Status of the NaI neutrino Experiment at the Tonne-scale (NaIνETe)

The COHERENT collaboration aims to measure several low energy neutrino interactions at the Spallation Neutron Source (SNS) at Oak Ridge National Lab (ORNL) with a collection of detector subsystems of various target nuclei. The initial goal of COHERENT was to measure Coherent Elastic Neutrino Nucleus Scattering (CEvNS), where a tens of MeV neutrino scatters off the nucleus as a whole with a keV scale nuclear recoil as the method of detection. COHERENT successfully made the first CEvNS measurement in 2017 on CsI and has continued to map out the neutron squared dependence of this cross section on various other targets. The pulsed nature of the SNS and known timing structure of the neutrinos allows for COHERENT to reduce backgrounds and make these low energy measurements. The NaI neutrino Experiment at the Tonne-scale (NaIvETe) plans to measure CEvNS on ²³ Na and continue the charged current measurement of the electron neutrino on ¹²⁷ I from its predecessor; the NaI neutrino Experiment (NaIvE), a 185-kg NaI[Tl] detector which began taking data in 2016. Two of the planned 5 modules of NaIvETe have been deployed at the SNS, each with 63 NaI[Tl] crystals of 7.7-kg for a total mass of over 2.4 tonnes. Each crystal is equipped with a dual-gain base to see both the keV scale CEvNS signal as well as the MeV scale charged current signal. The first modules have taken commissioning data with plans for the final modules to be deployed.