A measurement of the inclusive cross section of the electron neutrino charged-current interactions on ¹²⁷I.

A measurement of the inclusive cross section of the electron neutrino charged-current interactions on ¹²⁷I can probe the quenching of g_A, the axial-vector coupling constant, which affects the rate of neutrinoless double beta decays. Before 2000, at the Los Alamos Meson Production Facility (LAMPF), a measurement of the exclusive and flux-averaged cross section was made, whose statistical error was large. To make a first measurement of the inclusive cross section with low statistical uncertainty, a 185 kg NaI[Tl] prototype was deployed by the COHERENT collaboration at the Spallation Neutron Source. To further improve the signal-to-noise ratio, a four-class XGBoost model was developed. To address the non-linearity of NaI[Tl] crystals at high energies, calibrations using the Michel spectrum from stopped mu+ decays were performed. Data analysis is ongoing and we expect to open the blinded data soon. The latest COHERENT NaI results will be presented.