Nuclear reactor antineutrinos, hard to detect, but with a traceable lineage.

Nuclear reactors are prolific sources of electrons antineutrinos, a feature that has considerably helped to improve our understanding of the weak nuclear interaction. There is currently an important number of experiments measuring the antineutrino spectrum generated by reactors. While most of them are designed to measure neutrino oscillation parameters and understand the possible existence of additional neutral leptons, a few are developing the technology to monitor reactors. Nuclear databases play a very important in predicting a reactor antineutrino spectrum; the need to improve them to better account for the antineutrino spectrum has motivated many experiments to precisely measure beta decays and fission yields. In this presentation, we will review the data needs to further refine our calculations, the related benefits, such as improvements in decay heat estimates, as well as the development of correlation matrices