New measurement of θ13 via neutron capture on hydrogen at Daya Bay

NCUIR > Research Center > Center for High Energy and High Field Physics (CHiP) > journal & Dissertation > Item 987654321/105070

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/105070

Title:	New measurement of θ13 via neutron capture on hydrogen at Daya Bay
Authors:	彭仁傑;Brookhaven National Laboratory (BNL), Upton, NY (United States)
Contributors:	高能與強場物理研究中心
Keywords:	Daya Bay;hydrogen neutron-capture;neutrino oscillation;reactor antineutrinos
Date:	2016-04-21
Issue Date:	2026-04-23 12:06:02 (UTC+8)
Publisher:	American Physical Society;United States: American Physical Society (APS)
Abstract:	摘要： 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. As a result, the combination of this result with the gadolinium-capture result is also reported. 出版者： United States: American Physical Society (APS) 出版日期： 2016-04-21 出處： Physical review. D, 2016-04, Vol.93 (7) 識別號： ISSN: 2470-0010 識別號： DOI: 10.1103/PhysRevD.93.072011
Appears in Collections:	[Center for High Energy and High Field Physics (CHiP)] journal & Dissertation

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