Accurate Measurement of the Electron Antineutrino Yield of 235U Fissions from 
the STEREO Experiment with 119 Days of Reactor-On Data

Almazan, H.; Bernard, L.; Blanchet, A.; Bonhomme, A.; Buck, C.; del Amo Sanchez, P.; El Atmani, I; Haser, Julia; Labit, L.; Lamblin, J.; Letourneau, A.; Lhuillier, D.; Licciardi, M.; Lindner, M.; Materna, T.; Minotti, A.; Onillon, A.; Pessard, H.; Real, J-S; Roca, C.; Rogly, R.; Salagnac, T.; Savu, V; Schoppmann, S.; Sergeyeva, V; Soldner, T.; Stutz, A.; Vialat, M.

doi:10.1103/PhysRevLett.125.201801

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Accurate Measurement of the Electron Antineutrino Yield of ²³⁵U Fissions from the STEREO Experiment with 119 Days of Reactor-On Data

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Buck, C.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Haser, Julia
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Lindner, M.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Citation

Almazan, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., del Amo Sanchez, P., et al. (2020). Accurate Measurement of the Electron Antineutrino Yield of ²³⁵U Fissions from the STEREO Experiment with 119 Days of Reactor-On Data. Physical Review Letters, 125(20): 201801. doi:10.1103/PhysRevLett.125.201801.

Cite as: https://hdl.handle.net/21.11116/0000-0008-2811-8

Abstract

We report a measurement of the antineutrino rate from the fission of U-235 with the STEREO detector using 119 days of reactor turned on. In our analysis, we perform several detailed corrections and achieve the most precise single measurement at reactors with highly enriched U-235 fuel. We measure an IBD cross section per fission of sigma(f) = (6.34 +/- 0.06[stat] +/- 0.15[sys] +/- 0.15[model]) x 10(-43) cm(2)/fission and observe a rate deficit of (5.2 +/- 0.8[stat] +/- 2.3[sys] +/- 2.3[model])% compared to the model, consistent with the deficit of the world average. Testing U-235 as the sole source of the deficit, we find a tension between the results of lowly and highly enriched U-235 fuel of 2.1 standard deviations.