Abstract
A direct WIMP (Weakly Interacting Massive Particle) detector with a neutron veto system is designed to better reject neutrons. An experimental configuration is studied in the present paper: a WIMP detectors with CsI(Na) target is placed inside a reactor neutrino detector. The neutrino detector is used as a neutron veto device. The neutron background for the experimental design has been estimated using the Geant4 simulation. The results show that the neutron background can decrease to O(0.01) events per year per tonne of CsI(Na). We calculate the sensitivity to spin-independent WIMP-nucleon elastic scattering. An exposure of one tonne $\times$ year could reach a cross-section of about 3$\times$$10^{-11}$ pb.
Highlights
It is indicated by seven year Wilkinson Microwave Anisotropy Probe data combined with measurements of baryon acoustic oscillations and Hubble constant that ∼83 % of the matter content in the Universe is non-baryonic dark matter [1,2,3]
We designed an experimental configuration: four Weakly Interacting Massive Particle (WIMP) detectors with Cesium iodide (CsI)(Na) target are individually placed inside four reactor neutrino detector modules which are used as a neutron veto system
Since neutrino detectors are fairly close to nuclear reactors in reactor neutrino experiments, a large number of reactor neutrinos will pass through the detectors, and nuclear recoils will be produced by neutrino elastic scattering off target nucleus in the WIMP detectors
Summary
It is indicated by seven year Wilkinson Microwave Anisotropy Probe data combined with measurements of baryon acoustic oscillations and Hubble constant that ∼83 % of the matter content in the Universe is non-baryonic dark matter [1,2,3]. Interacting Massive Particles (WIMPs) [4], predicted by extensions of the standard model of particle physics, are a well-motivated class of candidates for dark matter. They are distributed in the halo surrounding the Milky Way. WIMPs may be directly detected through measuring nuclear recoils in terrestrial detectors produced by their scattering off target nuclei [5,6,7]. We designed an experimental configuration: four WIMP detectors with CsI(Na) target are individually placed inside four reactor neutrino detector modules which are used as a neutron veto system. The neutron background for this design are estimated using the Geant4 [21] simulation
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