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First Measurement of Coherent Elastic Neutrino-Nucleus Scattering on Argon

https://doi.org/10.1103/PhysRevLett.126.012002

Akimov, D ; Albert, J.B. ; An, P ; C. Awe, P. S. Barbeau ; B. Becker ; V. Belov ; I. Bernardi ; M. A. Blackston ; L. Blokland ; A. Bolozdynya ; et al ( January 2021 , Physical review letters)

We report the first measurement of coherent elastic neutrino-nucleus scattering (CEvNS) on argon using a liquid argon detector at the Oak Ridge National Laboratory Spallation Neutron Source. Two independent analyses prefer CEvNS over the background-only null hypothesis with greater than 3σ significance. The measured cross section, averaged over the incident neutrino flux, is (2.2±0.7)×10−39 cm2—consistent with the standard model prediction. The neutron-number dependence of this result, together with that from our previous measurement on CsI, confirms the existence of the CEvNS process and provides improved constraints on nonstandard neutrino interactions.
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