Latest Results and Status of CEvNS on LAr from the COHERENT Collaboration

Coherent Elastic Neutrino-Nucleus Scattering(CEvNS), first observed by the COHERENT Collaboration in 2017, is a neutral-current neutrino process. For neutrino energies below 100 MeV, it is the dominant cross-section. A precise measurement of the CEvNS cross-section will test new physics including constraints on nonstandard neutrino-quark interactions, the weak nuclear radius, and the particle nature of dark matter. In addition, development of CEvNS-sensitive technologies is useful for low-threshold WIMP dark matter searches and for sterile neutrino searches.

In order to obtain a precision measurement of the CEvNS cross-section, the COHERENT Collaboration has deployed a number of detectors with a range of target nuclei to the Spallation Neutron Source at Oak Ridge National Laboratory(ORNL). These include a 24-kg single-phase liquid argon detector, COH-Ar-10, which made the first low-N measurement of CEvNS in spring 2020. Using lessons learned from the previous result, we detail here an improved and expanded analysis over a larger data set. Further, we will touch on development of the ton-scale upgrade, COH-Ar-750.