A water tank equipped with photomultipliers allows to subtract background signals in experiments that are searching for elusive particles.
The muon veto is used in different detectors searching for dark matter or solar neutrinos. It allows to tag and subsequently remove signals due to muons, penetrating particles produced by cosmic rays. The veto uses a physical phenomenon based on the emission of light track when the muons pass through ultra pure water. The emitted light is detected by photomultipliers and the signals are sent to an acquisition system for further analysis.
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