JHEP01(2021)190.pdf (487.45 kB)
Reactor rate modulation oscillation analysis with two detectors in Double Chooz
journal contribution
posted on 2023-06-10, 01:44 authored by T Abrahão, H Almazan, J C dos Anjos, S Appel, J C Barriere, I Bekman, Thiago Sogo BezerraThiago Sogo Bezerra, L Bezrukov, E Blucher, T Brugière, C Buck, J Busenitz, A Cabrera, M Cerrada, E Chauveau, The Double Chooz collaboration, othersA ?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 ?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 ?¯ e interactions up to a visible energy of 8.5 MeV, using the events at higher energies to build a cosmogenic background model considering fast-neutrons interactions and 9Li decays. The background-model-independent determination of the mixing angle yields sin2(2?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 ?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. [Figure not available: see fulltext.]
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- Published
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Journal
Journal of High Energy PhysicsISSN
1029-8479Publisher
SpringerExternal DOI
Volume
2021Page range
1-15Article number
a190Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2021-11-15First Open Access (FOA) Date
2021-11-15First Compliant Deposit (FCD) Date
2021-11-15Usage metrics
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