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New Measurement of Antineutrino Oscillation with the Full Detector Configuration at Daya Bay

An, F. P. and McKeown, R. D. (2015) New Measurement of Antineutrino Oscillation with the Full Detector Configuration at Daya Bay. Physical Review Letters, 115 (11). Art. No. 111802. ISSN 0031-9007. https://resolver.caltech.edu/CaltechAUTHORS:20151005-155215011

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Abstract

We report a new measurement of electron antineutrino disappearance using the fully constructed Daya Bay Reactor Neutrino Experiment. The final two of eight antineutrino detectors were installed in the summer of 2012. Including the 404 days of data collected from October 2012 to November 2013 resulted in a total exposure of 6.9×10^5 GW_(th) ton  days, a 3.6 times increase over our previous results. Improvements in energy calibration limited variations between detectors to 0.2%. Removal of six ^(241)Am−^(13)C radioactive calibration sources reduced the background by a factor of 2 for the detectors in the experimental hall furthest from the reactors. Direct prediction of the antineutrino signal in the far detectors based on the measurements in the near detectors explicitly minimized the dependence of the measurement on models of reactor antineutrino emission. The uncertainties in our estimates of sin 2^2θ_(13) and |Δm^2_(ee)| were halved as a result of these improvements. An analysis of the relative antineutrino rates and energy spectra between detectors gave sin^2 2θ_(13)=0.084±0.005 and |Δm^2_(ee)|=(2.42±0.11)×10^(−3) eV^2 in the three-neutrino framework.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevLett.115.111802 DOIArticle
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.115.111802PublisherArticle
http://journals.aps.org/prl/supplemental/10.1103/PhysRevLett.115.111802PublisherSupplemental Material
Additional Information:© 2015 American Physical Society. Received 13 May 2015; published 11 September 2015. Daya Bay is supported in part by the Ministry of Science and Technology of China, the U.S. Department of Energy, the Chinese Academy of Sciences, the CAS Center for Excellence in Particle Physics, the National Natural Science Foundation of China, the Guangdong provincial government, the Shenzhen municipal government, the China General Nuclear Power Group, Key Laboratory of Particle and Radiation Imaging (Tsinghua University), the Ministry of Education, Key Laboratory of Particle Physics and Particle Irradiation (Shandong University), the Ministry of Education, Shanghai Laboratory for Particle Physics and Cosmology, the Research Grants Council of the Hong Kong Special Administrative Region of China, the University Development Fund of The University of Hong Kong, the MOE program for Research of Excellence at National Taiwan University, National Chiao-Tung University, and NSC fund support from Taiwan, the U.S. National Science Foundation, the Alfred P. Sloan Foundation, the Ministry of Education, Youth, and Sports of the Czech Republic, the Joint Institute of Nuclear Research in Dubna, Russia, the NSFC-RFBR joint research program, the National Commission of Scientific and Technological Research of Chile, and the Tsinghua University Initiative Scientific Research Program. We acknowledge Yellow River Engineering Consulting Co., Ltd., and China Railway 15th Bureau Group Co., Ltd., for building the underground laboratory. We are grateful for the ongoing cooperation from the China General Nuclear Power Group and China Light and Power Company.
Funders:
Funding AgencyGrant Number
Ministry of Science and Technology (China)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Chinese Academy of SciencesUNSPECIFIED
CAS Center for Excellence in Particle PhysicsUNSPECIFIED
National Natural Science Foundation of ChinaUNSPECIFIED
Guangdong Provincial GovernmentUNSPECIFIED
Shenzhen Municipal GovernmentUNSPECIFIED
China General Nuclear Power GroupUNSPECIFIED
Tsinghua UniversityUNSPECIFIED
Shandong UniversityUNSPECIFIED
Shanghai Laboratory for Particle Physics and CosmologyUNSPECIFIED
Research Grants Council (RGC) of Hong KongUNSPECIFIED
University of Hong KongUNSPECIFIED
National Taiwan UniversityUNSPECIFIED
National Chiao-Tung UniversityUNSPECIFIED
National Science Council (Taipei)UNSPECIFIED
NSFUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Ministry of Education, Youth, and Sports (MEYS) of Czech RepublicUNSPECIFIED
Joint Institute of Nuclear Research (Dubna)UNSPECIFIED
NSFC-RFBR joint research programUNSPECIFIED
National Commission of Scientific and Technological Research (Chile)UNSPECIFIED
Tsinghua University Initiative Scientific Research ProgramUNSPECIFIED
Issue or Number:11
Classification Code:PACS numbers: 14.60.Pq, 13.15.+g, 28.50.Hw, 29.40.Mc
Record Number:CaltechAUTHORS:20151005-155215011
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20151005-155215011
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60785
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:05 Oct 2015 23:13
Last Modified:03 Oct 2019 09:00

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