Bulletin of the American Physical Society
APS April Meeting 2011
Volume 56, Number 4
Saturday–Tuesday, April 30–May 3 2011; Anaheim, California
Session J9: Reactor Neutrino Experiments |
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Sponsoring Units: DPF Chair: Zarko Pavlovic, Fermi National Accelerator Laboratory Room: Grand G |
Sunday, May 1, 2011 1:30PM - 1:42PM |
J9.00001: Daya Bay Reactor Neutrino Experiment Muon System Yue Meng, Debabrata Mohapatra The search for $\theta_{13}$, the last unknown mixing angle, is extremely important in understanding the lepton flavor mixing matrix, and the CP violation in the lepton sector. Reactor neutrino experiments can provide a clean laboratory for the $\theta_{13}$ measurement via electron antineutrino disappearance. The Daya Bay experiment proposes to measure $\sin^{2}2\theta_{13}$ with a sensitivity better than 0.01 (90\% C.L) in a three-year-run at the Daya Bay reactor power plant in China. To achieve this, the muon-induced backgrounds must be reduced to a low level. The Daya Bay muon system is a dual tagging system with multiple layers of resistive plate chambers (RPCs) above a water-pool (Cherenkov light detector). It detects cosmic ray muons and measures their time and positions relative to signal events with an overall combined efficiency of more than $99.5\%$. In this talk we are going to present details of the muon system along with the current status and estimates of expected background rates. [Preview Abstract] |
Sunday, May 1, 2011 1:42PM - 1:54PM |
J9.00002: Daya Bay Neutrino Experiment: Goal, Progress and Schedule Zhe Wang The discovery of neutrino oscillation, as a breakthrough in particle physics, prompted the Daya Bay Neutrino Experiment, which is designed to make a precise measurement of the last unknown neutrino mixing angle theta13, with a sensitivity of 0.01 for $\sin^2(2*\theta_{13}$), using reactor anti-neutrinos from the 17.4GW Daya Bay Nuclear Power Plant located in Shenzhen, China. This talk will introduce the goal of this experiment including an overall introduction of the selection of the site and baseline, the detector optimization, the current construction progress and the schedule for expected data taking. [Preview Abstract] |
Sunday, May 1, 2011 1:54PM - 2:06PM |
J9.00003: Double Chooz: Status of calibration program Igor Ostrovskiy Double Chooz is the first of the several new reactor anti- neutrino experiments to start data-taking. Once the detector is fully commissioned, the experiment is expected to surpass the limit on the neutrino mixing angle \(\theta_{13}\) established by its predecessor, the Chooz experiment. After summarizing the overall status of the experiment, we describe the calibration program planned for the first phase of the experiment, the motivation behind it, and the status of its implementation [Preview Abstract] |
Sunday, May 1, 2011 2:06PM - 2:18PM |
J9.00004: Prospects of Double Chooz Full Volume Calibration with optical finder: progress report Radovan Milincic Double Chooz has started data taking in December 2010. The detector commissioning is well underway. Double Chooz experiment will make a high sensitivity measurement and probe the small angle phase space for the angle $\theta_{13}$. In order to achieve this, systematic errors have to be at the level of 0.5\%. Important role in achieving the Double Chooz sensitivity goal is full volume calibration. Effectiveness of calibration depends on the positioning control of the instrument. Here we report on the progress of the development optical finder device that will be a part of the full volume calibration system for the Double Chooz and will provide independent check on the actual positioning of the full volume calibration system. [Preview Abstract] |
Sunday, May 1, 2011 2:18PM - 2:30PM |
J9.00005: The First Pair of Antineutrino Detectors for the Daya Bay Experiment Bryce Littlejohn The Daya Bay Reactor Neutrino Experiment is being built to precisely measure the value of $\theta_{13}$, the final mixing angle in the PMNS neutrino mixing matrix. The Daya Bay experiment is the most sensitive reactor $\theta_{13}$ experiment, measuring the parameter to a sensitivity of 0.01 for $sin^2(2\theta_{13})$ by comparing the relative flux of antineutrinos from the Daya Bay reactor cores with antineutrino detectors at near and far distances. In an effort to ensure detector systematics are well-understood to better than 0.38\%, the experiment's antineutrino detectors are constructed in pairs to be as identical as possible. This talk describes the design, fabrication, assembly, and characterization of the Daya Bay experiment's first two antineutrino detectors. [Preview Abstract] |
Sunday, May 1, 2011 2:30PM - 2:42PM |
J9.00006: The PMT system for the Daya Bay Reactor Neutrino Experiment Weili Zhong The goal of the Daya Bay Reactor Neutrino Experiment is to precisely measure $\sin^{2}(2\theta_{13})$ to a sensitivity of 0.01 by performing a relative measurement of electron antineutrino events with identical detectors at near and far sites. The antineutrino detectors will be placed in water pools and surrounded by at least 2.5m of water to suppress background. The water pools are also instrumented as Cherenkov detectors for tagging cosmic-ray muons that can generate background. Details of the photomultiplier tubes (PMTs) used in the antineutrino detectors and the water Cherenkov detectors are introduced. Testing results of the PMTs in the first pair antineutrino detectors and the first water pool are also presented. [Preview Abstract] |
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