Spectral Measurement of Electron Antineutrino Oscillation Amplitude and Frequency at Daya Bay
Abstract
A measurement of the energy dependence of antineutrino disappearance at the Daya Bay reactor neutrino experiment is reported. Electron antineutrinos (ν¯_e) from six 2.9 GW_(th) reactors were detected with six detectors deployed in two near (effective baselines 512 and 561 m) and one far (1579 m) underground experimental halls. Using 217 days of data, 41 589 (203 809 and 92 912) antineutrino candidates were detected in the far hall (near halls). An improved measurement of the oscillation amplitude sin^2 2θ_(13) = 0.090^(+0.008)_(−0.009) and the first direct measurement of the ν¯e mass-squared difference |Δm2ee|=(2.59^(+0.19)_(−0.20))×10^−3 eV^2 is obtained using the observed ν¯_e rates and energy spectra in a three-neutrino framework. This value of |Δm^(2)_(ee)| is consistent with |Δm^(2)_(μμ)| measured by muon neutrino disappearance, supporting the three-flavor oscillation model.
Additional Information
© 2014 American Physical Society. Received 24 October 2013; published 10 February 2014. The Daya Bay Experiment is supported in part by the Ministry of Science and Technology of China, the United States Department of Energy, the Chinese Academy of Sciences, the National Natural Science Foundation of China, the Guangdong provincial government, the Shenzhen municipal government, the China Guangdong Nuclear Power Group, Shanghai Laboratory for Particle Physics and Cosmology, the Research Grants Council of the Hong Kong Special Administrative Region of China, 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, Charles University in Prague, Yale University, the Joint Institute of Nuclear Research in Dubna, Russia, and the NSFC-RFBR joint 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 Guangdong Nuclear Power Group and China Light & Power Company.Attached Files
Published - PhysRevLett.112.061801.pdf
Submitted - 1310.6732v2.pdf
Files
| Name | Size | Download all |
|---|---|---|
|
md5:9ecfea5cb8b07d4a712c95df817edd57
|
494.7 kB | Preview Download |
|
md5:bf56e1edfa16a4c53ae25e53c3d83d18
|
674.5 kB | Preview Download |
Additional details
- Eprint ID
- 44542
- Resolver ID
- CaltechAUTHORS:20140327-145449958
- Ministry of Science and Technology of China
- Department of Energy (DOE)
- Chinese Academy of Sciences
- National Natural Science Foundation of China
- Guangdong provincial government
- Shenzhen municipal government
- China Guangdong Nuclear Power Group
- Shanghai Laboratory for Particle Physics and Cosmology
- Research Grants Council of the Hong Kong Special Administrative Region of China
- University Development Fund of The University of Hong Kong
- MOE program for Research of Excellence at National Taiwan University
- National Chiao-Tung University
- NSC fund support from Taiwan
- NSF
- Ministry of Education, Youth and Sports of the Czech Republic
- Charles University in Prague
- Yale University
- Joint Institute of Nuclear Research in Dubna, Russia
- NSFC-RFBR joint research program
- Created
-
2014-03-28Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field