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A direct WIMP (Weakly Interacting Massive Particle) detector with a neutronveto system is designed to better reject neutrons. An experimentalconfiguration is studied in the present paper: a WIMP detectors with CsI(Na)target is placed inside a reactor neutrino detector. The neutrino detector isused as a neutron veto device. The neutron background for the experimentaldesign has been estimated using the Geant4 simulation. The results show thatthe neutron background can decrease to O(0.01) events per year per tonne ofCsI(Na). We calculate the sensitivity to spin-independent WIMP-nucleon elasticscattering. An exposure of one tonne $\times$ year could reach a cross-sectionof about 3$\times$$10^{-11}$ pb.

Evaluation of the neutron background in CsI target for WIMP direct detection when using a reactor neutrino detector as a neutron veto system