Abstract
An independent measurement of neutrino oscillation angle θ13 using samples based on neutron captured on hydrogen (nH) was performed at the Daya Bay Reactor Neutrino Experiment. To deal with the challenges due to larger backgrounds, longer neutron capture time and lower detection efficiency, the nH analysis developed several data-driven techniques to precisely measure backgrounds and to control systematic uncertainties. This statistically independent and largely systematically uncorrelated independent analysis provides a firm confirmation of the nGd result and improves the overall uncertainty of sin2(2θ13). With 621 days of data and two newly installed antineutrino detectors, nH analysis yields sin2(2θ13) = 0.071 ± 0.011 in the three neutrino oscillation framework.
Highlights
It had been established that neutrino have non-zero mass and three flavors mix
Each detector has three nested cylindrical volumes, the innermost layer holds 20-ton gadolinium-doped liquid scintillator and is used to identify electron antineutrinos by inverse beta decay with neutron captured on gadolinium, the middle layer is filled with 22-ton liquid scintillator to detect γ’s that escape from the doped volume, this layer combined
We report the new results of neutron captured on hydrogen (nH) analysis with 621 days of data including 217-day data with six detectors
Summary
It had been established that neutrino have non-zero mass and three flavors mix. The neutrino oscillation indicates non-zero neutrino masses, which is a breakthrough of the Standard Model. The Daya Bay Reactor Neutrino Experiment measures θ13 through inverse beta decay (νe + p → e+ + n) (IBD) at ∼kilometer baseline. Each detector has three nested cylindrical volumes, the innermost layer holds 20-ton gadolinium-doped liquid scintillator and is used to identify electron antineutrinos by inverse beta decay with neutron captured on gadolinium (nGd), the middle layer is filled with 22-ton liquid scintillator to detect γ’s that escape from the doped volume, this layer combined 2. Data Analysis IBD candidates are selected with the following criteria.
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