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

Coherent elastic neutrino-nucleus scattering (CEvNS) is a neutral-current neutrino process in which a low-energy neutrino elastically scatters off a target nucleus. First proposed in 1974, CEvNS evaded detection until recently, despite being the dominant neutrino cross section below 100 MeV, due to the low resulting nuclear recoil. 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.

The COHERENT Collaboration made the first observation of CEvNS using a 14.6-kg CsI[Na] scintillating crystal in 2017, and again in 2020 using a 24-kg single-phase liquid argon detector named CENNS-10. Following this 2020 result, the liquid argon detector continued to operate, approximately tripling the size of the data set. In addition, the statistical analysis was improved using lessons learned. A summary of the previous results along with the current status of the CENNS-10 analysis will be presented.