Reactor antineutrino shoulder explained by energy scale nonlinearities?

Abstract : The Daya Bay, Double Chooz and RENO experiments recently observed a significant distortion in their detected reactor antineutrino spectra, being at odds with the current predictions. Although such a result suggests to revisit the current reactor antineutrino spectra modeling, an alternative scenario, which could potentially explain this anomaly, is explored in this letter. Using an appropriate statistical method, a study of the Daya Bay experiment energy scale is performed. While still being in agreement with the γ calibration data and B12 measured spectrum, it is shown that a O(1%) deviation of the energy scale reproduces the distortion observed in the Daya Bay spectrum, remaining within the quoted calibration uncertainties. Potential origins of such a deviation, which challenge the energy calibration of these detectors, are finally discussed.
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Soumis le : jeudi 23 novembre 2017 - 10:32:21
Dernière modification le : mercredi 20 mars 2019 - 07:27:48

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G. Mention, M. Vivier, J. Gaffiot, T. Lasserre, A. Letourneau, et al.. Reactor antineutrino shoulder explained by energy scale nonlinearities?. Phys.Lett.B, 2017, 773, pp.307-312. 〈10.1016/j.physletb.2017.08.035〉. 〈hal-01645678〉



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