Speaker
Description
This poster presents a joint determination of the spectra of the reactor antineutrinos resulting from fissions of $^{235}U$ and $^{239}Pu$ by the Daya Bay and PROSPECT experiments. In the Daya Bay experiment, the antineutrinos were generated by six low-enriched uranium (LEU) commercial reactors with 2.9 GW thermal power each and detected by eight antineutrino detectors deployed in two near and one far underground experimental halls . In the PROSPECT experiment, the antineutrinos were generated by an 85 MW thermal power high-enriched uranium (HEU) research reactor and detected by a 4-ton $^{6}Li$-loaded liquid scintillator (LiLS) detector. This is the first combined measurement from experiments based on LEU and HEU reactors. With a joint analysis of both experiments' data, the precision of the derived $^{235}U$ spectrum is improved beyond that individually observed by either experiment, and the degeneracy between derived $^{235}U$ and $^{239}Pu$ spectra is reduced below that from Daya Bay alone. In addition, the antineutrino energy spectrum of $^{235}U$ is unfolded with the Wiener-SVD method, providing a more precise data-based prediction for the other reactor antineutrino experiments.
| Collaboration | Daya Bay Collaboration |
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