Abstract
A direct WIMP (Weakly Interacting Massive Particle) detector with aneutron veto system is designed to better reject neutrons. Twoexperimental configurations are studied in the present paper: one isfor an Xe detector enclosed in a Gd-loaded scintillator and theother one is for an Xe detector placed inside a reactor neutrinodetector. The Gd-doped liquid scintillator (or the neutrinodetector) is used as a neutron veto device. The neutron backgroundsfor the two experimental designs have been estimated using Geant4simulations. The results show that the neutron backgrounds candecrease to O(0.1) events per year per tonne of liquid Xenon. Wecalculate the sensitivities to spin-independent WIMP-nucleon elasticscattering. An exposure of one tonne × year could reach across-section of about 6 × 10−11 pb.
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