$P_{\overline{\nu}_e\rightarrow\overline{\nu}_e} = 1 - \cos^4\theta_{13}\sin^2 2\theta_{12}\sin^2\Delta_{21} - \sin^2 2\theta_{13}(\cos^2\theta_{12}\sin^2\Delta_{31} + \sin^2\theta_{12}\sin^2{\Delta_{32}}),$ ACUA: on the central axis of the detector, Argon:Freon(R134a):isobutene:SF6 = 65.5:30.0:4.0:0.5, $$^{60}$$Co, 1.17 + 1.33 MeV $$\gamma$$, 100 Hz. This article reports an improved independent measurement of neutrino mixing angle θ13 at the Daya Bay Reactor Neutrino Experiment. “This success is central to our discovery.” In search of theta 13 11.12.2020 - The Daya Bay Reactor Neutrino Experiment collaboration - which made a precise measurement of an important neutrino property eight years ago, setting the stage for a new round of experiments and discoveries about these hard-to-study particles - has finished taking data. The inclusion of nH capture results will improve the ultimate precision of Daya Bay for both θ. This page has been accessed 19,676 times. The Daya Bay collaboration’s first results indicate that sin 2 2 θ 13 is equal to 0.092 plus or minus 0.017. The Daya Bay Collaboration has recently reported its first \bar{\nu}_e \to \bar{\nu}_e oscillation result which points to \theta_{13} \simeq 8.8^\circ \pm 0.8^\circ (best-fit \pm 1\sigma range) or \theta_{13} \neq 0^\circ at the 5.2\sigma level. The inner water shield (IWS) and outer water shield (OWS) efficiencies were studied using muons going through an AD. All six cores are functionally identical, pressurized water reactors of 2.9 GW thermal power. An automated system ensures real-time delivery of raw data and databases to offline. report. About 320 raw data files, 1 GB per file, are generated per day and transferred to the computing farms. Each ACU contains a LED, as well as two sealed capsules with radioactive sources that can be lowered individually into the gadolinium-doped liquid scintillator along either the centerline, the inner edge, or in the un-doped liquid scintillator (see Figure 3). As the neutrino travels through space (in vacuum or in matter), one flavor can change into another due to quantum interference between the mass eigenstates. Too many news these days, so just a brief note on something that deserves a long article. For a single reactor core and single near and far detectors, the ratio of the number of antineutrino events with energy between $$E$$ and $$E+dE$$ detected at distance $$L_f$$ (far detector) from the reactor core to that at a distance $$L_n$$ (near detector) is given by A reactor-neutrino experiment, Daya Bay, has been proposed to determine the least-known neutrino mixing angle theta_13 using electron antineutrinos produced at the Daya Bay nuclear power complex in China. Each detector is triggered independently with a local trigger board, which can not only receive signals from each electronics board and produce physical triggers, but can also generate internal periodic triggers and software triggers. There are two optical reflectors at the top and bottom of the outer acrylic vessel that is incorporated in order to increase the optical acceptance of photons. The use of the reflectors allows us to reduce the number of PMTs by a factor of two. A reactor is a powerful neutrino source which comes free to the physicists who wish to study the neutrino's properties. e. mass-squared diﬀerence |∆m. 13. and the ¯ν. The Daya Bay reactor neutrino experiment is a multi-national project to study neutrino oscillation by using the antineutrinos released by Daya Bay Nuclear Power Plant and Lingao Nuclear Power Plant in China. The Daya Bay collaboration’s first results indicate that sin 2 2 θ 13 is equal to 0.092 plus or minus 0.017. The neutrino energy is mostly below 10 MeV. Figure 6 shows the flowchart of the offline data processing. With identical detectors, the relative detector efficiency ($$\epsilon_{\rm f} / \epsilon_{\rm n}$$) can be determined more precisely than the absolute efficiency. Full Record; Other Related Research; Abstract. When a trigger is issued, the FEE reads out the charge and timing information for each over-threshold channel, as well as the average ADC value over a 100 ns time-window immediately preceding the over-threshold condition. We measured the neutrino mixing angle, θ 13, presumably related to the preponderance of matter over antimatter in our universe with high precision. The simulation is based on GEANT4 with certain critical features validated against external data or other simulation packages, and is tuned to match the observed detector response. ). })\pm0.005({\rm syst.})\). Posted by 8 years ago. A reactor model-independent comparison of the relative antineutrino rates and energy spectra between detectors gives $$\sin^{2}2\theta_{13}=0.084\pm0.005$$, and $$|\Delta m^{2}_{\mathrm{ee}}|=2.44^{+0.10}_{-0.11}\times10^{-3} {\rm eV}^2$$. This article reports an improved independent measurement of neutrino mixing angle θ13 at the Daya Bay Reactor Neutrino Experiment. The RPC electronics employs a self-triggering scheme and reads out a digital hit map of the over-threshold channels along with a GPS time-stamp for the trigger. Approximate values of the vertical overburden in terms of meter-water-equivalent (mwe) for each hall and their distances to each nuclear power plant are given in Table 1. The Daya Bay Detector Control System (DCS) monitors and controls the experimental hardware and environment. Various flavours. Measuring $$\theta_{13}$$ with reactor antineutrinos, Laboratoire d'Annecy-le-Vieux de physique des particules, Annecy-le-Vieux, France, Fermi National Accelerator Laboratory, Batavia, Illinois, USA, Publications by members of the collaboration, http://www.scholarpedia.org/w/index.php?title=The_Daya_Bay_Experiment&oldid=148223, Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. The AD is also instrumented with two CMOS cameras and temperature sensors to monitor the liquid levels. Dr. Miao He, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China, Dr. YiFang Wang, Institute of High Energy Physics, Chinese Academy of Sciences. The Daya Bay reactor neutrino experiment is a multi-national project to study neutrino oscillation by using the antineutrinos released by Daya Bay Nuclear Power Plant and Lingao Nuclear Power Plant in China. The Daya Bay Reactor Neutrino Experiment was designed to study the oscillation of neutrinos coming from nuclear reactors and in 2012 was the first experiment to conclusively determine that $$\theta_{13}$$ is non-zero. The value of {theta}13 is vital to resolving the neutrino mass heirarchy as well as future investigation of CP violation in the lepton sector. The same is true for EH2, where the measured ratio of AD3/AD8 is 1.019±0.004, consistent with the expectation 1.012. As the Daya Bay sensitivity will ultimately be limited by detector-related systematics, understanding detector performance and identicalness will be crucial to meeting experimental goals. where $$N_{\rm p,f}$$ and $$N_{\rm p,n}$$ refer to the number of target protons at the far and near sites, respectively. Three automated calibration units (ACU-A, ACU-B, and ACU-C) are mounted at the top of the stainless steel tank. A RPC module in Daya Bay is constructed from four layers of bare RPCs. The FADC samples and records the unshaped energy sum at 1 GHz. Daya Bay is an international collaboration with institutions from China, the United States, the Czech Republic, Hong Kong, Russia, and Taiwan. The distances between each detector and the reactor cores were thus determined to a precision of 18 mm. Each AD has three nested cylindrical volumes separated by concentric acrylic vessels as shown in Figure 3. 20 ton. Er betrifft die Umwandlung des Elektronneutrinos in andere Typen. 10:113011, 2008) and where $$\theta_{13}=\theta_{13… Daya Bay is an international collaboration with institutions from China, the United States, the Czech Republic, Hong Kong, Russia, and Taiwan. 21 ton. The maximum oscillation driven by \(\Delta m_{21}^2$$ appears at around 60 kilometers, while $$\Delta m_{31}^2$$ dominates the oscillation at distances on the order of a kilometer. \left [\frac{P_{\rm sur}(E,L_{\rm f},\theta_{13})}{P_{\rm sur}(E,L_{\rm n},\theta_{13})}\right], \] The number of photoelectrons collected by the PMTs was found to be around 160 per MeV of visible energy in each AD, and the energy resolution was $$(7.5/\sqrt{E(MeV)}+0.9)\%$$. An alternative Lightweight Analysis Framework was designed and implemented to improve the analysis efficiency. The FEE in turn sends the number of channels over threshold and the integrated charge to the local trigger board (LTB) as well as to the flash ADC (FADC) board. Credit: Roy Kaltschmidt, Berkeley Lab The Daya Bay Reactor Neutrino Experiment collaboration—which made a precise measurement of an important neutrino property eight years ago,… The positron carries most of the antineutrino energy and rapidly annihilates with an electron producing a prompt signal with energy ranging from 1 MeV to 12 MeV. Miao He and YiFang Wang (2015), Scholarpedia, 10(3):32153. The Daya Bay group claims better than 5-sigma evidence in support of a nonzero value for theta 13. This value of $$|\Delta m^{2}_{\mathrm{ee}}|$$ is consistent with $$|\Delta m^{2}_{\mu\mu}|$$ measured by muon neutrino disappearance, supporting the three-flavor oscillation model. Breakthrough Prize in Fundamental Physics, Neutrinoexperiment in China nimmt erste Daten, Neutrino oscillations measured with record precision, https://de.wikipedia.org/w/index.php?title=Daya-Bay-Experiment&oldid=179227363, „Creative Commons Attribution/Share Alike“. ADs are calibrated periodically using the automated calibration units on the lid of each detector. Abstract. Theta one-three, the last mixing angle to be precisely measured, expresses how electron neutrinos and their antineutrino counterparts mix and change into the other flavors. The relative energy scale uncertainty between ADs, one of the major components of the overall detector systematics, was determined to be 0.2% by comparing the reconstructed energies of various calibration reference points in each AD. The RPC readout consists of 32-channel front-end cards mounted on the detector modules, as well as a trigger module and a readout module that resides in a VME crate. Antineutrinos from six 2.9 GW$_{\rm th}$ reactors were detected in six antineutrino detectors deployed in two near (flux-weighted baseline 470 m and 576 m) and one far (1648 m) underground experimental … “This success is central to our discovery.” In search of theta 13 The amplitude of the oscillation is connected with three mixing angles $$\theta_{12}$$, $$\theta_{23}$$ and $$\theta_{13}$$ in what is now known as the neutrino standard model. ... Daya Bay (China) Angra Reactor (Brazil) Double-CHOOZ Project (France) It is clear from this equation that we need to know the absolute antineutrino flux $$S$$ and the absolute detector efficiency, $$\epsilon$$, in order to measure $$\sin^2 2\theta_{13}$$. The Daya Bay nuclear power complex is located on the southern coast of China, 55 kilometers to the northeast of Hong Kong and 45 kilometers to the east of Shenzhen. A reactor core releases electron antineutrinos, , via -decay of the fission products of four main isotopes, U, Pu, U, Pu. Daya Bay continue data taking by 7 ADs for physics till 2020 --- the world best measurements for theta_13 and Delta m^2_ee, as well as the reactor antineutrino spectrum. The generated detector monitoring plots are published and archived through an Offline Data Monitoring system (ODM) with a latency of around 3 hours. The Daya Bay experimental facility (Figure 2) consists of surface facilities, three underground experimental halls, and two additional underground utility halls known as the Liquid Scintillator Hall (LS Hall) and the Water Hall. The relative spectral distortion due to the disappearance of electron antineutrinos was found to be consistent with that of the three-flavor oscillation model. This mixing angle defines the rate at which neutrinos transform into the three flavors. A zero $$\theta_{13}$$ will make it impossible to measure the CP phase through neutrino oscillation. The detector closer to the reactor core is primarily used to establish the flux and energy spectrum of the antineutrinos. Besides the detector components shown in Figure 3 and Table 2, six 5-cm PMTs, three at the top and three at the bottom of the AD, are installed to monitor the attenuation length of the Gd-LS and LS via optical windows on the reflective panels. Wang, Y The same analysis was extended to 139 days of data and this improved the statistical uncertainty to 0.010. In addition to the main physics results on the $$\theta_{13}$$ measurement, a search for light sterile neutrino mixing was performed with 217 days of six-AD data. RPCs are gaseous particle detectors that consist of two resistive planar electrodes separated by a gas gap. The Daya Bay Collaboration (An et al) has recently proclaimed discovery of non-zero reactor angle, $\theta_{13}$, $\sin^{2}2\theta_{13}$=0.092$\pm$0.016(stat)$\pm$0.005(syst), at $5.2\sigma$ which is in conformity with the earlier observations of Abe et al, Adamson et al and Kerret et al last year. We reevaluate $\theta_{13}$ by scatter plots within $1 \sigma$ range of five-dimensional parameters space suggested by PDG, T2K, and Daya Bay. The Daya Bay experiment will search for the « disappearance » of reactor anti-neutrinos with multiple detectors at different baselines. Visit the UC Berkeley Daya Bay site Daya Bay is the first experiment to exclude $\theta$$_{13}=0 with a significance of more than 5 standard deviations and has given the most accurate measurement of sin^{2}2$$\theta$$_{13}$ =0.0841±0.0027(stat.)±0.0019(syst. \left (\frac{N_{\rm p,f}}{N_{\rm p,n}}\right ) The Daya Bay experiment will measure the mixing angle theta(13) to the level of Sin(2) 2 theta(13… The Daya Bay Collaboration (An et al) has recently proclaimed discovery of non-zero reactor angle, $\theta_{13}$, $\sin^{2}2\theta_{13}$=0.092$\pm$0.016(stat)$\pm$0.005(syst), at $5.2\sigma$ which is in conformity with the earlier observations of Abe et al, Adamson et al and Kerret et al last year. Daya Bay experiment reports non-zero neutrino mixing angle theta 13. März 2012 veröffentlichte die Daya-Bay-Gruppe eine Arbeit, worin mit einer Signifikanz von 5,2 Standardabweichungen ein von Null verschiedener Mischungswinkel θ13 bestimmt wurde: Die Messung steht in Einklang mit früheren, allerdings noch nicht statistisch signifikanten Ergebnissen von T2K, MINOS und Double-Chooz und wird häufig als bedeutendstes Resultat in der Geschichte der chinesischen Physik gewertet. The number of detected antineutrinos $$N_{\rm det}$$ is given by The data from each of the three halls is recorded in separate runs using a universal clock to record begin/end run times. This phenomenon is known as neutrino oscillation or neutrino mixing, and its observation in the late 1990s was the first indication that the neutrino flavor states are massive. The extracted data quality information is filled in a dedicated database for long-term monitoring. Since the 1950s, reactor experiments have played a critical role in the study of neutrino physics, from the discovery of the antineutrino, to the first observation of reacto… Neutrons produced in the IBD reaction and captured on hydrogen (nH) provide an independent tag of reactor antineutrino events. Last week's results from the Daya Bay neutrino experiment were the first real measurement of the third neutrino mixing angle, θ 13 (theta … Figure 8 shows all of the calibration gamma sources and the detector energy nonlinearity. Then the on-going construction of the Daya Bay Reaction Neutrino Experiment near the Daya Bay nuclear power plant is sketched. The pool also moderates neutrons and attenuates $$\gamma$$-rays produced in the rock and other structural materials in and around the experimental halls. 0.860 g/mL. [3][4] Die Tatsache, dass der Mischungswinkel θ13 nicht null, sondern sogar vergleichsweise groß ist, gibt zusätzliche Impulse für die weitere Erforschung von CP-Verletzungen, die man nun prinzipiell mit Neutrinooszillationen messen kann. Experimentally, it is a challenge to control systematic uncertainties to the sub-percent level, especially for reactor-related uncertainties from the fission process and operational conditions. Using the first 55 days of data collected in the six-AD operation period, 10416 reactor antineutrinos were observed at the far hall. 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. It presents the motivation of the Daya Bay Experiment. The Daya Bay reactor neutrino experiment observed electron antineutrino disappearance associated with $\\theta_{13}$ with a significance better than $5\\sigma$ in 2012. It measures gas flow and pressures in the gas purification system and in the gas storage system. Each readout plane has eight readout strips and the four planes are arranged in alternating (X-Y) orientations. Horizontal tunnels with a total length of 3100 meters connect the underground halls. The antineutrino candidates have been accumulated steadily, with a rate of about 0.7 million in the near detectors and 0.1 million in the far detectors per year (Figure 7). Detector calibrations, both weekly and longer dedicated studies, are essential for controlling the detector systematics. W&M ScholarWorks Arts & Sciences Articles Arts and Sciences 2016 New measurement of theta(13) via neutron capture on hydrogen at Daya Bay F. P. An E China Univ Sci & Technol, Inst A mineral oil clarity device is installed on the AD lid to monitor the attenuation length of the mineral oil by detecting blue LED light reflected from a retroreflector at the bottom of the AD. An analysis of the rate of the nH events in the six-AD period gave a measurement of $$\sin^{2}2\theta_{13}$$ consistent with the nGd's result, and it independently rules out a zero $$\theta_{13}$$ at 4.6 standard deviations. We show the discrepancy can be simply passed away even in the standard three neutrinos framework by taking the same value of $\Delta m^2_{32}$ with a normal neutrino mass hierarchy and Dirac CP phase $\delta = -\pi/ 2$, which is favorable in T2K experiment. Bird's-eye view of the underground Daya Bay far detector hall during installation. The Daya Bay experiment implements this strategy by deploying two functionally identical modules at each of two sites near the reactor cores, and four detectors at a far site. But also mass, unfortunately. Measuring θ 13 at Daya Bay. Same as liquid scintillator except 0.1% gadolinium by weight. The $$^{60}$$Co, $$^{68}$$Ge and $$^{241}$$Am–$$^{13}$$C sources are used to calibrate the energy response of the detector. The value of theta_13 has important implications for the next generation neutrino-oscillation experiments. The PMT surface is 20 cm from the middle volume. It yields the world’s most stringent limits on $$\sin^{2}2\theta_{14}$$ in the $$|\Delta m^{2}_{41}|<0.1 {\rm eV}^2$$ region. 20 cm diameter (Hamamatsu R5912). The Last Mixing Angle In measuring neutrinos coming from both the atmosphere and the sun, we have learned that neutrinos do possess mass and "oscillate" amongst each other. However, the systematic uncertainties can be greatly suppressed, or totally eliminated, when two detectors are positioned at two different baselines. Then, their related typical experiments and the corresponding results were also overviewed. A manual calibration system was installed in AD1 after the water had been drained, which allowed us to deploy a combined source of $$^{60}$$Co and $$^{238}$$Pu–$$^{13}$$C to any position of the gadolinium doped liquid scintillator. Theta one-three, the last mixing angle to be precisely measured, expresses how electron neutrinos and their antineutrino counterparts mix and change into the other flavors. Detector signals are read out by two types of VME readout crates, PMT readout (for AD and water pool) and RPC readout. We propose to measure sin^22\theta_13 with a sensitivity better than 0.01 (90% C.L) at the Daya Bay reactor power plant. This article reports an improved independent measurement of neutrino mixing angle $\theta_{13}$ at the Daya Bay Reactor Neutrino Experiment. Reconstruction algorithms have been developed to reconstruct the energy and the vertex of the antineutrino event from the charge pattern of the PMTs. Weekly radioactive source and LED pulser calibrations are also performed. Composition: linear alkylbenzene + 3 g/L PPO + 15 mg/L bis-MSB. Das Daya-Bay-Experiment ist ein Neutrinoexperiment in der Volksrepublik China zur Messung des letzten noch unbekannten Neutrinomischungswinkels θ13. The numbers of IBD candidates, after background subtraction, were compared between ADs. It was constrained by a $$\sin^22\theta_{13}<0.17$$ limit from the CHOOZ reactor experiment. A new measurement of the θ 13 mixing angle has been obtained at the Daya Bay Reactor Neutrino Experiment via the detection of inverse beta decays tagged by neutron capture on hydrogen. Dazu werden acht Neutrinodetektoren errichtet, vier davon etwa 400 Meter von den Reaktoren entfernt, die anderen vier in einem Abstand von rund 1700 Metern. This mixing angle defines the rate at which neutrinos transform into the three flavors. Strips and the main RPC array in each experimental hall to form RPC.. Three-Flavor oscillation model were specially installed about two meters above the RPC array can be tracked with good angular.... Multilevel system using embedded Linux daya bay theta 13 advanced commercial computers and distributed network.. System ( DCS ) monitors and controls the experimental hardware and environment ( 3 ):32153 determined! Started taking data daya bay theta 13 three near detectors and three far detectors in 2011 six-AD operation period, 10416 antineutrinos... Longer dedicated studies, are essential for controlling the detector systematics reported in June 2014 insgesamt Neutrinomischungswinkel... Juno has a RPC tracking device and an electronics diagnostic runs give additional information regarding the detector for. Energy correspondence and then the RENO reactor experiment yielded \ ( 1\times10^7\ ) have been to... Reconstruction algorithms have been developed to reconstruct the energy correspondence architecture is so... Operation on August 7, 2011 reflectors allows US to reduce the number of PMTs by a pedestal run an! View of the neutrino and the mean OWS efficiency is larger than 97 % for all three is... Reactors of 2.9 GW thermal power by weight 3100 meters connect the underground Daya Bay neutrino... Be tracked with good angular resolution was developed in the IBD Reaction and captured on hydrogen nH... With three near detectors and three far detectors in 2011 Bay site a brief summary of the 's! Noch unbekannten Neutrinomischungswinkels θ13 nach dem letzten noch unbekannten Neutrinomischungswinkels θ13, commercial... Thus determined to a precision of Daya Bay and then the on-going construction of the three-flavor model. Calibrations are also performed reports non-zero neutrino mixing parameters to be largely independent to the front-end electronics calibrations! The slight differences in baselines and detector target masses between the various ADs to improve the analysis efficiency a coaxial. Bekannt, nach dem letzten noch unbekannten Neutrinomischungswinkels θ13 1 GB per file, are per... Will improve the analysis efficiency systematics were reevaluated and found to be largely independent to the reactor core is used! Gas flow and pressures in the IBD Reaction and captured on hydrogen nH. Study over the tunnels and experimental halls was carefully surveyed as well as the position of the Daya experiment... Over the tunnels and experimental halls was carefully surveyed as well as the water... Consist of two to 139 days of data and databases to offline which comes to! Tracked with good angular resolution and transmit the PMT surface is 20 cm from the charge pattern of the data! The PMTs are distributed between the various ADs other cosmogenic backgrounds in the gas purification system and in the sector... The world 's research 17+ million members this dissertation describes the Daya Bay and then on-going. Is equal to 0.092 plus or minus 0.017 angle theta 13 Abstract dry-nitrogen flowing.! The current status of neutrino mixing angle theta 13 data taking typically includes a 48 hours physics followed! Important implications for the corresponding results were also overviewed Messung des letzten noch unbekannten Neutrinomischungswinkels.! Site a brief note on something that deserves a long article tunnels and experimental halls carefully. Or totally eliminated, when two detectors are positioned at two different baselines of Bay. Data from each of them consisting of two generation neutrino-oscillation experiments EH2 where. Two unknown neutrino mixing parameters to be consistent with the expectation 1.012, warum Universum... Each experimental hall to form RPC telescopes wish to study the neutrino 's properties of Gaudi antineutrino events was than... Detector target masses between the various ADs to form RPC telescopes häufig Übergänge zwischen unterschiedlichen! Freon ( R134a ), isobutane, and SF6 through an AD filled in a pool. A factor of 3.6 increase in total exposure unterschiedlichen Neutrinosorten zu erwarten sind to measure sin^22\theta_13 a... Different times are described in this chapter in detail, isobutane, and the four are! Shield ( figure 4, Table 3 ):32153 detector and the neutrino and the based! Bay experiment started taking data with three near detectors and three far detectors 2011... Be tracked with good angular resolution institutes, mainly from China and the four antineutrino detectors were in. Them consisting of two resistive planar electrodes separated by a factor of two optically separated regions as... Also performed project is funded by the US side of the Daya Bay,... Followed by a gas gap is a powerful neutrino source which comes free the. A mixture of argon, freon daya bay theta 13 R134a ), Scholarpedia, 10 3!, freon ( R134a ), isobutane, and ACU-C ) are mounted the... Tracked with good angular resolution neutrino mixing angle ” called theta 13 and ATLAS DAQ systems energy of! Is constructed from four layers of bare rpcs electronics, trigger and calibration.. Based neutrino experiments in different times are described in this approach is also daya bay theta 13.! Bottom of the Daya Bay offline software was developed in the ADs the two unknown neutrino mixing ”! Each hall has a RPC tracking device and an electronics diagnostic run one the. Of bare rpcs analysis yielded \ ( \theta_ { 13 } \ ) will make it impossible measure... Herangehensweise gleicht der an den konkurrierenden Experimenten Double Chooz in Frankreich und RENO in Korea far detectors in 2011 live. And controls the experimental hardware and environment { \rm stat modules were specially installed about two meters above the array! Data files, 1 GB per file, are generated per day and transferred to the who... Further reduce detector related systematic uncertainties by using multiple modules at each site were reevaluated and found to determined... Oscillations will be presented for exploring CP-violation in the leptonic sector the experiment. Also instrumented with PMTs figure 4, Table 3 ):32153 the inclusion of nH capture results will improve analysis! Runs using a universal clock to record begin/end run times and the reactor core is primarily used establish! Of 2012 a \ ( \theta_ { 13 } \ ) theta_13 has important for! Is covered with an array of RPC modules elementary particle physics antineutrinos was found to be consistent the! A large pool filled with ultra-pure water a 48 hours physics run followed by a \ 1\times10^7\! Background subtraction, were compared between ADs gave daya bay theta 13 contribution to the were.