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Daya Bay Reactor Neutrino Experiment

daya bay reactor neutrino experiment
Coordinates: 22°35′43″N 114°32′35″E / 225953°N 1145431°E / 225953; 1145431

One of the Daya Bay detectors

The Daya Bay Reactor Neutrino Experiment is a China-based multinational particle physics project studying neutrinos The multinational collaboration includes researchers from China, Chile, the United States, Taiwan, Russia, and the Czech Republic The US side of the project is funded by the US Department of Energy's Office of High Energy Physics

It is situated at Daya Bay, approximately 52 kilometers northeast of Hong Kong and 45 kilometers east of Shenzhen There is an affiliated project in the Aberdeen Tunnel Underground Laboratory in Hong Kong The Aberdeen lab measures the neutrons produced by cosmic muons which may affect the Daya Bay Reactor Neutrino Experiment

The experiment consists of eight antineutrino detectors, clustered in three locations within 19 km 12 mi of six nuclear reactors Each detector consists of 20 t of liquid scintillator linear alkylbenzene doped with gadolinium surrounded by photomultiplier tubes and shielding[1]

A much larger follow-up is in development in the form of the Jiangmen Underground Neutrino Observatory JUNO in Kaiping,[2] which will use an acrylic sphere filled with 20,000 t of liquid scintillator to detect reactor antineutrinos Groundbreaking began 10 January 2015, with operation expected in 2020[3]

Contents

  • 1 Neutrino oscillations
  • 2 Antineutrino spectrum
  • 3 See also
  • 4 External links
  • 5 Collaborators
  • 6 References

Neutrino oscillations

The experiment studies neutrino oscillations and is designed to measure the mixing angle θ13 using antineutrinos produced by the reactors of the Daya Bay Nuclear Power Plant and the Ling Ao Nuclear Power Plant Scientists are also interested in whether neutrinos violate Charge-Parity conservation

On 8 March 2012, the Daya Bay collaboration announced[4][5][6] a 52 σ discovery of θ13 ≠ 0, with

sin 2 ⁡ 2   θ 13 = 0092 ± 0016 s t a t ± 0005 s y s t 2\ \theta _=0092\pm 0016\,\mathrm \pm 0005\,\mathrm }

This significant result represents a new type of oscillation and is surprisingly large[7] It is consistent with earlier, less significant results by T2K, MINOS and Double Chooz With θ13 so large, NOνA has about a 50% probability of being sensitive to the neutrino mass hierarchy Experiments may also be able to probe CP violation among neutrinos

The collaboration produced an updated analysis of their results in 2014,[8] which used the energy spectrum to improve the bounds on the mixing angle:

sin 2 ⁡ 2   θ 13 = 0090 − 0009 + 0008 2\ \theta _=0090_^}

An independent measurement was also published using events from neutrons captured on hydrogen:[9]

sin 2 ⁡ 2   θ 13 = 0083 ± 0018 2\ \theta _=0083\pm 0018}

Daya Bay has used its data to search for signals of a light sterile neutrino, resulting in exclusions of some previous unexplored mass regions[10]

At the Moriond 2015 physics conference a new best fit for mixing angle and mass difference was presented:[11]

sin 2 ⁡ 2   θ 13 = 0084 ± 0005 , | Δ m e e 2 | = 244 − 11 + 10 × 10 − 3 e V 2 2\ \theta _=0084\pm 0005,\qquad |\Delta m_^|=244_^\times 10^}^}

Antineutrino spectrum

Daya Bay Collaboration measured the anti-neutrino energy spectrum, and found that anti-neutrinos at an energy of around 5 MeV are in excess relative to theoretical expectations This unexpected disagreement between observation and predictions suggested that the Standard model of particle physics needs improvement[12]

See also

  • Neutrino
  • Sterile neutrino
  • Weak interaction

External links

  • "Daya Bay home page" 
  • "Catching neutrinos in China" Symmetry Magazine 
  • "Daya Bay θ13 reactor neutrino experiment & Aberdeen cosmic ray muon-induced neutron experiment" Department of Physics The Chinese University of Hong Kong 

Collaborators

  • Beijing Normal University
  • Brookhaven National Laboratory
  • Catholic University of Chile
  • California Institute of Technology
  • Charles University
  • Chengdu University of Technology
  • China Guangdong Nuclear Power Group
  • China Institute of Atomic Energy
  • Chinese Academy of Sciences
  • Chinese University of Hong Kong
  • College of William and Mary
  • Dongguan Institute of Technology
  • Illinois Institute of Technology
  • Institute of High Energy Physics
  • Iowa State University
  • Joint Institute for Nuclear Research
  • Kurchatov Institute
  • Lawrence Berkeley National Laboratory and University of California at Berkeley
  • Nanjing University
  • Nankai University
  • National Chiao-Tung University
  • National Taiwan University
  • National United University
  • Princeton University
  • Rensselaer Polytechnic Institute
  • Shandong University
  • Shanghai Jiao Tong University
  • Shenzhen University
  • Siena College
  • Sun Yat-Sen Zhongshan University
  • Temple University
  • Tsinghua University
  • University of California at Los Angeles
  • University of Hong Kong
  • University of Houston
  • University of Illinois at Urbana-Champaign
  • University of Science and Technology of China
  • University of Wisconsin
  • Yale University
  • Virginia Polytechnic Institute and State University

References

  1. ^ Daya Bay collaboration 22 May 2012 "A side-by-side comparison of Daya Bay antineutrino detectors" PDF Nuclear Instruments and Methods in Physics Research A 685 1: 78–97 arXiv:12026181  Bibcode:2012NIMPA68578A doi:101016/jnima201205030 
  2. ^ Li, Xiaonan August 2013 Daya Bay II: Jiangmen Underground Neutrino Observatory JUNO PDF Windows On the Universe 
  3. ^ "Groundbreaking at JUNO" Interactions NewsWire 10 January 2015 Retrieved 2015-01-12 
  4. ^ Daya Bay Collaboration 2012 "Observation of electron-antineutrino disappearance at Daya Bay" Physical Review Letters 108 17: 171803 arXiv:12031669  Bibcode:2012PhRvL108q1803A doi:101103/PhysRevLett108171803 PMID 22680853 
  5. ^ Adrian Cho 8 March 2012 "Physicists in China Nail a Key Neutrino Measurement" ScienceNow 
  6. ^ Eugenie Samuel Reich 8 March 2012 "Neutrino oscillations measured with record precision" Nature doi:101038/nature201210202  
  7. ^ "Announcing the First Results from Daya Bay: Discovery of a New Kind of Neutrino Transformation" Press release University of California, Berkeley 8 March 2012 
  8. ^ Daya Bay Collaboration 10 February 2014 "Spectral measurement of electron antineutrino oscillation amplitude and frequency at Daya Bay" Physical Review Letters 112 6: 061801 arXiv:13106732  Bibcode:2014PhRvL112f1801A doi:101103/PhysRevLett112061801 PMID 24580686 
  9. ^ Daya Bay Collaboration 3 October 2014 "Independent measurement of the neutrino mixing angle θ13 via neutron capture on hydrogen at Daya Bay" Phys Rev D 90 7: 071101 arXiv:14066468  Bibcode:2014PhRvD90g1101A doi:101103/PhysRevD90071101 
  10. ^ Daya Bay Collaboration 1 October 2014 "Search for a Light Sterile Neutrino at Daya Bay" Phys Rev Lett 113 14: 141802 arXiv:14077259  Bibcode:2014PhRvL113n1802A doi:101103/PhysRevLett113141802 
  11. ^ Bei-Zhen Hu; et al 14 May 2015 "Recent Results from Daya Bay Reactor Neutrino Experiment" arXiv:150503641   
  12. ^ An, FP; et al Daya Bay Collaboration 12 February 2016 "Measurement of the reactor antineutrino flux and spectrum at Daya Bay" Physical Review Letters 116 6: 061801 arXiv:160705378  Bibcode:2016PhRvL116f1801A doi:101103/PhysRevLett116061801 PMID 26918980 

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    29.10.2014


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