Speaker
Description
This talk will present a reactor flux and spectrum measurement with the Daya Bay full data set, 34% increase in statistics compared to the previous results. Using detector data spanning effective $\mathrm{^{239}Pu}$ fission fractions $F_{239}$ from 0.25 to 0.35, Daya Bay measures an average IBD yield and a fuel-dependent variation in IBD yield, $d\sigma_f/dF_{239}$. In addition, the yields and prompt spectra of the two dominant isotopes, $\mathrm{^{235}U}$ and $\mathrm{^{239}Pu}$, are extracted. Using SVD unfolding techniques, the $\bar{\nu}_e$ spectra are estimated from the prompt spectra of $\mathrm{^{235}U}$, $\mathrm{^{239}Pu}$, and the total measurement, thereby providing a model-independent reactor $\bar{\nu}_e$ spectrum prediction for the other reactor antineutrino experiments. Among them, the $\bar{\nu}_e$ spectrum for $\mathrm{^{235}U}$ is one of the most precise measurements, and the $\bar{\nu}_e$ spectra for $\mathrm{^{239}Pu}$ and total are the most precise measurements.
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