Abstract
Recently, new reactor antineutrino spectra have been provided for , , , and , increasing the mean flux by about 3%. To a good approximation, this reevaluation applies to all reactor neutrino experiments. The synthesis of published experiments at reactor-detector distances leads to a ratio of observed event rate to predicted rate of . With our new flux evaluation, this ratio shifts to , leading to a deviation from unity at 98.6% C.L. which we call the reactor antineutrino anomaly. The compatibility of our results with the existence of a fourth nonstandard neutrino state driving neutrino oscillations at short distances is discussed. The combined analysis of reactor data, gallium solar neutrino calibration experiments, and MiniBooNE- data disfavors the no-oscillation hypothesis at 99.8% C.L. The oscillation parameters are such that (95%) and (95%). Constraints on the neutrino mixing angle are revised.
9 More- Received 14 January 2011
DOI:https://doi.org/10.1103/PhysRevD.83.073006
© 2011 American Physical Society