest-energy astrophysical processes.
IceCube is part of a series of projects developed and supervised by the University of Wisconsin–Madison. Collaboration and funding are provided by numerous other universities and research institutions worldwide. Construction of IceCube was only possible during the Antarctic austral summer from November to February, when permanent sunlight allows for 24-hour drilling. Construction began in 2005, when the first IceCube string was deployed and sufficient data was collected to verify that the optical sensors functioned correctly. In the 2005–2006 season, an additional eight strings were deployed, making IceCube the largest neutrino telescope in the world.
|Season||Strings Installed||Total Strings|
The IceCube Neutrino Observatory is composed of several sub-detectors in addition to the main in-ice array.
- AMANDA, the Antarctic Muon And Neutrino Detector Array, was the first part built, and it served as a proof-of-concept for IceCube. AMANDA was turned off in May 2009.
- The IceTop array is a series of Cherenkov detectors on the surface of the glacier, with two detectors approximately above each IceCube string. IceTop is used as a cosmic ray shower detector, for cosmic ray composition studies and coincident event tests: if a muon is observed going through IceTop, it cannot be from a neutrino interacting in the ice.
- The Deep Core Low-Energy Extension is a densely instrumented region of the IceCube array which extends the observable energies below 100 GeV. The Deep Core strings are deployed at the center (in the surface plane) of the larger array, deep in the clearest ice at the bottom of the array (between 1760 and 2450 m deep). There are no Deep Core DOMs between 1850 m and 2107 m depth, as the ice is not as clear in those layers.
PINGU (Precision IceCube Next Generation Upgrade) is a proposed extension that will allow detection of low energy neutrinos (GeV energy scale), with uses including determining the neutrino mass hierarchy, precision measurement of atmospheric neutrino oscillation (both tau neutrino appearance and muon neutrino disappearance), and searching for WIMP annihilation in the Sun. A vision has been presented for a larger observatory, IceCube-Gen2.
Neutrinos are electrically neutral leptons, and interact very rarely with matter. When they do react with the molecules of water in the ice, they can create charged leptons (electrons, muons, or taus). These charged leptons can, if they are energetic enough, emit Cherenkov radiation. This happens when the charged particle travels through the ice faster than the speed of light in the ice, similar to the bow shock of a boat traveling faster than the waves it crosses. This light can then be detected by photomultiplier tubes within the digital optical modules making up IceCube.
The signals from the PMTs are digitized and then sent to the surface of the glacier on a cable. These signals are collected in a surface counting house, and some of them are sent north via satellite for further analysis. Since 2014, hard drives rather than tape store the balance of the data which is sent north once a year via ship. Once the data reaches experimenters, they can reconstruct kinematical parameters of the incoming neutrino. High-energy neutrinos may cause a large signal in the detector, pointing back to their origin. Clusters of such neutrino directions indicate point sources of neutrinos.
IceCube is more sensitive to muons than other charged leptons, because they are the most penetrating and thus have the longest tracks in the detector. Thus, of the neutrino flavors, IceCube is most sensitive to muon neutrinos. An electron resulting from an electron neutrino event typically scatters several times before losing enough energy to fall below the Cherenkov threshold; this means that electron neutrino events cannot typically be used to point back to sources, but they are more likely to be fully contained in the detector, and thus they can be useful for energy studies. These events are more spherical, or "cascade"-like, than "track"-like; muon neutrino events are more track-like.
Tau leptons can also create cascade events; but are short-lived and cannot travel very far before decaying, and are thus usually indistinguishable from electron cascades. A tau could be distinguished from an electron with a "double bang" event, where a cascade is seen both at the tau creation and decay. This is only possible with very high energy taus. Hypothetically, to resolve a tau track, the tau would need to travel at least from one DOM to an adjacent DOM (17 m) before decaying. As the average lifetime of a tau is 2.9×10−13 s, a tau traveling at near the speed of light would require 20 TeV of energy for every meter traveled. Realistically, an experimenter would need more space than just one DOM to the next to distinguish two cascades, so double bang searches are centered at PeV scale energies. Such searches are underway but have not so far isolated a double bang event from background events.
There is a large background of muons created not by neutrinos from astrophysical sources but by cosmic rays impacting the atmosphere above the detector. There are about 106 times more cosmic ray muons than neutrino-induced muons observed in IceCube. Most of these can be rejected using the fact that they are traveling downwards. Most of the remaining (up-going) events are from neutrinos, but most of these neutrinos are from cosmic rays hitting the far side of the Earth; some unknown fraction may come from astronomical sources, and these neutrinos are the key to IceCube point source searches. Estimates predict the detection of about 75 upgoing neutrinos per day in the fully constructed IceCube detector. The arrival directions of these astrophysical neutrinos are the points with which the IceCube telescope maps the sky. To distinguish these two types of neutrinos statistically, the direction and energy of the incoming neutrino is estimated from its collision by-products. Unexpected excesses in energy or excesses from a given spatial direction indicate an extraterrestrial source.
Point sources of high energy neutrinos
A point source of neutrinos could help explain the mystery of the origin of the highest energy cosmic rays. These cosmic rays have energies high enough that they cannot be contained by galactic magnetic fields (their gyroradii are larger than the radius of the galaxy), so they are believed to come from extra-galactic sources. Astrophysical events which are cataclysmic enough to create such high energy particles would probably also create high energy neutrinos, which could travel to the Earth with very little deflection, because neutrinos interact so rarely. IceCube could observe these neutrinos: its observable energy range is about 100 GeV to several PeV. The more energetic an event is, the larger volume IceCube may detect it in; in this sense, IceCube is more similar to Cherenkov telescopes like the Pierre Auger Observatory (an array of Cherenkov detecting tanks) than it is to other neutrino experiments, such as Super-K (with inward-facing PMTs fixing the fiducial volume).
IceCube is more sensitive to point sources in the northern hemisphere than in the southern hemisphere. It can observe astrophysical neutrino signals from any direction, but neutrinos coming from the direction of the southern hemisphere are swamped by the cosmic-ray muon background. Thus, early IceCube point source searches focus on the northern hemisphere, and the extension to southern hemisphere point sources takes extra work.
Although IceCube is expected to detect very few neutrinos (relative to the number of photons detected by more traditional telescopes), it should have very high resolution with the ones that it does find. Over several years of operation, it could produce a flux map of the northern hemisphere similar to existing maps like that of the cosmic microwave background, or gamma ray telescopes, which use particle terminology more like IceCube. Likewise, KM3NeT could complete the map for the southern hemisphere.
IceCube scientists may have detected their first neutrinos on January 29, 2006.
Gamma-ray bursts coincident with neutrinos
When protons collide with one another or with photons, the result is usually pions. Charged pions decay into muons and muon neutrinos whereas neutral pions decay into gamma rays. Potentially, the neutrino flux and the gamma ray flux may coincide in certain sources such as gamma-ray bursts and supernova remnants, indicating the elusive nature of their origin. Data from IceCube is being used in conjunction with gamma-ray satellites like Swift or Fermi for this goal. IceCube has not observed any neutrinos in coincidence with gamma ray bursts, but is able to use this search to constrain neutrino flux to values less than those predicted by the current models.
Indirect dark matter searches
Weakly interacting massive particle (WIMP) dark matter could be gravitationally captured by massive objects like the Sun and accumulate in the core of the Sun. With a high enough density of these particles, they would annihilate with each other at a significant rate. The decay products of this annihilation could decay into neutrinos, which could be observed by IceCube as an excess of neutrinos from the direction of the Sun. This technique of looking for the decay products of WIMP annihilation is called indirect, as opposed to direct searches which look for dark matter interacting within a contained, instrumented volume. Solar WIMP searches are more sensitive to spin-dependent WIMP models than many direct searches, because the Sun is made of lighter elements than direct search detectors (e.g. xenon or germanium). IceCube has set better limits with the 22 string detector (about 1⁄4 of the full detector) than the AMANDA limits.
IceCube can observe neutrino oscillations from atmospheric cosmic ray showers, over a baseline across the Earth. It is most sensitive at ~25 GeV, the energy range for which the DeepCore sub-array has been optimized. DeepCore consists of 6 strings deployed in the 2009–2010 austral summer with a closer horizontal and vertical spacing. In 2014, DeepCore data was used to determine the mixing angle θ23. As more data is collected and IceCube can refine this measurement, it may be possible to also observe the characteristic modification of the oscillation pattern at ~15 GeV that determines the neutrino mass hierarchy. This mechanism for determining the mass hierarchy only works as the mixing angle θ13 is large.
Despite the fact that individual neutrinos expected from supernovae have energies well below the IceCube energy cutoff, IceCube could detect a local supernova. It would appear as a detector-wide, brief, correlated rise in noise rates. The supernova would have to be relatively close (within our galaxy) to get enough neutrinos before the 1/r2 distance dependence took over. IceCube is a member of the Supernova Early Warning System (SNEWS).
A signature of sterile neutrinos would be a distortion of the energy spectrum of atmospheric neutrinos around 1 TeV, for which IceCube is uniquely positioned to search. This signature would arise from matter effects as atmospheric neutrinos interact with the matter of the Earth.
The described detection strategy, along with its South Pole position, could allow the detector to provide the first robust experimental evidence of extra dimensions predicted in string theory. Many extensions of the Standard Model of particle physics, including string theory, propose a sterile neutrino; in string theory this is made from a closed string. These could leak into extra dimensions before returning, making them appear to travel faster than the speed of light. An experiment to test this may be possible in the near future. Furthermore, if high energy neutrinos create microscopic black holes (as predicted by some aspects of string theory) it would create a shower of particles, resulting in an increase of "down" neutrinos while reducing "up" neutrinos.
In 2016, scientists at the IceCube detector did not find any evidence for the sterile neutrino.
The IceCube collaboration has published flux limits for neutrinos from point sources, gamma-ray bursts, and neutralino annihilation in the Sun, with implications for WIMP-proton cross section
A shadowing effect from the Moon has been observed. Cosmic ray protons are blocked by the Moon, creating a deficit of cosmic ray shower muons in the direction of the Moon. A small (under 1%) but robust anisotropy has been observed in cosmic ray muons.
A pair of high energy neutrinos were detected in 2013. Possibly of astrophysical origin, they were in the peta-electron volt range, making them the highest energy neutrinos discovered to date. The pair were nicknamed "Bert" and "Ernie", after characters from the Sesame Street TV show. An even more energetic neutrino was discovered in 2013 and given the name "Big Bird".
IceCube measured 10–100 GeV atmospheric muon neutrino disappearance in 2014, using 3 years of data taken May 2011 to April 2014, including DeepCore, determining neutrino oscillation parameters ∆m232 = 2.72+0.19
−0.20 × 10−3eV2 and sin2(θ23) = 0.53+0.09
−0.12 (normal mass hierarchy), comparable to other results.
In July 2018, the IceCube Neutrino Observatory announced that they have traced an extremely-high-energy neutrino that hit their detector in September 2017 back to its point of origin in the blazar TXS 0506 +056 located 5.7 billion light-years away in the direction of the constellation Orion. This is the first time that a neutrino detector has been used to locate an object in space, and indicates that a source of cosmic rays has been identified.
- Antarctic Muon And Neutrino Detector Array
- Radio Ice Cherenkov Experiment
- ANTARES and KM3NeT, similar neutrino telescopes using deep-sea water instead of ice.
- Abbasi, R; Ackermann, M; Adams, J; Ahlers, M; Ahrens, J; Andeen, K; Auffenberg, J; Bai, X; Baker, M; Barwick, S. W; Bay, R; Bazo Alba, J. L; Beattie, K; Becka, T; Becker, J. K; Becker, K. -H; Berghaus, P; Berley, D; Bernardini, E; Bertrand, D; Besson, D. Z; Bingham, B; Blaufuss, E; Boersma, D. J; Bohm, C; Bolmont, J; Böser, S; Botner, O; Braun, J; et al. (30 June 2009). "IceCube: Extreme Science!". Nuclear Instruments and Methods in Physics Research A. 601 (3): 294–316. arXiv:0810.4930. Bibcode:2009NIMPA.601..294A. doi:10.1016/j.nima.2009.01.001. S2CID 119261334. Archived from the original on 14 March 2010. Retrieved 2009-10-15.
- "Recognized Experiments at CERN". The CERN Scientific Committees. CERN. Retrieved 21 January 2020.
- "RE10/ICECUBE : IceCube". The CERN Experimental Programme. CERN. Retrieved 21 January 2020.
- R. Abbasi; et al. (IceCube Collaboration) (2010). "Calibration and Characterization of the IceCube Photomultiplier Tube". Nuclear Instruments and Methods A. 618 (1–3): 139–152. arXiv:1002.2442. Bibcode:2010NIMPA.618..139A. doi:10.1016/j.nima.2010.03.102. S2CID 44013013.
- R. Abbasi; et al. (IceCube Collaboration) (2009). "The IceCube Data Acquisition System: Signal Capture, Digitization, and Timestamping". Nuclear Instruments and Methods A. 601 (3): 294–316. arXiv:0810.4930. Bibcode:2009NIMPA.601..294A. doi:10.1016/j.nima.2009.01.001. S2CID 119261334.
- IceCube Neutrino Observatory
- IceCube Collaboration (2013). "Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector". Science. 342 (6161): 1242856. arXiv:1311.5238. Bibcode:2013Sci...342E...1I. doi:10.1126/science.1242856. PMID 24264993. S2CID 27788533.
- IceCube Collaborating Organizations
- K. Hutchison (24 October 2005). "IceCube - One hole done, 79 more to go" (Press release). SpaceRef.com. Retrieved 2009-10-15.
- "Archived copy". Archived from the original on 2010-12-25. Retrieved 2011-01-09.CS1 maint: archived copy as title (link)
- World's largest neutrino observatory completed at South Pole (Dec. 17, 2010)
- "Frequently Asked Questions".
- Aartsen, M. G.; et al. (2013). "Measurement of South Pole ice transparency with the IceCube LED calibration system". Nuclear Instruments and Methods in Physics Research A. 711 (73): 73–89. arXiv:1301.5361. Bibcode:2013NIMPA.711...73A. doi:10.1016/j.nima.2013.01.054. S2CID 118683026.
- "IceCube looks to the future with PINGU". 30 Dec 2013.
- Aartsen, M. G.; et al. (Icecube-Gen2 Collaboration) (18 Dec 2014). "IceCube-Gen2: A Vision for the Future of Neutrino Astronomy in Antarctica". arXiv:1412.5106 [astro-ph.HE].
- F. Halzen (June 2002). "IceCube: A Kilometer-Scale Neutrino Observatory" (PDF). Archived from the original (PDF) on September 9, 2006. Retrieved 2009-10-15.
- Speed of light (299792458 m/s) �� average lifetime (2.9×10−13 s) = 8.711×10−5 m
- R. Abbasi; et al. (IceCube Collaboration) (2009). "Extending the Search for Neutrino Point Sources with IceCube above the Horizon". Physical Review Letters. 103 (22): 221102. arXiv:0911.2338. Bibcode:2009PhRvL.103v1102A. doi:10.1103/PhysRevLett.103.221102. hdl:2440/76771. PMID 20366087. S2CID 43304371.
- K. Mizoguchi (17 February 2006). "Scientists find first neutrinos in 'IceCube' project". USA Today. Retrieved 2009-10-15.
- R. Abbasi; et al. (IceCube Collaboration) (2011). "Limits on Neutrino Emission from Gamma-Ray Bursts with the 40 String IceCube Detector". Physical Review Letters. 106 (14): 141101. arXiv:1101.1448. Bibcode:2011PhRvL.106n1101A. doi:10.1103/PhysRevLett.106.141101. PMID 21561178. S2CID 19816817.
- R. Abbasi; et al. (IceCube Collaboration) (2010). "Limits on a muon flux from Kaluza-Klein dark matter annihilations in the Sun from the IceCube 22-string detector". Physical Review D. 81 (5): 057101. arXiv:0910.4480. Bibcode:2010PhRvD..81e7101A. doi:10.1103/PhysRevD.81.057101. S2CID 2111669.
- K. Scholberg (2008). "The SuperNova Early Warning System". Astronomische Nachrichten. 329 (3): 337–339. arXiv:0803.0531. Bibcode:2008AN....329..337S. doi:10.1002/asna.200710934. S2CID 15986602.
- M. Chown (22 May 2006). "At last, a way to test time travel". New Scientist. Retrieved 2009-10-15.
- "South Pole Neutrino Detector Could Yield Evidences of String Theory". PhysOrg.com. 26 January 2006.
- Castelvecchi, Davide (8 August 2016). "Icy telescope throws cold water on sterile neutrino theory". Nature. doi:10.1038/nature.2016.20382. S2CID 125498830. Retrieved 30 August 2018.
- Abbasi, R.; et al. (IceCube Collaboration) (2009). "First neutrino point-source results from the 22 string Icecube Detector". Astrophysical Journal Letters. 701 (1): L47–L51. arXiv:0905.2253. Bibcode:2009ApJ...701L..47A. doi:10.1088/0004-637X/701/1/L47. S2CID 55074376.
- Taboada, I. (2009). "Searches for neutrinos from GRBs with IceCube". AIP Conference Proceedings. 1133: 431–433. Bibcode:2009AIPC.1133..431T. doi:10.1063/1.3155942.
- Abbasi, R.; et al. (IceCube Collaboration) (2009). "Limits on a muon flux from neutralino annihilations in the Sun with the IceCube 22 string detector". Physical Review Letters. 102 (20): 201302. arXiv:0902.2460. Bibcode:2009PhRvL.102t1302A. doi:10.1103/PhysRevLett.102.201302. hdl:2440/76774. PMID 19519015. S2CID 32876823.
- Hand, E. (3 May 2009). "APS 2009: The muon shadow of the Moon". blogs.nature.com/news/blog/. Retrieved 2009-10-15.
- Boersma, D.; Gladstone, L.; Karle, A. (2009). "Moon shadow observation by IceCube". Proceedings of the 31st International Cosmic Ray Conference. Łódź, Poland. arXiv:1002.4900. Bibcode:2010arXiv1002.4900B.
- Abbasi, R.; Desiati, P.; Díaz Vélez, J.C. (2009). "Large scale cosmic ray anisotropy with IceCube". Proceedings of the 31st International Cosmic Ray Conference. Łódź, Poland. arXiv:0907.0498. Bibcode:2009arXiv0907.0498A.
- Aartsen, M.G.; et al. (IceCube Collaboration) (2013). "Evidence for high-energy extraterrestrial neutrinos at the IceCube Detector". Science. 342 (6161): 1242856. arXiv:1311.5238. Bibcode:2013Sci...342E...1I. doi:10.1126/science.1242856. PMID 24264993. S2CID 27788533.
- Devorsky, G. (26 April 2013). "Neutrinos from another galaxy have been discovered in Antarctica". i09.com. Retrieved 2013-12-29.
- Aartsen, M.G.; et al. (IceCube Collaboration) (2014). "Observation of high-energy astrophysical neutrinos in three years of IceCube data". Physical Review Letters. 113 (10): 101101. arXiv:1405.5303. Bibcode:2014PhRvL.113j1101A. doi:10.1103/PhysRevLett.113.101101. PMID 25238345. S2CID 220469354.
- "Big Bird joins Bert and Ernie". 2013-11-27.
- Aartsen, M.G.; et al. (IceCube Collaboration) (2015). "Determining neutrino oscillation parameters from atmospheric muon neutrino disappearance with three years of IceCube DeepCore data". Physical Review D. 91 (7): 072004. arXiv:1410.7227. Bibcode:2015PhRvD..91g2004A. doi:10.1103/PhysRevD.91.072004. S2CID 53073393.
- Aartsen, M.G.; et al. (The IceCube Collaboration, Fermi-LAT, MAGIC, AGILE, ASAS-SN, HAWC, H.E.S.S., INTEGRAL, Kanata, Kiso, Kapteyn, Liverpool Telescope, Subaru, Swift/NuSTAR, VERITAS, VLA/17B-403 teams) (12 July 2018). "Multimessenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A". Science. 361 (6398): eaat1378. arXiv:1807.08816. Bibcode:2018Sci...361.1378I. doi:10.1126/science.aat1378. PMID 30002226. S2CID 49734791.
- Aartsen, M.G.; et al. (IceCube Collaboration) (12 July 2018). "Neutrino emission from the direction of the blazar TXS 0506+056 prior to the IceCube-170922A alert". Science. 361 (6398): 147–151. arXiv:1807.08794. Bibcode:2018Sci...361..147I. doi:10.1126/science.aat2890. PMID 30002248.
- Overbye, Dennis (12 July 2018). "It came from a black hole, and landed in Antarctica - for the first time, astronomers followed cosmic neutrinos into the fire-spitting heart of a supermassive blazar". The New York Times. Retrieved 13 July 2018.
- "Neutrino that struck Antarctica traced to galaxy 3.7 bn light years away". The Guardian. 12 July 2018. Retrieved 12 July 2018.
- "Source of cosmic 'ghost' particle revealed". BBC News. 12 July 2018. Retrieved 12 July 2018.
- Aartsen, M.G.; et al. (IceCube Collaboration) (2021-03-10). "Detection of a particle shower at the Glashow resonance with IceCube" (PDF). Nature. 591 (7849): 220–224. Bibcode:2021Natur.591..220I. doi:10.1038/s41586-021-03256-1. hdl:1854/LU-8705937. PMID 33692563. S2CID 232188780.
|Wikimedia Commons has media related to IceCube Neutrino Observatory.|