Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 79, Issue 8, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-019-7160-2
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Funding
- IMPRS-PTFS
- research training group GRK 1940 of the Heidelberg University
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CONUS is a novel experiment aiming at detecting elastic neutrino-nucleus scattering in the almost fully coherent regime using high-purity germanium (Ge) detectors and a reactor as antineutrino source. The detector setup is installed at the commercial nuclear power plant in Brokdorf, Germany, at a short distance to the reactor core to guarantee a high antineutrino flux. A good understanding of neutron-induced backgrounds is required, as the neutron recoil signals can mimic the predicted neutrino interactions. Especially events correlated with the reactor thermal power are troublesome. On-site measurements revealed such a correlated, highly thermalized neutron field with a maximum fluence rate of (745 +/- 30)cm-2daylines. Using the measured neutron spectrum as input, Monte Carlo simulations demonstrated that the thermal power correlated field is successfully mitigated by the CONUS shield. The reactor-induced background contribution in the region of interest is exceeded by the expected signal by at least one order of magnitude assuming a realistic ionization quenching factor.
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