First antineutrino energy spectrum from 235U fissions with the STEREO detector 
at ILL

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

doi:10.1088/1361-6471/abd37a

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First antineutrino energy spectrum from ²³⁵U fissions with the STEREO detector at ILL

MPS-Authors

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

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

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Citation

STEREO collaboration, Almazan, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., et al. (2021). First antineutrino energy spectrum from ²³⁵U fissions with the STEREO detector at ILL. Journal of Physics G: Nuclear and Particle Physics, 48(7): 075107. doi:10.1088/1361-6471/abd37a.

Cite as: https://hdl.handle.net/21.11116/0000-0009-0223-D

Abstract

This article reports the measurement of the $^{235}$U-induced antineutrino
spectrum shape by the STEREO experiment. 43'000 antineutrinos have been
detected at about 10 m from the highly enriched core of the ILL reactor during
118 full days equivalent at nominal power. The measured inverse beta decay
spectrum is unfolded to provide a pure $^{235}$U spectrum in antineutrino
energy. A careful study of the unfolding procedure, including a
cross-validation by an independent framework, has shown that no major biases
are introduced by the method. A significant local distortion is found with
respect to predictions around $E_\nu \simeq 5.3$ MeV. A gaussian fit of this
local excess leads to an amplitude of $A = 12.1 \pm 3.4\%$ (3.5$\sigma$).