First antineutrino energy spectrum from $^{235}$U fissions with the STEREO detector at ILL - Université Paris Cité Accéder directement au contenu
Article Dans Une Revue J.Phys.G Année : 2021

First antineutrino energy spectrum from $^{235}$U fissions with the STEREO detector at ILL

H. Almazán
  • Fonction : Auteur
C. Buck
  • Fonction : Auteur
M. Lindner
  • Fonction : Auteur
C. Roca
  • Fonction : Auteur
S. Schoppmann
  • Fonction : Auteur
A. Stutz
  • Fonction : Auteur
  • PersonId : 1274065
M. Vialat
  • Fonction : Auteur

Résumé

This article reports the measurement of the 235U-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 235U 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 ν ≃ 5.3 MeV. A Gaussian fit of this local excess leads to an amplitude of A = 12.1 ± 3.4% (3.5σ).

Dates et versions

hal-02973177 , version 1 (20-10-2020)

Identifiants

Citer

H. Almazán, L. Bernard, A. Blanchet, A. Bonhomme, C. Buck, et al.. First antineutrino energy spectrum from $^{235}$U fissions with the STEREO detector at ILL. J.Phys.G, 2021, 48 (7), pp.075107. ⟨10.1088/1361-6471/abd37a⟩. ⟨hal-02973177⟩
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