First measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msub><mml:mrow><mml:mi>θ</mml:mi></mml:mrow><mml:mrow><mml:mn>13</mml:mn></mml:mrow></mml:msub></mml:math> from delayed neutron capture on hydrogen in the Double Chooz experiment

Abe, Yoshihisa; Aberle, Christoph; Anjos, J. C. dos; Barrière, J. C.; Bergevin, M.; Bernstein, Adam; Bezerra, T. J. C.; Bezrukhov, L.; Blucher, E.; Bowden, N. S.; Buck, C.; Busenitz, J.; Cabrera, A.; Caden, E.; Camilleri, L.; Carr, R.; Cerrada, M.; Chang, Philip; Chimenti, P.; Classen, T.; Collin, A. P.; Conover, Emily; Conrad, J. M.; Crespo-Anadón, J. I.; Crum, K.; Cucoanes, A. S.; Damon, E.; Dawson, J.; Dazeley, S.; Dietrich, Dennis D.; Djurcic, Z.; Dracos, M.; Durand, V.; Ebert, J.; Efremenko, Y.; Elnimr, M.; Erickson, Anna; Etenko, A.; Fallot, M.; Fechner, M.; Feilitzsch, F. von; Felde, J.; Fernandes, S. M.; Fischer, V.; Franco, D.; Franke, A. J.; Franke, M.; Furuta, H.; Gama, R. Goncalves; Gil-Botella, I.; Giot, L.; Göger‐Neff, M.; Gonzalez, L. F. G.; Goodenough, L.; Goodman, M. C.; Goon, J. Tm.; Greiner, D.; Haag, N.; Habib, S.; Hagner, C.; Hara, T.; Hartmann, F.; Haser, J.; Hatzikoutelis, A.; Hayakawa, Takehito; Hofmann, M.; Horton-Smith, G. A.; Hourlier, A.; Ishitsuka, M.; Jochum, J.; Jollet, C.; Jones, C. L.; Kaether, F.; Kalousis, Leonidas; Kamyshkov, Y.; Kaplan, Daniel M.; Kawasaki, T.; Keefer, G.; Kemp, E.; Kerret, H. de; Konno, T.; Kryn, D.; Kuze, M.; Lachenmaier, T.; Lane, C.; Langbrandtner, C.; Lasserre, T.; Letourneau, A.; Lhuillier, D.; Lima, H. P.; Lindner, M.; López-Castaño, J. M.; LoSecco, J. M.; Лубсандоржиев, Б.; Lucht, S.; McKee, D.; Maeda, J.; Maesano, Cara Nichole; Mariani, C.; Maricic, J.; Martino, J.; Matsubara, Takahiko; Mention, G.; Meregaglia, A.; Meyer, Michael; Miletic, T.; Milinčić, R.; Miyata, H.; Mueller, Th A.; Nagasaka, Y.; Nakajima, K.; Novella, P.; Obolensky, M.; Oberauer, L.; Onillón, A.; Osborn, A.; Ostrovskiy, I.; Palomares, C.; Pepe, I. M.; Perasso, S.; Perrin, Paul B.; Pfahler, P.; Porta, A.; Potzel, W.; Pronost, G.; Reichenbacher, J.; Reinhold, B.; Remoto, A.; Röhling, M.; Roncin, R.; Roth, Stefan; Rybolt, B.; Sakamoto, Y.; Santorelli, R.; Sato, F.; Schönert, S.; Schoppmann, S.; Schwetz, Thomas; Shaevitz, M. H.; Shimojima, S.; Shrestha, Deepak; Sida, J. L.; Sinev, V. V.; Skorokhvatov, M.; Smith, E.; Spitz, J.; Stahl, A.; Stancu, I.; Stokes, L. F. F.; Strait, M.; Stüken, A.; Suekane, F.; Sukhotin, S.; Sumiyoshi, T.; Sun, Y. Z.; Svoboda, R.; Terao, K.; Tonazzo, A.; Toups, M.; Thi, H. H. Trinh; Valdiviesso, G. A.; Veyssiére, C.; Wagner, S. J.; Watanabe, H.; White, B.; Wiebusch, C. H.; Winslow, L. A.; Worcester, M.; Wurm, M.; Yermia, F.; Zimmer, V.

doi:10.1016/j.physletb.2013.04.050

Cited by 96 publications

(31 citation statements)

References 13 publications

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“…They use gadolinium-doped liquid scintillator to identify electron antineutrinos through inverse β-decay (IBD) reactions (ν e + p → n + e + ) with the neutron capturing on gadolinium (nGd). A surrounding volume of undoped liquid scintillator improves the efficiency of detecting γ's that escape from the doped volume, and has been used (in conjunction with the doped volume) by each of the three reactor experiments to determine sin 2 2θ 13 independently through IBD reactions with the neutron captured by hydrogen (nH) [14,15,22,23]. The KamLAND experiment has used nH IBDs to measure the disappearance of reactor ν e [24] and the flux of geo-ν e [25].…”

Section: Introductionmentioning

confidence: 99%

New measurement ofθ13via neutron capture on hydrogen at Daya Bay

An¹,

Balantekin²,

Band³

et al. 2016

Phys. Rev. D

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This article reports an improved independent measurement of neutrino mixing angle θ13 at the Daya Bay Reactor Neutrino Experiment. Electron antineutrinos were identified by inverse β-decays with the emitted neutron captured by hydrogen, yielding a data-set with principally distinct uncertainties from that with neutrons captured by gadolinium. With the final two of eight antineutrino detectors installed, this study used 621 days of data including the previously reported 217-day data set with six detectors. The dominant statistical uncertainty was reduced by 49%. Intensive studies of the cosmogenic muon-induced 9 Li and fast neutron backgrounds and the neutron-capture energy selection efficiency, resulted in a reduction of the systematic uncertainty by 26%. The deficit in the detected number of antineutrinos at the far detectors relative to the expected number based on the near detectors yielded sin 2 2θ13 = 0.071 ± 0.011 in the three-neutrino-oscillation framework. The combination of this result with the gadolinium-capture result is also reported.

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Section: Introductionmentioning

confidence: 99%

New measurement ofθ13via neutron capture on hydrogen at Daya Bay

An¹,

Balantekin²,

Band³

et al. 2016

Phys. Rev. D

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show abstract

“…± 0.034(syst.) [24]. Based on 468 live days of data, an improved measurement was made to obtain sin 2 (2 13 ) = 0.09 ± 0.03 [25].…”

Section: Results On Neutrino Mixing Angle 13mentioning

confidence: 99%

Review of Reactor Neutrino Experiments

Kim

2015

Proceedings of the 2nd International Symposium on Science at J-Parc — Unlocking the Mysteries of Life, Matter and the Universe

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New generation of reactor neutrino experiments, Daya Bay and RENO, have made definitive measurements of the smallest neutrino mixing angle  13 in 2012, based on the disappearance of electron antineutrinos. More precise measurements of the mixing angle and reactor neutrino spectra have been made and presented. A rather large value of  13 has opened a new window to find the CP violation phase and to determine the neutrino mass hierarchy. Future reactor experiments, JUNO and RENO-50, are proposed to determine the neutrino mass hierarchy and to make highly precise measurements of  12 m 21 2 , andm 31 2 

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“…A new analysis based on neutron captures on hydrogen was published [6] providing for the first time a measurement of θ 13 using this technique. Given the fact that H and Gd neutrino candidates are disjoint samples, their corresponding θ 13 measurements have been combined, considering all correlated terms such as the flux, response and detection systematics, to obtain a more precise measurement of θ 13 [7].…”

Section: Single-detector Analysesmentioning

confidence: 99%

Latest results from Double Chooz

Botella¹

2017

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2017)

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Double Chooz (DC) is a reactor neutrino experiment running at the Chooz nuclear power plant in France. In 2011, DC first reported indication of non-zero θ 13 neutrino mixing angle with the far detector (FD) located at the maximum of oscillation effects. A robust observation of θ 13 followed in 2012 by other reactor experiments with multiple detector configurations. In the DC single detector configuration, the precision of θ 13 was totally dominated by the reactor flux uncertainty. Since 2015 DC runs in a multi-detector configuration reducing strongly the impact of several otherwise dominating systematics. Due to the unique almost iso-flux site configuration, the DC near detector (ND) becomes a direct accurate non-oscillation reference to the FD. The most recent DC θ 13 measurement with two detectors uses a novel analysis method aimed to maximize the accuracy; i.e. the goodness of the central value of θ 13 . Despite a major increase of statistical power, a conservative approach on systematics has been adopted for now. The latest multi-detector DC θ 13 value presents a deviation with respect to the world average. The combined "reactor-θ 13 " measurement is expected to remain as the world reference for decades, relying on systematic uncertainties in the per mil level. Thus, the redundancy of multiple experiments is critical to ensure the accuracy and precision of the measurement, which is reference for current and future projects sensitive to CP-violation and atmospheric mass hierarchy observables. Beyond oscillation physics, DC has articulated one of the most precise single-detector setups, allowing high precision reactor spectrum characterization, including both shape and normalization. This is a particularly hot topic since DC provided the first evidence of a sizeable reactor neutrino spectral distortion in May 2014, confirmed later on by other experiments, questioning the accuracy and precision of today's reactor neutrino predictions technology.

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First measurement of θ13 from delayed neutron capture on hydrogen in the Double Chooz experiment

Cited by 96 publications

References 13 publications

New measurement ofθ13via neutron capture on hydrogen at Daya Bay

New measurement ofθ13via neutron capture on hydrogen at Daya Bay

Review of Reactor Neutrino Experiments

Latest results from Double Chooz

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