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Reactor Antineutrino Anomaly

Abstract : Recently new reactor antineutrino spectra have been provided for 235U, 239Pu, 241Pu and 238U, increasing the mean flux by about 3 percent. To good approximation, this reevaluation applies to all reactor neutrino experiments. The synthesis of published experiments at reactor-detector distances <100 m leads to a ratio of observed event rate to predicted rate of 0.979(0.029). With our new flux evaluation, this ratio shifts to 0.937(0.027), leading to a deviation from unity at 98.4% C.L. which we call the reactor antineutrino anomaly. The compatibility of our results with the existence of a fourth non-standard neutrino state driving neutrino oscillations at short distances is discussed. The combined analysis of reactor data, gallium solar neutrino calibration experiments, and MiniBooNE-neutrino data disfavors the no-oscillation hypothesis at 99.93% C.L. The oscillation parameters are such that |Delta m_{new}^2|>1.5 eV^2 (99%) and sin^2(2\theta_{new})=0.17(0.1) (95%). Constraints on the theta13 neutrino mixing angle are revised.
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Contributor : Michel Cribier <>
Submitted on : Monday, January 17, 2011 - 10:31:38 AM
Last modification on : Monday, November 23, 2020 - 2:32:03 PM

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G. Mention, M. Fechner, T. Lasserre, Th. A. Mueller, D. Lhuillier, et al.. Reactor Antineutrino Anomaly. Physical Review D, American Physical Society, 2011, 83, pp.073006. ⟨10.1103/PhysRevD.83.073006⟩. ⟨in2p3-00556522⟩



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