Accurate Measurement of the Electron Antineutrino Yield of ^{235}U Fissions from the STEREO Experiment with 119 Days of Reactor-On Data.
作者信息
Almazán H, Bernard L, Blanchet A, Bonhomme A, Buck C, Sanchez P Del Amo, Atmani I El, Haser J, Labit L, Lamblin J, Letourneau A, Lhuillier D, Licciardi M, Lindner M, Materna T, Minotti A, Onillon A, Pessard H, Réal J-S, Roca C, Rogly R, Salagnac T, Savu V, Schoppmann S, Sergeyeva V, Soldner T, Stutz A, Vialat M
机构信息
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
Université Grenoble Alpes, CNRS, Grenoble INP, LPSC-IN2P3, 38000 Grenoble, France.
出版信息
Phys Rev Lett. 2020 Nov 13;125(20):201801. doi: 10.1103/PhysRevLett.125.201801.
We report a measurement of the antineutrino rate from the fission of ^{235}U 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 ^{235}U fuel. We measure an IBD cross section per fission of σ_{f}=(6.34±0.06[stat]±0.15[sys]±0.15[model])×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 ^{235}U as the sole source of the deficit, we find a tension between the results of lowly and highly enriched ^{235}U fuel of 2.1 standard deviations.
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