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Double Chooz

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microseconds; the distance between the vertices of the two signals should be less than 100 cm; and no other signals (except for the delayed signal) are found 200 microseconds before or 600 microseconds after the prompt signal. Detection of the prompt signal has reached nearly 100% efficiency, however it is not as easy to detect the delayed signal due to issues such as Gd-concentration and neutron scattering models.
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The inner veto surrounded the buffer vessel with a 50 cm thick layer of scintillating mineral oil. In addition, it had 78 8-inch PMTs distributed on the top, bottom and sides. This inner veto layer served as an active veto layer for muons and fast neutrons. The surrounding 15 cm thick steel
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Double Chooz used two identical gadolinium-doped liquid scintillator detectors placed in vicinity of two 4.25 GW thermal power reactors to measure antineutrino disappearance. The two detectors were referred to as "near", 400 meters from the reactor; and "far", 1,050 meters from the reactor. The far
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Since there are backgrounds to consider, candidates for (IBD) are determined by the following: visible energy from the prompt signal must be between 0.5 and 20 MeV; the delayed signal must have an energy between 4 and 10 MeV; the time difference between those two signals must be between 0.5 and 150
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oscillation hypothesis was excluded at 2.9 sigma by combining the Double Chooz experiment disappearance data and the T2K experiment appearance data, that had been released only some months before. This result became both the most important evidence at the time and the first accurate measurement of
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and had a diameter of 230 cm, a height of 245.8 cm, and a thickness of 0.8 cm. This chamber was filled with 10,000 liters of gadolinium (Gd) loaded (1 gram/liter) liquid scintillator; it was the neutrino target. The next layer out was the γ-catcher. It surrounded the neutrino target
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The buffer vessel was made of stainless steel 304L with dimensions of 552.2 cm wide by 568.0 cm tall and 0.3 cm thick. The remainder of the interior space that wasn't occupied by the acrylic double vessel was filled with a non-scintillating mineral oil. On the inner surface of the
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experiment; one of its detectors occupies the same site as its predecessor. Until January 2015 all data had been collected using only the far detector. The near detector was completed in September 2014, after construction delays, and started taking data at the beginning of 2015. Both detectors
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with a 55 cm thick layer of Gd-free liquid scintillator. The casing for the γ-catcher was 12 cm thick and made of the same material as the neutrino catcher. The materials were chosen so that both of these vessels are transparent to photons with a wavelength greater than 400 nm.
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annihilation and distorts the scintillation signal. A tagging algorithm was developed that could be used in neutrino detectors for improved background rejection, which was similarly done by Borexino for cosmogenic C background. An ortho-positronium lifetime of
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are electrically neutral, extremely light particles that only interact weakly, meaning they can travel vast distances without ever being noticed. One of the properties of neutrinos is that as the propagate they have a chance to
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reactors as a neutrino source and measured the flux of neutrinos from them. To accomplish this, Double Chooz had a set of two detectors situated 400 meters and 1050 meters from the reactors. Double Chooz was a successor to the
98:. The purpose of the buffer layer was to shield from radioactivity in the PMTs and the surrounding rock. These two layers in addition to the neutrino target and γ-catcher were collectively referred to as the "inner detector." 484: 876:) so far. A similar analysis combination technique as done by the Double Chooz experiment in 2012 has been employed by the T2K experiment to yield the first constraints on the non-zero CP-violation phase in 2020. 2710: 1205: 107:
casing further served to shield against external γ-rays. The outer veto covered the top of the detector tank. It consisted of strips with a 5 cm x 1 cm cross section laid in orthogonal directions.
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electronics with a sampling rate of 500 MHz. The trigger threshold for the detectors was set to 350 keV, much lower than the 1.02 MeV expected of the electron anti-neutrinos.
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Y, Abe; et al. (Double Chooz collaboration) (28 March 2012). "Indication for the disappearance of reactor electron antineutrinos in the Double Chooz experiment".
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detector was placed inside a hill such that there was a 300 meters of water equivalent of shielding from cosmic muons. The detector itself was a calorimetric liquid
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Abe, Y.; et al. (Double Chooz Collaboration) (December 2012). "First test of Lorentz violation with a reactor-based antineutrino experiment".
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For several years Double Chooz had operated with only the far detector and had used models such as Bugey4 to calculate the expected flux.
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significance. The central values of both Double Chooz and Daya Bay experiments were in excellent agreement and has remained so (within ≤2
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which was the best experimental upper limit for over a decade. The goal of the Double Chooz experiment is to continue to explore the
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Abe, Y.; et al. (Double Chooz Collaboration) (18 September 2012). "Reactor ν¯e disappearance in the Double Chooz experiment".
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particle. From this the value of the mixing angle can be measured from the oscillation amplitude in reactor neutrino oscillations.
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Apollonio, M.; et al. (2003). "Search for neutrino oscillations on a long base-line at the CHOOZ nuclear power station".
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Neutron capture on hydrogen was used to produce independent data, which was analysed to yield a separate measurement in 2013:
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An improved measurement with reduced background and systematic uncertainties after 467.90 days of data was published in the
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In November 2011, first results of the experiment, using 228 days of data, were presented at the LowNu conference in
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Huber, P.; et al. (2006). "From Double Chooz to Triple Chooz — Neutrino Physics at the Chooz Reactor Complex".
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Abe, Y.; et al. (Double Chooz Collaboration) (2014). "Improved measurements of the neutrino mixing angle θ
853:, followed by an article submitted to arXiv in December 2011. In the PRL article (published in 2012), the zero 2689: 2654: 2165: 2336: 1112:{\displaystyle \sin ^{2}(2\theta _{13})=0.102\pm 0.028\,\mathrm {(stat)} \pm 0.033\,\mathrm {(syst)} .} 988:{\displaystyle \sin ^{2}(2\theta _{13})=0.097\pm 0.034\,\mathrm {(stat)} \pm 0.034\,\mathrm {(syst)} .} 713: 437: 397: 2518: 2392: 2086: 1910: 1853: 1794: 1732: 1670: 1607: 1558: 1525: 1412: 1337: 1266: 475: 236: 140: 28: 2756: 2543: 2523: 2130: 1960: 303: 212: 178: 146: 2669: 2458: 2397: 2117: 1934: 1900: 1843: 1810: 1784: 1766:
Abe, Y.; et al. (Double Chooz Collaboration) (2014). "Background-independent measurement of
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Ardellier, F.; et al. (2006). "Double Chooz: A Search for the Neutrino Mixing Angle
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Ardellier, F.; et al. (2006). "Double Chooz: A Search for the Neutrino Mixing Angle
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Using reactor-off data, a background-independent measurement was published July 2014 in
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is much smaller than the other, the Double Chooz experiment only needs to consider a
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Mikaelyan, L; Sinev, V (2000). "Neutrino Oscillations at Reactors: What Is Next?".
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Abe, Y.; et al. (Double Chooz Collaboration) (2012). "First Measurement of
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from Delayed Neutron Capture on Hydrogen in the Double Chooz Experiment".
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Signals from the inner detector and the inner veto were recorded by 8-bit
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Observations of the mixing angle are accomplished by observing the
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Abe, Y.; et al. (Double Chooz Collaboration) (October 2014).
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Herve de Kerret, "First results from the Double Chooz experiment"
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flux from the reactors is about 50 per day. Because one of the
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is the length in meters the neutrino has travelled and
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Limits on Lorentz violation parameters were also set.
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was measured, compatible with other dedicated setups.
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The neutrinos from the reactor are observed via the
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The experiment used the 1976: 8: 59:stopped taking data in late December 2017. 2752:BNO (Baksan or Baxan Neutrino Observatory) 2113: 1983: 1969: 1961: 1219:formation in their detector, which delays 627: 605: 1904: 1865: 1847: 1788: 1726: 1664: 1601: 1519: 1467: 1406: 1331: 1306: 1260: 1185: 1177: 1161: 1142: 1136: 1086: 1085: 1059: 1058: 1037: 1018: 1012: 962: 961: 935: 934: 913: 894: 888: 800: 781: 770: 769: 766: 730: 719: 718: 715: 694: 688: 668: 595: 582: 568: 563: 550: 537: 532: 523: 504: 486: 454: 443: 442: 439: 414: 403: 402: 399: 366: 347: 335: 311: 305: 272: 253: 247: 220: 214: 209:, performed in the 1990s, found that the 186: 180: 148: 1495: 1493: 1491: 1489: 1487: 1485: 1483: 1481: 1479: 1450: 1448: 1446: 1444: 1442: 327:angle by probing an even smaller region 15: 1371: 7: 1215:Double Chooz was able to identify 1099: 1096: 1093: 1090: 1072: 1069: 1066: 1063: 975: 972: 969: 966: 948: 945: 942: 939: 640: 637: 634: 631: 628: 624: 621: 618: 615: 612: 609: 606: 602: 599: 556: 14: 2716:Long Baseline Neutrino Experiment 1564:"First Results from Double Chooz" 1504:with the Double Chooz detector". 846:, hinting at a non-zero value of 739:{\displaystyle {\bar {\nu }}_{e}} 472:neutrino mass-squared differences 463:{\displaystyle {\bar {\nu }}_{e}} 423:{\displaystyle {\bar {\nu }}_{e}} 80:The innermost vessel was made of 1248:The European Physical Journal C 594: 94:buffer vessel were 390 10-inch 1835:Journal of High Energy Physics 1807:10.1016/j.physletb.2014.04.045 1745:10.1016/j.physletb.2013.04.050 1620:10.1103/PhysRevLett.108.131801 1507:Journal of High Energy Physics 1319:Journal of High Energy Physics 1167: 1151: 1125:Journal of High Energy Physics 1102: 1087: 1075: 1060: 1043: 1027: 978: 963: 951: 936: 919: 903: 793: 775: 724: 643: 596: 529: 513: 448: 408: 372: 356: 278: 262: 1: 2033:Lederman–Schwartz–Steinberger 1350:10.1088/1126-6708/2006/05/072 76:Neutrino target and γ-catcher 2798:Reactor neutrino experiments 2772:List of neutrino experiments 320:{\displaystyle \theta _{13}} 229:{\displaystyle \theta _{13}} 195:{\displaystyle \theta _{13}} 168:{\displaystyle e,\mu ,\tau } 2814: 1923:10.1103/PhysRevD.86.112009 1683:10.1103/PhysRevD.86.052008 1279:10.1140/epjc/s2002-01127-9 51:Chooz Nuclear Power Plant 1395:Physics of Atomic Nuclei 703:{\displaystyle E_{\nu }} 1867:10.1007/JHEP10(2014)032 1590:Physical Review Letters 1538:10.1007/JHEP10(2014)086 126:Experimental techniques 1201: 1113: 989: 819: 740: 704: 677: 654: 476:two-flavor oscillation 464: 424: 385: 321: 291: 230: 196: 169: 89:Buffer vessel and PMTs 21: 1202: 1114: 990: 820: 741: 710:is the energy of the 705: 678: 655: 465: 425: 386: 322: 292: 231: 197: 170: 102:Inner and outer vetos 96:photomultiplier tubes 27:was a short-baseline 20:The Double Chooz logo 19: 2793:Neutrino experiments 2087:Neutrino oscillation 1382:. 25 September 2014. 1135: 1011: 887: 765: 714: 687: 667: 485: 438: 398: 334: 304: 246: 213: 179: 147: 29:neutrino oscillation 2757:Kamioka Observatory 1915:2012PhRvD..86k2009A 1858:2014JHEP...10..032A 1799:2014PhLB..735...51A 1737:2013PhLB..723...66A 1675:2012PhRvD..86e2008A 1612:2012PhRvL.108m1801A 1530:2014JHEP...10..086A 1417:2000PAN....63.1002M 1342:2006JHEP...05..072H 1271:2003EPJC...27..331A 1193: 573: 1773:in Double Chooz". 1197: 1173: 1109: 985: 815: 756:inverse beta decay 736: 700: 673: 650: 559: 460: 420: 381: 317: 287: 239:is constrained by 226: 192: 165: 47:electron neutrinos 22: 2780: 2779: 2514:Heidelberg-Moscow 2381: 2380: 2238:ICARUS (Fermilab) 1892:Physical Review D 1776:Physics Letters B 1714:Physics Letters B 1652:Physical Review D 1001:Physics Letters B 861:the amplitude of 778: 727: 676:{\displaystyle L} 588: 451: 432:fission reactions 411: 143:from one flavor ( 2805: 2665:Neutrino Factory 2418:Hyper-Kamiokande 2181:Super-Kamiokande 2114: 2081: 2080: 2079: 2071: 2070: 2054: 2053: 2052: 2044: 2043: 2027: 2026: 2025: 2017: 2016: 1985: 1978: 1971: 1962: 1956:Project Homepage 1943: 1942: 1908: 1886: 1880: 1879: 1869: 1851: 1825: 1819: 1818: 1792: 1763: 1757: 1756: 1730: 1701: 1695: 1694: 1668: 1646: 1640: 1639: 1605: 1585: 1579: 1578: 1576: 1575: 1566:. 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Index


neutrino oscillation
Chooz
θ13 mixing angle
electron neutrinos
Chooz Nuclear Power Plant
Chooz
scintillator
acrylic plastic
photomultiplier tubes
flash ADC
Neutrinos
oscillate
Chooz experiment
mixing angle
fission reactions
neutrino mass-squared differences
two-flavor oscillation
inverse beta decay
Seoul
Physics Letters B
Journal of High Energy Physics
positronium
positron
The European Physical Journal C
arXiv
hep-ex/0301017
Bibcode
2003EPJC...27..331A
doi

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