Speaker
Description
The Coherent Neutrino-Nucleus Interaction Experiment (CONNIE) uses the silicon (Si) in thick fully depleted charge-coupled devices (CCDs) as target to search for the coherent elastic scattering of reactor antineutrinos off nuclei (CEvNS) and search for new physics. Located at 30 m from the core of the Angra 2 nuclear reactor in Rio de Janeiro, Brazil, CONNIE has run on the site since 2016 undergoing various upgrades. In 2021 two sub-electron readout noise Skipper-CCDs (total Si mass of 0.5 g) were installed and new techniques were developed allowing the experiment to reach an energy threshold of 15 eV. Data collected in 2021 and 2022 with a 14.9 (3.5) g-day exposure with reactor-on (off) were used to obtain an upper limit on CEvNS rate comparable with those of the standard CCD runs with higher exposures. Improved limits on models with light mediators have been obtained, as well as the best limits on DM-electron scattering from a surface experiment. In addition, world-leading limits on the charge of millicharged particles with masses in the range from 1 eV to 10 MeV have been imposed frum a comprehensive analysis and the combination of data from another Skipper-CCD experiment at the Atucha II reactor in Argentina. In 2024 a new Multi-Chip Module (MCM) with 16 Skipper-CCDs with the Oscura experiment design was installed, increasing the Si mass to 8g. In this talk we present the status and latest results from the experiment, the progress on the commissioning of the MCM and comment on the future prospects for detecting CEvNS with Skipper-CCDs.
| Collaboration you are representing | CONNIE |
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