Evidence of Coherent Elastic Neutrino-Nucleus Scattering with COHERENT’s Germanium Array
S. Adamski, Myunggeun Ahn, P. S. Barbeau, V. Belov, I. Bernardi, C. Bock, A. Bolozdynya, R. Bouabid, J. Browning, B. Cabrera-Palmer, N. Cedarblade-Jones, Angela Rivera, E. Conley, V. da Silva, J. Daughhetee, J. A. 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, Hwancheol Jeong, Bankole A. Johnson, T. Johnson, H. F. Jones, A. Khromov, D. J. Kim, A. M. Konovalov, E. Kozlova, A. Kumpan, O. Kyzylova, Y. Lee, Gordon Li, L. Li, J. M. Link, J. Liu, M. Luxnat, Adryanna Major, Kulwinder Singh Mann, D. M. Markoff, Carolyn Mattingly, J. Moye, P. E. Mueller, J. Newby, N. Ogoi, J. O’Reilly, D. S. Parno, D. Pérez–Loureiro, D. Pershey, C. G. Prior, J. Queen, R. Rapp, H. Ray, O. Razuvaeva, D. Reyna, G. C. Rich, D. Rudik, J. Runge, D. J. Salvat, J. Sander, K. Scholberg, A. Shakirov, G. Simakov, W. M. Snow, V. Sosnovtsev, M. Stringer, T. Subedi, B. Suh, B. Sur, R. Tayloe, K. Tellez-Giron-Flores, Y.-T. Tsai, E. E. van Nieuwenhuizen, C. J. Virtue, G. Visser, K. Walkup, E. M. Ward, T. Wongjirad, Y. Yang, J. Yoo, C.-H. Yu, A. Zaalishvili
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 an on-beam excess of 20.6_{-6.3}^{+7.1} counts with a total exposure of 10.22 GWhkg, and we reject the no-CEvNS hypothesis with 3.9σ significance. The result agrees with the predicted standard model of particle physics signal rate within 2σ.