Measuring cosmogenic 9Li background in a reactor neutrino experiment

Wen, L.; Cao, Junpeng; Luk, K. B.; Ma, Yuqian; Wang, Yifang; Yang, Changgen

doi:10.1016/j.nima.2006.04.047

Cited by 15 publications

(9 citation statements)

References 12 publications

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“…The rate of correlated background from the -n cascade of 9 Li- 8 He decays was evaluated from the distribution of the time since the last muon using the known decay times for these isotopes [11]. The 9 Li- 8 He background rate as a function of the muon energy deposited in the AD was estimated by preparing samples with and without detected neutrons 10 s to 200 s after the muon.…”

Section: Prl 108 171803 (2012) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

Observation of Electron-Antineutrino Disappearance at Daya Bay

An¹,

Bai²,

Balantekin³

et al. 2012

Phys. Rev. Lett.

1,975

1,645

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Section: Prl 108 171803 (2012) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

Observation of Electron-Antineutrino Disappearance at Daya Bay

An¹,

Bai²,

Balantekin³

et al. 2012

Phys. Rev. Lett.

1,975

1,645

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“…This association was complicated by the high muon rates in the detectors relative to the lifetime of these nuclides, rendering signal-by-signal discrimination impossible. Still, the distribution of times between eachν e candidate and the most recent AD muon signal could be used to estimate the β-n production rate [43], allowing statistical estimation of this background. The distribution of total correlated signal rate R total versus time since the most recent muon signal was expressed,…”

Section: (Iv)mentioning

confidence: 99%

Measurement of electron antineutrino oscillation based on 1230 days of operation of the Daya Bay experiment

An¹,

Balantekin²,

Band³

et al. 2017

Phys. Rev. D

223

359

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A measurement of electron antineutrino oscillation by the Daya Bay Reactor Neutrino Experiment is described in detail. Six 2.9-GWth nuclear power reactors of the Daya Bay and Ling Ao nuclear power facilities served as intense sources of ν e 's. Comparison of theν e rate and energy spectrum measured by antineutrino detectors far from the nuclear reactors (∼1500-1950 m) relative to detectors near the reactors (∼350-600 m) allowed a precise measurement ofν e disappearance. More than 2.5 millionν e inverse beta-decay interactions were observed, based on the combination of 217 days of operation of six antineutrino detectors (December, 2011-July, 2012) with a subsequent 1013 days using the complete configuration of eight detectors (October, 2012-July, 2015. Theν e rate observed at the far detectors relative to the near detectors showed a significant deficit, R ¼ 0.949 AE 0.002ðstatÞAE 0.002ðsystÞ. The energy dependence ofν e disappearance showed the distinct variation predicted by neutrino oscillation. Analysis using an approximation for the three-flavor oscillation probability yielded the flavor-mixing angle sin 2 2θ 13 ¼ 0.0841 AE 0.0027ðstatÞ AE 0.0019ðsystÞ and the effective neutrino mass-squared difference of jΔm 2 ee j ¼ ð2.50 AE 0.06ðstatÞ AE 0.06ðsystÞÞ × 10 −3 eV 2 . Analysis using the exact three-flavor probability found Δm

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“…The correlated β − n decays from cosmogenic 9 Li and 8 He can mimic IBD interactions. The rate of correlated background from this source is estimated by fitting the distribution of the time elapsed since the last muon with the known 9 Li and 8 He decay lifetimes [18]. The 20% systematic uncertainty takes into account the uncertainty in 9 Li and 8 He production by muons with energy below the showering muon threshold.…”

mentioning

confidence: 99%

Spectral Measurement of Electron Antineutrino Oscillation Amplitude and Frequency at Daya Bay

An¹,

Balantekin²,

Band³

et al. 2014

Phys. Rev. Lett.

258

215

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This Letter reports the first measurement of the oscillation amplitude and frequency of reactor antineutrinos at Daya Bay via neutron capture on hydrogen using 1958 days of data. With over 3.6 million signal candidates, an optimized candidate selection, improved treatment of backgrounds and efficiencies, refined energy calibration, and an energy response model for the capture-on-hydrogen sensitive region, the relative νe rates and energy spectra variation among the near and far detectors gives sin 2 2θ13 = 0.0759 +0.0050 −0.0049 and ∆m 2 32 = (2.72 +0.14 −0.15 )× 10 −3 eV 2 assuming the normal neutrino mass ordering, and ∆m 2 32 = (−2.83 +0.15 −0.14 )×10 −3 eV 2 for the inverted neutrino mass ordering. This estimate of sin 2 2θ13 is consistent with and essentially independent from the one obtained using the capture-on-gadolinium sample at Daya Bay. The combination of these two results yields sin 2 2θ13 = 0.0833 ± 0.0022, which represents an 8% relative improvement in precision regarding the Daya Bay full 3158-day capture-on-gadolinium result.

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Measuring cosmogenic 9Li background in a reactor neutrino experiment

Cited by 15 publications

References 12 publications

Observation of Electron-Antineutrino Disappearance at Daya Bay

Observation of Electron-Antineutrino Disappearance at Daya Bay

Measurement of electron antineutrino oscillation based on 1230 days of operation of the Daya Bay experiment

Spectral Measurement of Electron Antineutrino Oscillation Amplitude and Frequency at Daya Bay

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