Neutrino Constraints and the ATOMKI X17 Anomaly

Recent data from the ATOMKI group continues to confirm their claim of the existence of a new $\sim 17$ MeV particle. We review and numerically analyze the data and then put into context constraints from other experiments, notably neutrino scattering experiments such as the latest reactor anti-neutrino coherent elastic neutrino nucleus scattering data and unitarity constraints from solar neutrino observations. We show that minimal scenarios are disfavored and discuss the model requirements to evade these constraints.