Abstract

Recently, new reactor antineutrino spectra have been provided for $^{235}\mathrm{U}$, $^{239}\mathrm{Pu}$, $^{241}\mathrm{Pu}$, and $^{238}\mathrm{U}$, 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 $<100\text{ }\text{ }\mathrm{m}$ leads to a ratio of observed event rate to predicted rate of $0.976\ifmmode\pm\else\textpm\fi{}0.024$. With our new flux evaluation, this ratio shifts to $0.943\ifmmode\pm\else\textpm\fi{}0.023$, 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…

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