Measurement of electron-neutrino charged-current interactions on ¹²⁷I with the COHERENT NaIvE detector

The COHERENT collaboration's NaI Neutrino Experiment (NaIvE) has been measuring electron-neutrino charged-current interactions on ¹²⁷I (veCC-¹²⁷I) at the Spallation Neutron Source since 2016. Using 185-kg of NaI[Tl] scintillator, COHERENT has observed evidence of veCC-¹²⁷I interactions at 5.8 sigma, measuring the inclusive cross section in addition to exclusive cross sections associated with 0 and ≥1 neutron emission. The collaboration has compared its measurement with predictions generated by the MARLEY event generator using experimentally measured B(GT) distributions, and observes a significant suppression in its measurement compared with theory. This measurement adds to the limited existing data set of low-energy inelastic neutrino-nucleus interactions, and furthers the understanding of neutrino-nucleus interactions at energies relevant for solar and supernova neutrino detection. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.