First Constraint on Coherent Elastic Neutrino-Nucleus Scattering in Argon
hep-ex
/ Authors
COHERENT Collaboration, D. Akimov, J. B. Albert, P. An, C. Awe, P. S. Barbeau, B. Becker, V. Belov, M. A. Blackston, A. Bolozdynya
and 70 more authors
B. Cabrera-Palmer, M. Cervantes, J. I. Collar, R. L. Cooper, J. Daughhetee, M. del Valle Coello, J. A. Detwiler, M. D'Onofrio, Y. Efremenko, E. M. Erkela, S. R. Elliott, L. Fabris, M. Febbraro, W. Fox, A. Galindo-Uribarri, M. P. Green, K. S. Hansen, M. R. Heath, S. Hedges, T. Johnson, M. Kaemingk, L. J. Kaufman, A. Khromov
/ Abstract
Coherent elastic neutrino-nucleus scattering (CEvNS) is the dominant neutrino scattering channel for neutrinos of energy $E_ν< 100$ MeV. We report a limit for this process using data collected in an engineering run of the 29 kg CENNS-10 liquid argon detector located 27.5 m from the Oak Ridge National Laboratory Spallation Neutron Source (SNS) Hg target with $4.2\times 10^{22}$ protons on target. The dataset yielded $< 7.4$ observed CEvNS events implying a cross section for the process, averaged over the SNS pion decay-at-rest flux, of $<3.4 \times 10^{-39}$ cm$^{2}$, a limit within twice the Standard Model prediction. This is the first limit on CEvNS from an argon nucleus and confirms the earlier CsI non-standard neutrino interaction constraints from the collaboration. This run demonstrated the feasibility of the ongoing experimental effort to detect CEvNS with liquid argon.