Evidence of Coherent Elastic Neutrino-Nucleus Scattering with COHERENT's Germanium Array
hep-ex
/ Authors
S. Adamski, M. Ahn, P. S. Barbeau, V. Belov, I. Bernardi, C. Bock, A. Bolozdynya, R. Bouabid, J. Browning, B. Cabrera-Palmer
and 78 more authors
N. Cedarblade-Jones, A. I. Colón Rivera, E. Conley, V. da Silva, J. Daughhetee, J. Detwiler, K. Ding, M. R. Durand, Y. Efremenko, S. R. Elliott, A. Erlandson, L. Fabris, A. Galindo-Uribarri, M. P. Green, J. Hakenmüller, M. R. Heath, S. Hedges, H. Jeong, B. A. Johnson, T. Johnson, H. Jones, A. Khromov, D. Kim,
/ Abstract
We report the first detection of coherent elastic neutrino-nucleus scattering (CEvNS) on natural germanium, measured at the Spallation Neutron Source at Oak Ridge National Laboratory. The Ge-Mini detector of the COHERENT collaboration employs large-mass, low-noise, high-purity germanium spectrometers, enabling excellent energy resolution, and an analysis threshold of 1.5 keV electron-equivalent ionization energy. We observe a on-beam excess of 20.6 +7.1 -6.3 counts with a total exposure of 10.22 GWhkg and we reject the no-CEvNS hypothesis with 3.9 sigma significance. The result agrees with the predicted standard model of particle physics signal rate within 2 sigma.