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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
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detectors, clustered in three locations within 1.9 km (1.2 mi) of six nuclear reactors. Each detector consists of 20 tons of liquid scintillator (
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has about a 50% probability of being sensitive to the neutrino mass hierarchy. Experiments may also be able to probe CP violation among neutrinos.
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F. P. An et al. (Daya Bay
Collaboration) (2023). "Precision Measurement of Reactor Antineutrino Oscillation at Kilometer-Scale Baselines by Daya Bay".
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The collaboration produced an updated analysis of their results in 2014, which used the energy spectrum to improve the bounds on the mixing angle:
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This significant result represents a new type of oscillation and is surprisingly large. It is consistent with earlier, less significant results by
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Daya Bay has used its data to search for signals of a light sterile neutrino, resulting in exclusions of some previous unexplored mass regions.
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An, F.P.; et al. (Daya Bay
Collaboration) (12 February 2016). "Measurement of the reactor antineutrino flux and spectrum at Daya Bay".
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649:{\displaystyle \sin ^{2}(2\ \theta _{13})=0.084\pm 0.005,\qquad |\Delta m_{ee}^{2}|=2.44_{-0.11}^{+0.10}\times 10^{-3}{\rm {eV}}^{2}}
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791:{\displaystyle \sin ^{2}(2\ \theta _{13})=0.0851\pm 0.0024,\qquad \Delta m_{32}^{2}=(2.466\pm 0.060)\times 10^{-3}{\rm {eV}}^{2}}
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in the foreseeable future and be crucial to the investigation of the mass hierarchy and CP violation in neutrino oscillation."
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At the
Moriond 2015 physics conference a new best fit for mixing angle and mass difference was presented:
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305:{\displaystyle \sin ^{2}(2\ \theta _{13})=0.092\pm 0.016\,\mathrm {(stat)} \pm 0.005\,\mathrm {(syst)} .}
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Bei-Zhen Hu; et al. (14 May 2015). "Recent
Results from Daya Bay Reactor Neutrino Experiment".
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83:(Republic of China), Russia, and the Czech Republic. The US side of the project is funded by the
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1513:"Announcing the First Results from Daya Bay: Discovery of a New Kind of Neutrino Transformation"
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1532:"Spectral measurement of electron antineutrino oscillation amplitude and frequency at Daya Bay"
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An independent measurement was also published using events from neutrons captured on hydrogen:
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79:. The multinational collaboration includes researchers from China, Chile, the United States,
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On 21 April 2023 (published), Daya Bay's reports the following precision measurements:
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reactor neutrino experiment & Aberdeen cosmic ray muon-induced neutron experiment"
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880:{\displaystyle \Delta m_{32}^{2}=-(2.571\pm 0.060)\times 10^{-3}{\rm {eV}}^{2}}
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1052:. Department of Physics. The Chinese University of Hong Kong. Archived from
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413:{\displaystyle \sin ^{2}(2\ \theta _{13})=0.090_{-0.009}^{+0.008}}
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1407:"Observation of electron-antineutrino disappearance at Daya Bay"
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1301:"A side-by-side comparison of Daya Bay antineutrino detectors"
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Daya Bay II: Jiangmen
Underground Neutrino Observatory (JUNO)
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On 8 March 2012, the Daya Bay collaboration announced a
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A much larger follow-up is in development in the form of the
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which may affect the Daya Bay
Reactor Neutrino Experiment.
483:{\displaystyle \sin ^{2}(2\ \theta _{13})=0.083\pm 0.018}
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Science and technology in the People's
Republic of China
1597:"Independent measurement of the neutrino mixing angle
1487:"Neutrino oscillations measured with record precision"
176:. Scientists are also interested in whether neutrinos
1472:"Physicists in China Nail a Key Neutrino Measurement"
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using antineutrinos produced by the reactors of the
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1661:"Search for a Light Sterile Neutrino at Daya Bay"
94:, approximately 52 kilometers northeast of
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16:Particle physics experiment studying neutrinos
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1265:University of Science and Technology of China
8:
1604:via neutron capture on hydrogen at Daya Bay"
159:and is designed to measure the mixing angle
106:in Hong Kong. The Aberdeen lab measures the
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2630:BNO (Baksan or Baxan Neutrino Observatory)
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1260:University of Illinois at Urbana–Champaign
932:{\displaystyle \sin ^{2}(2\ \theta _{13})}
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102:. There is an affiliated project in the
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979:of particle physics needs improvement.
1299:Daya Bay collaboration (22 May 2012).
104:Aberdeen Tunnel Underground Laboratory
1485:Eugenie Samuel Reich (8 March 2012).
1161:Lawrence Berkeley National Laboratory
7:
1165:University of California at Berkeley
1151:Joint Institute for Nuclear Research
61:Daya Bay Reactor Neutrino Experiment
1106:China Guangdong Nuclear Power Group
1517:University of California, Berkeley
1240:University of California at Irvine
1225:Sun Yat-Sen (Zhongshan) University
1091:California Institute of Technology
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178:violate Charge-Parity conservation
87:'s Office of High Energy Physics.
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2594:Long Baseline Neutrino Experiment
120:The experiment consists of eight
1200:Rensselaer Polytechnic Institute
1141:Institute of High Energy Physics
1136:Illinois Institute of Technology
1131:Dongguan Institute of Technology
1111:China Institute of Atomic Energy
1101:Chengdu University of Technology
798:for the normal mass ordering or
1405:Daya Bay Collaboration (2012).
1121:Chinese University of Hong Kong
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98:and 45 kilometers east of
1814:10.1103/PhysRevLett.116.061801
1769:10.1103/PhysRevLett.130.161802
1695:10.1103/PhysRevLett.113.141802
1566:10.1103/PhysRevLett.112.061801
1441:10.1103/PhysRevLett.108.171803
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1081:Brookhaven National Laboratory
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55:One of the Daya Bay detectors.
1:
1911:Lederman–Schwartz–Steinberger
1210:Shanghai Jiao Tong University
1020:"Catching neutrinos in China"
2671:Reactor neutrino experiments
2650:List of neutrino experiments
1086:Catholic University of Chile
959:{\displaystyle \theta _{13}}
170:Daya Bay Nuclear Power Plant
2681:Nuclear technology in China
1470:Adrian Cho (8 March 2012).
1356:Li, Xiaonan (August 2013).
1126:College of William and Mary
1116:Chinese Academy of Sciences
174:Ling Ao Nuclear Power Plant
2702:
1638:10.1103/PhysRevD.90.071101
1335:10.1016/j.nima.2012.05.030
1190:National United University
1185:National Taiwan University
1499:10.1038/nature.2012.10202
1076:Beijing Normal University
2686:Underground laboratories
1381:"Groundbreaking at JUNO"
1784:Physical Review Letters
1747:Physical Review Letters
1536:Physical Review Letters
1411:Physical Review Letters
1367:Windows On the Universe
1270:University of Wisconsin
1250:University of Hong Kong
155:The experiment studies
85:US Department of Energy
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1385:Interactions NewsWire
1255:University of Houston
1146:Iowa State University
970:Antineutrino spectrum
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157:neutrino oscillations
151:Neutrino oscillations
134:photomultiplier tubes
77:neutrino oscillations
67:-based multinational
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1965:Neutrino oscillation
1195:Princeton University
1012:"Daya Bay home page"
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37:22.5953°N 114.5431°E
2635:Kamioka Observatory
1806:2016PhRvL.116f1801A
1687:2014PhRvL.113n1802A
1630:2014PhRvD..90g1101A
1558:2014PhRvL.112f1801A
1433:2012PhRvL.108q1803A
1327:2012NIMPA.685...78A
1235:Tsinghua University
1215:Shenzhen University
1205:Shandong University
1156:Kurchatov Institute
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2116:ICARUS (Fermilab)
1515:(Press release).
1387:. 10 January 2015
1230:Temple University
1175:Nankai University
1024:Symmetry Magazine
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71:project studying
42:22.5953; 114.5431
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2543:Neutrino Factory
2296:Hyper-Kamiokande
2059:Super-Kamiokande
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1519:. 8 March 2012.
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1474:. ScienceNow.
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1220:Siena College
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1069:Collaborators
1068:
1056:on 2007-05-10
1055:
1051:
1046:
1040:
1030:on 2007-09-27
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88:
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78:
74:
70:
66:
62:
53:
49:
46:
2599:NEMO Project
2357:Double Chooz
2264:Construction
2079:
1996:Astronomical
1884:Cowan–Reines
1787:
1783:
1777:
1750:
1746:
1740:
1719:
1668:
1664:
1654:
1611:
1608:Phys. Rev. D
1607:
1598:
1590:
1539:
1535:
1525:
1507:
1490:
1480:
1465:
1414:
1410:
1400:
1389:. Retrieved
1384:
1375:
1358:
1351:
1311:(1): 78–97.
1308:
1304:
1294:
1058:. Retrieved
1054:the original
1044:
1032:. Retrieved
1028:the original
1023:
973:
661:
658:
496:
493:
422:
340:
328:
325:Double Chooz
314:
188:
182:
161:
154:
138:
122:antineutrino
119:
110:produced by
89:
60:
58:
18:
2205:KamLAND-Zen
2104:Accelerator
1982:(divided by
1877:Discoveries
128:doped with
40: /
28:114°32′35″E
2665:Categories
2422:Kamiokande
2377:Gargamelle
2281:Baikal-GVD
2136:NA61/SHINE
2121:MicroBooNE
1797:1607.05378
1760:2211.14988
1753:: 161802.
1731:1505.03641
1391:2015-01-12
1287:References
1060:2007-04-27
1043:"Daya Bay
1034:2006-11-15
334:so large,
194:≠ 0, with
143:(JUNO) in
130:gadolinium
25:22°35′43″N
2577:Cancelled
2397:Homestake
2347:Cuoricino
2311:SuperNEMO
2131:MiniBooNE
1980:Operating
1678:1407.7259
1621:1406.6468
1549:1310.6732
1424:1203.1669
1318:1202.6181
948:θ
918:θ
905:
853:−
845:×
836:±
827:−
806:Δ
764:−
756:×
747:±
720:Δ
710:±
692:θ
679:
622:−
614:×
598:−
564:Δ
549:±
531:θ
518:
475:±
457:θ
444:
395:−
375:θ
362:
273:±
246:±
228:θ
215:
96:Hong Kong
73:neutrinos
2623:See also
2568:WATCHMAN
2518:JEM-EUSO
2501:Proposed
2487:Soudan 2
2477:SciBooNE
2210:MAJORANA
2160:Collider
2080:Daya Bay
2024:Borexino
1986:neutrino
1822:26918980
1711:10500157
1703:25325631
1646:14698730
1574:24580686
1457:16580300
1449:22680853
989:Neutrino
983:See also
172:and the
108:neutrons
100:Shenzhen
92:Daya Bay
2548:Nucifer
2367:EXO-200
2320:Retired
2276:ARIANNA
2172:SND@LHC
2126:MINERνA
2085:KamLAND
2073:Reactor
2039:IceCube
2009:ANTARES
1988:source)
1984:primary
1970:SN 1987
1830:8567768
1802:Bibcode
1683:Bibcode
1626:Bibcode
1582:7332532
1554:Bibcode
1429:Bibcode
1343:7471018
1323:Bibcode
327:. With
145:Kaiping
2645:SNOLAB
2589:LAGUNA
2533:LEGEND
2452:MINOS+
2427:KARMEN
2402:ICARUS
2372:GALLEX
2327:AMANDA
2306:KM3NeT
2246:KATRIN
2220:PandaX
2095:STEREO
1955:τ
1950:ν
1928:μ
1923:ν
1896:ν
1828:
1820:
1709:
1701:
1644:
1580:
1572:
1491:Nature
1455:
1447:
1341:
914:
713:0.0024
707:0.0851
688:
527:
453:
371:
224:
112:cosmic
81:Taiwan
2614:BOREX
2553:P-ONE
2523:GRAND
2508:CUPID
2467:OPERA
2447:MINOS
2442:MACRO
2382:GERDA
2352:DONUT
2337:Chooz
2251:WITCH
2239:Other
2230:XMASS
2200:CUORE
2195:COBRA
2190:AMoRE
2167:FASER
2111:ANNIE
2064:SNEWS
2049:NEVOD
2019:BDUNT
2004:ANITA
1938:DONUT
1826:S2CID
1792:arXiv
1755:arXiv
1726:arXiv
1707:S2CID
1673:arXiv
1642:S2CID
1616:arXiv
1578:S2CID
1544:arXiv
1453:S2CID
1419:arXiv
1363:(PDF)
1339:S2CID
1313:arXiv
839:0.060
833:2.571
750:0.060
744:2.466
552:0.005
546:0.084
478:0.018
472:0.083
406:0.008
398:0.009
391:0.090
321:MINOS
276:0.005
249:0.016
243:0.092
115:muons
65:China
63:is a
2640:LNGS
2558:SBND
2538:LENA
2513:nEXO
2492:Utah
2472:RICE
2462:NEMO
2457:NARC
2437:LSND
2407:IGEX
2362:ERPM
2342:CNGS
2332:CDHS
2301:JUNO
2291:DUNE
2286:BEST
2225:SNO+
2215:NEXT
2182:0νββ
2146:NuMI
2141:NOvA
2090:RENO
2054:SAGE
2034:HALO
2029:BUST
1818:PMID
1699:PMID
1570:PMID
1445:PMID
1163:and
609:0.10
601:0.11
594:2.44
336:NOνA
323:and
185:5.2σ
59:The
2609:SOX
2563:UNO
2528:INO
2482:SNO
2432:KGF
2417:K2K
2412:IMB
2387:GNO
2271:ARA
2151:T2K
2044:LVD
2014:ASD
1810:doi
1788:116
1765:doi
1751:130
1691:doi
1669:113
1634:doi
1562:doi
1540:112
1495:doi
1437:doi
1415:108
1331:doi
1309:685
896:sin
670:sin
509:sin
435:sin
353:sin
317:T2K
206:sin
2667::
1824:.
1816:.
1808:.
1800:.
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1435:.
1427:.
1413:.
1409:.
1383:.
1365:.
1337:.
1329:.
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1307:.
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952:13
922:13
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814:32
760:10
728:32
696:13
618:10
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319:,
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180:.
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1940:(
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1913:(
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908:(
900:2
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830:(
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682:(
674:2
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469:=
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329:θ
300:.
296:)
293:t
290:s
287:y
284:s
281:(
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266:t
263:a
260:t
257:s
254:(
240:=
237:)
221:2
218:(
210:2
189:θ
162:θ
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
