An et al. Reply:

Abstract

FIG. 1. An x-ray EDXS spectrum obtained at 300 kV from individual τ − B particles. Peaks are observed for B Kα (180 eV) and Cu peaks (Cu Lα ∼ 950 eV Cu Kα∼8.0 keV, and K β ∼ 8.7 keV) from the TEM grid are visible, but peaks for the proposed impurity elements are not.

Analysis of the Daya Bay Reactor Antineutrino Flux Changes with Fuel Burnup

“…The current fit to ILL leads to a change in the IBD spectrum that is very similar to the Huber model, while the summation predictions are closer to experiment. The Daya Bay collaboration concluded that the expected Huber model 235 U spectrum is too high in magnitude, while that for 239 Pu is consistent with the DB [1], the solid line is the prediction of the summation method, while the dashed line is obtained from converting the ILL data to antineutrino spectra and using the database for 238 U.…”

“…Recent results from the Daya Bay (DB) reactor neutrino experiment [1] show significant change in the emitted antineutrino flux with the evolution of the reactor fuel. Over the course of 1230 days, the fuel evolved such that the fraction of fissions from 239 Pu increased from 25% to 35%, while those from 235 U decreased from 63% to 51%.…”

“…Over the same period, the fraction from 238 U remained approximately constant at 7.6%, while the 241 Pu fraction increased from 4% to 8%. The dependence of antineutrino flux on the fuel evolution was measured [1] by the change in the yield from the inverse beta decay (IBD) reaction ν + p → e + + n with the variation in the 239 Pu fission fraction, F 239 . The IBD yield, which is an integral over energy of the product of the IBD cross section and the antineutrino flux per fission, was fitted with a linear dependence on F 239 as [1],…”

Dissecting Reactor Antineutrino Flux Calculations

“…By jointly analyzing the NEOS and Daya Bay spectra, Huber [20] concluded that 239,241 Pu are unlikely sources of the 'bump'. Very recently, by studying the dependence of the IBD antineutrino yield as function of the Pu amount in the reactors, the Daya Bay collaboration announced that 235 U may be the primary contributor to the reactor antineutrino anomaly [21].…”

Measurement of fission yields and isomeric yield ratios at IGISOL

“…It has also been pointed out that the differences between calculated and measured antineutrino production at Daya Bay may be due to a lack of knowledge on IYR [7,8].…”