# Estimation of reactor neutrino fluxes

## TL;DR

This paper reviews the current methods and challenges in estimating reactor neutrino fluxes, highlighting discrepancies between predictions and observations, and discussing recent experimental insights and systematic uncertainties.

## Contribution

It provides a comprehensive overview of the latest techniques, findings, and unresolved issues in reactor neutrino flux estimation, emphasizing the importance of precise measurements and isotope decay data.

## Key findings

- Discrepancies between observed and predicted neutrino rates and spectra.
- Improved understanding of systematic differences between fission electron and neutrino fluxes.
- Insights from isotope decay measurements and inter-reactor comparisons.

## Abstract

Reactor antineutrinos have been indispensable for our understanding of neutrino mass and mixing. At the same time, discrepancies between the observed and predicted reactor $\overline{\nu}_{e}$ rate and energy spectra have grown as the precision of these measurements has improved. Measurements of the electrons emitted following fission result in the most precise predictions for the corresponding $\overline{\nu}_{e}$ flux, and our understanding of the potential systematic differences between the fission $e^-$ and $\overline{\nu}_{e}$ fluxes has improved. Measurements of individual fission daughter isotopes and their decays are fraught with uncertainties, yet still provide insight into these discrepancies. Detailed comparisons of $\overline{\nu}_{e}$ measurements among reactors are also shedding new light on this topic.