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Abstract:
The CONUS+ experiment aims to detect coherent elastic neutrino nucleus scattering (CEnNS) involving electron antineutrinos by the Leibstadt nuclear power plant (KKL). Serving as the successor to CONUS, CONUS+ features an enhanced experimental setup, including an upgraded muon veto to address the increased muon radiation at the new experimental site. This work includes on-site muon and gamma flux measurements, Monte Carlo simulations to assess the impact of incorporating an additional muon veto layer into the CONUS+ shielding, the commissioning process, and the subsequent installation within the experimental setup. Measurements revealed that the muon rate at KKL will be 2.6 times higher than in the former experimental location in Brokdorf. To maintain a comparable background level to CONUS, the muon rejection must be elevated to over 99%. Notably, the initial run of the muon veto in KKL has demonstrated a promising alignment with the expected performance.
