Joint Isotope-Dependent Analysis of the Daya Bay, PROSPECT, and STEREO Reactor Antineutrino Spectra

The Daya Bay, PROSPECT, and STEREO experiments have made world leading measurements of the $^{235}$U antineutrino fission spectrum using liquid scintillator detectors located at nuclear reactors. The Daya Bay experiment has detected $\sim$3.5 million antineutrinos generated from power reactors fueled by a mixture of isotopic fuels, and PROSPECT and STEREO have detected $\sim$50,000 and $\sim$40,000 antineutrinos respectively generated by research reactors with highly enriched $^{235}$U fuel. By leveraging the two independent $^{235}$U measurements and the high-statistics Daya Bay measurement, both a more precise measurement of $^{235}$U as well as a better deconvolution of the power reactor fission spectrum into its individual isotopic components are possible. In this talk, I will present the current status of the joint spectral analyses between these experiments.