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Reactor rate modulation oscillation analysis with two detectors in Double Chooz
Journal article   Open access   Peer reviewed

Reactor rate modulation oscillation analysis with two detectors in Double Chooz

T. Abrahao, H. Almazan, J. C. dos Anjos, S. Appel, J. C. Barriere, Bekman, T. J. C. Bezerra, L. Bezrukov, E. Blucher, T. Brugiere, …
The journal of high energy physics, v 2021(1)
28 Jan 2021
DOI: https://doi.org/10.1007/JHEP01(2021)190
url
https://doi.org/10.1007/jhep01(2021)190View
Published, Version of Record (VoR)CC BY V4.0,  Open
url
https://doi.org/10.1007/JHEP01(2021)190View
Published, Version of Record (VoR) Open

Abstract

Physical Sciences Physics Physics, Particles & Fields Science & Technology
A theta(13) oscillation analysis based on the observed antineutrino rates at the Double Chooz far and near detectors for different reactor power conditions is presented. This approach provides a so far unique simultaneous determination of theta(13) and the total background rates without relying on any assumptions on the specific background contributions. The analysis comprises 865 days of data collected in both detectors with at least one reactor in operation. The oscillation results are enhanced by the use of 24.06 days (12.74 days) of reactor-off data in the far (near) detector. The analysis considers the (v) over bar (e) interactions up to a visible energy of 8.5MeV, using the events at higher energies to build a cosmogenic background model considering fast-neutrons interactions and Li-9 decays. The backgroundmodel-independent determination of the mixing angle yields sin(2)(2 theta(13)) = 0.094 +/- 0.017, being the best-fit total background rates fully consistent with the cosmogenic background model. A second oscillation analysis is also performed constraining the total background rates to the cosmogenic background estimates. While the central value is not significantly modified due to the consistency between the reactor-off data and the background estimates, the addition of the background model reduces the uncertainty on theta(13) to 0.015. Along with the oscillation results, the normalization of the anti-neutrino rate is measured with a precision of 0.86%, reducing the 1.43% uncertainty associated to the expectation.

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Physics, Particles & Fields
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