New measurement of θ13 via neutron capture on hydrogen at Daya Bay
Abstract
This article reports an improved independent measurement of neutrino mixing angle θ13 at the Daya Bay Reactor Neutrino Experiment. Electron antineutrinos were identified by inverse β-decays with the emitted neutron captured by hydrogen, yielding a data-set with principally distinct uncertainties from that with neutrons captured by gadolinium. With the final two of eight antineutrino detectors installed, this study used 621 days of data including the previously reported 217-day data set with six detectors. The dominant statistical uncertainty was reduced by 49%. Intensive studies of the cosmogenic muon-induced 9Li and fast neutron backgrounds and the neutron-capture energy selection efficiency, resulted in a reduction of the systematic uncertainty by 26%. The deficit in the detected number of antineutrinos at the far detectors relative to the expected number based on the near detectors yielded sin22θ13=0.071±0.011 in the three-neutrino-oscillation framework. The combination of this result with the gadolinium-capture result is also reported.
- Authors:
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Org.:
- Daya Bay Collaboration
- OSTI Identifier:
- 1254123
- Alternate Identifier(s):
- OSTI ID: 1249657; OSTI ID: 1456938; OSTI ID: 1594392
- Report Number(s):
- BNL-112137-2016-JA
Journal ID: ISSN 2470-0010; PRVDAQ; R&D Project: PO-022; KA2201020
- Grant/Contract Number:
- SC0012704; AC02-05CH11231; SC0009973
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 93; Journal Issue: 7; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; neutrino oscillation; hydrogen neutron-capture; reactor antineutrinos; Daya Bay
Citation Formats
F. P. An. New measurement of θ13 via neutron capture on hydrogen at Daya Bay. United States: N. p., 2016.
Web. doi:10.1103/PhysRevD.93.072011.
F. P. An. New measurement of θ13 via neutron capture on hydrogen at Daya Bay. United States. https://doi.org/10.1103/PhysRevD.93.072011
F. P. An. 2016.
"New measurement of θ13 via neutron capture on hydrogen at Daya Bay". United States. https://doi.org/10.1103/PhysRevD.93.072011. https://www.osti.gov/servlets/purl/1254123.
@article{osti_1254123,
title = {New measurement of θ13 via neutron capture on hydrogen at Daya Bay},
author = {F. P. An},
abstractNote = {This article reports an improved independent measurement of neutrino mixing angle θ13 at the Daya Bay Reactor Neutrino Experiment. Electron antineutrinos were identified by inverse β-decays with the emitted neutron captured by hydrogen, yielding a data-set with principally distinct uncertainties from that with neutrons captured by gadolinium. With the final two of eight antineutrino detectors installed, this study used 621 days of data including the previously reported 217-day data set with six detectors. The dominant statistical uncertainty was reduced by 49%. Intensive studies of the cosmogenic muon-induced 9Li and fast neutron backgrounds and the neutron-capture energy selection efficiency, resulted in a reduction of the systematic uncertainty by 26%. The deficit in the detected number of antineutrinos at the far detectors relative to the expected number based on the near detectors yielded sin22θ13=0.071±0.011 in the three-neutrino-oscillation framework. The combination of this result with the gadolinium-capture result is also reported.},
doi = {10.1103/PhysRevD.93.072011},
url = {https://www.osti.gov/biblio/1254123},
journal = {Physical Review D},
issn = {2470-0010},
number = 7,
volume = 93,
place = {United States},
year = {Thu Apr 21 00:00:00 EDT 2016},
month = {Thu Apr 21 00:00:00 EDT 2016}
}
Web of Science
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