EVALUATION OF THE NEUTRON BACKGROUND IN AN HPGe TARGET FOR WIMP DIRECT DETECTION WHEN USING A REACTOR NEUTRINO DETECTOR AS A NEUTRON VETO SYSTEM
Ji XP., Xu Y., Lin JS., Feng Y., Li HL.

Received: April 23, 2013

DOI: 10.7868/S0044451013110035

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A direct WIMP (weakly interacting massive particle) detector with a neutron veto system is designed to better reject neutrons. The experimental configuration is studied in this paper involves 984 Ge modules placed inside a reactor-neutrino detector. The neutrino detector is used as a neutron veto device. The neutron background for the experimental design is estimated using the Geant4 simulation. The results show that the neutron background can decrease to O(0.01) events per year per tonne of high-purity germanium and it can be ignored in comparison with electron recoils.