Improved measurement of the reactor antineutrino flux and spectrum at Daya Bay
Abstract
A new measurement of the reactor antineutrino flux and energy spectrum by the Daya Bay reactor neutrino experiment is reported. The antineutrinos were generated by six 2.9 GWth nuclear reactors and detected by eight antineutrino detectors deployed in two near (560 m and 600 m flux-weighted baselines) and one far (1640 m flux-weighted baseline) underground experimental halls. With 621 days of data, more than 1.2 million inverse beta decay (IBD) candidates were detected. The IBD yield in the eight detectors was measured, and the ratio of measured to predicted flux was found to be 0.946±0.020 (0.992±0.021) for the Huber+Mueller (ILL+Vogel) model. A 2.9σ deviation was found in the measured IBD positron energy spectrum compared to the predictions. In particular, an excess of events in the region of 4–6 MeV was found in the measured spectrum, with a local significance of 4.4σ. A reactor antineutrino spectrum weighted by the IBD cross section is extracted for model-independent predictions.
Additional Information
© 2017 IOP Publishing. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd. Received 19 July 2016, Revised 29 September 2016. Supported in part by the Ministry of Science and Technology of China, the United States 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, the Research Grants Council of the Hong Kong Special Administrative Region of China, the MOST and MOE in Taiwan, the U.S. National Science 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 for Scientific and Technological Research of Chile.Attached Files
Published - An_2017_Chinese_Phys._C_41_013002.pdf
Submitted - 1607.05378.pdf
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Additional details
- Eprint ID
- 75036
- Resolver ID
- CaltechAUTHORS:20170310-152007342
- Ministry of Science and Technology (Taipei)
- Department of Energy (DOE)
- Chinese Academy of Sciences
- National Natural Science Foundation of China
- Guangdong Provincial Government
- Shenzhen Municipal Government
- China General Nuclear Power Group
- Research Grants Council of Hong Kong
- Ministry of Education (Taipei)
- NSF
- Ministry of Education, Youth and Sports of the Czech Republic
- JINR
- Russian Foundation for Basic Research
- Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)
- Created
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2017-03-11Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field