SMuK 2023 – scientific programme
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T: Fachverband Teilchenphysik
T 68: Neutrinos, Dark Matter VIII
T 68.4: Talk
Wednesday, March 22, 2023, 16:35–16:50, POT/0006
The XENONnT Gd-loaded water n-veto detector and purification system — •francesco Lombardi for the XENON collaboration — flombard@uni-mainz.de
The nuclear recoil scattering by Neutrons is the most dangerous background for the XENONnT experiment because they can mimic the expected Dark Matter signal: the single nuclear recoil scattering. To increase the Neutron tagging efficiency, the Muon Veto Water tank has been modified by introducing an additional neutron veto detector surrounding the XENON time projection chamber (TPC) and, in the next phase of the experiment, the 700 ton of water of the Cherenkov detector will be loaded with a solution at 0.48% of Gadolinium Sulfate Octahydrate salt (Gd2(SO4)3 · 8H2O ), corresponding to a percentage of 0.2% of Gadolinium of the total mass. In the next phase, the addiction of Gadolinium at 0.2%, will increase the neutron capture efficiency from the 74% of pure water to the 90% of the new solution. Together with the infrastructure of the neutron veto detector, we will also present the filtration plant for purification system and the relative automatic control.