Description
The Coherent Neutrino-Nucleus Interaction Experiment (CONNIE) is a neutrino experiment located at a distance of 30 m from the Angra 2 nuclear reactor (3.8 $\rm{GW_{th}}$) in Brazil. It uses low-noise, fully depleted charge-coupled devices (CCDs) to detect sub-keV energy recoils from CE$\nu$NS (coherent elastic neutrino-nucleus scattering) with silicon nuclei. The experiment has been active since 2016, maintaining a noise below 2 e$^-$ RMS with an active mass of ~50 g. The results derived from the data accumulated during the 2016–2018 run, with the reactor on and off, set a 95 C.L on the CE$\nu$NS signal. They were used to impose limits on the NSI parameters, which are competitive in the lower mass region of light neutral mediators. The experiment has been upgraded to host 2 skipper CCD sensors, it has been operating for ~4 months with these new generation detectors, achieving a noise lower than 0.2 e$^-$ RMS. Here, we report the latest results of CONNIE before the upgrade, based on the analysis of data collected in 2019, with an increased signal-to-noise ratio thanks to a different (1 x 5) binning in one direction. We also present the current status of the experiment and give an overview of the upcoming year of operations.
| Collaboration | CONNIE |
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