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The Coherent Neutrino-Nucleus Interaction Experiment (CONNIE) uses low-noisefully depleted charge-coupled devices (CCDs) with the goal of measuringlow-energy recoils from coherent elastic scattering (CE$\nu$NS) of reactorantineutrinos with silicon nuclei and testing nonstandard neutrino interactions(NSI). We report here the first results of the detector array deployed in 2016,considering an active mass 47.6 g (8 CCDs), which is operating at a distance of30 m from the core of the Angra 2 nuclear reactor, with a thermal power of 3.8GW. A search for neutrino events is performed by comparing data collected withreactor on (2.1 kg-day) and reactor off (1.6 kg-day). The results show noexcess in the reactor-on data, reaching the world record sensitivity down torecoil energies of about 1 keV (0.1 keV electron-equivalent). A 95% confidencelevel limit for new physics is established at an event rate of 40 times the oneexpected from the standard model at this energy scale. The results presentedhere provide a new window to low-energy neutrino physics, allowing one toexplore for the first time the energies accessible through the low threshold ofCCDs. They will lead to new constrains on NSI from the CE$\nu$NS ofantineutrinos from nuclear reactors.

Exploring low-energy neutrino physics with the Coherent Neutrino Nucleus Interaction Experiment (CONNIE)