Independent Measurement of Theta13 via Neutron Capture on Hydrogen at Daya Bay

Abstract

A new measurement of the ${\theta }_{13}$ mixing angle has been obtained at the Daya Bay Reactor Neutrino Experiment via the detection of inverse beta decays tagged by neutron capture on hydrogen. The antineutrino events for hydrogen capture are distinct from those for gadolinium capture with largely different systematic uncertainties, allowing a determination independent of the gadolinium-capture result and an improvement on the precision of ${\theta }_{13}$ measurement. With a 217-day antineutrino data set obtained with six antineutrino detectors and from six 2.9 GW${}_{th}$ reactors, the rate deficit observed at the far hall is interpreted as ${\sin }^{2}2{\theta }_{13}=0.083\pm 0.018$ in the three-flavor oscillation model. When combined with the gadolinium-capture result from Daya Bay, we obtain ${\sin }^{2}2{\theta }_{13}=0.089\pm 0.008$ as the final result for the six-antineutrino-detector configuration of the Daya Bay experiment.

References in corpus (6)

• Observation of electron-antineutrino disappearance at Daya Bay
• Indication of Electron Neutrino Appearance from an Accelerator-produced Off-axis Muon Neutrino Beam
• Improved Measurement of Electron Antineutrino Disappearance at Daya Bay
• Measurement of the neutrino mass splitting and flavor mixing by MINOS
• A side-by-side comparison of Daya Bay antineutrino detectors
• Determination of Neutrino Mass Hierarchy and Theta_13 with a Remote Detector of Reactor Antineutrinos

Cited by in corpus (9)

• Neutrino Mass Hierarchy
• Nonzero ${\theta }_{13}$ and Leptogenesis in a Type-I See-saw Model with $A_4$ Symmetry
• Constraints on Large Extra Dimensions from the MINOS Experiment
• Measurement of Electron Antineutrino Oscillation Amplitude and Frequency via Neutron Capture on Hydrogen at Daya Bay
• Performance of the 1-ton Prototype Neutrino Detector at CJPL-I
• Trimaximal Mixing and Extended Magic Symmetry in a Model of Neutrino Mass Matrix
• Observation of Reactor Antineutrino Disappearance Using Delayed Neutron Capture on Hydrogen at RENO
• A Decade of Discoveries by the Daya Bay Reactor Neutrino Experiment
• Search For Electron-Antineutrinos Associated With Gravitational-Wave Events GW150914, GW151012, GW151226, GW170104, GW170608, GW170814, and GW170817 at Daya Bay