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Title: Improved Measurement of the Reactor Antineutrino Flux at Daya Bay

Abstract

This work reports a precise measurement of the reactor antineutrino flux using 2.2 million inverse beta decay (IBD) events collected with the Daya Bay near detectors in 1230 days. The dominant uncertainty on the neutron detection efficiency is reduced by 56% with respect to the previous measurement through a comprehensive neutron calibration and detailed data and simulation analysis. The new average IBD yield is determined to be (5.91±0.09) ×10−43 cm2/fission with total uncertainty improved by 29%. The corresponding mean fission fractions from the four main fission isotopes 235U, 238U, 239Pu, and 241Pu are 0.564, 0.076, 0.304, and 0.056, respectively. The ratio of measured to predicted antineutrino yield is found to be 0.952±0.014±0.023 (1.001±0.015±0.027) for the Huber-Mueller (ILL-Vogel) model, where the first and second uncertainty are experimental and theoretical model uncertainty, respectively. This measurement confirms the discrepancy between the world average of reactor antineutrino flux and the Huber-Mueller model.

Authors:
;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1560776
Alternate Identifier(s):
OSTI ID: 1566861
Report Number(s):
BNL-212107-2019-JAAM
Journal ID: ISSN 2470--0010
Grant/Contract Number:  
SC0012704
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 100; Journal Issue: 5; Journal ID: ISSN 2470--0010
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Adey, D, and Jaffe, David E. Improved Measurement of the Reactor Antineutrino Flux at Daya Bay. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.100.052004.
Adey, D, & Jaffe, David E. Improved Measurement of the Reactor Antineutrino Flux at Daya Bay. United States. doi:10.1103/PhysRevD.100.052004.
Adey, D, and Jaffe, David E. Thu . "Improved Measurement of the Reactor Antineutrino Flux at Daya Bay". United States. doi:10.1103/PhysRevD.100.052004.
@article{osti_1560776,
title = {Improved Measurement of the Reactor Antineutrino Flux at Daya Bay},
author = {Adey, D and Jaffe, David E.},
abstractNote = {This work reports a precise measurement of the reactor antineutrino flux using 2.2 million inverse beta decay (IBD) events collected with the Daya Bay near detectors in 1230 days. The dominant uncertainty on the neutron detection efficiency is reduced by 56% with respect to the previous measurement through a comprehensive neutron calibration and detailed data and simulation analysis. The new average IBD yield is determined to be (5.91±0.09) ×10−43 cm2/fission with total uncertainty improved by 29%. The corresponding mean fission fractions from the four main fission isotopes 235U, 238U, 239Pu, and 241Pu are 0.564, 0.076, 0.304, and 0.056, respectively. The ratio of measured to predicted antineutrino yield is found to be 0.952±0.014±0.023 (1.001±0.015±0.027) for the Huber-Mueller (ILL-Vogel) model, where the first and second uncertainty are experimental and theoretical model uncertainty, respectively. This measurement confirms the discrepancy between the world average of reactor antineutrino flux and the Huber-Mueller model.},
doi = {10.1103/PhysRevD.100.052004},
journal = {Physical Review D},
number = 5,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.100.052004

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