1205.0428 (XiangPan Ji et al.)

Evaluation of the Neutron Background in a Direct WIMP Detector with
Germanium Target using Reactor Neutrino Detector as Neutron Veto    [PDF]

XiangPan Ji, Ye Xu, JunSong Lin, Yulong Feng, JunCheng Wang, QiKun Li, DanNing Di

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: 984 Ge modules are 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 result show that the neutron background can decrease to O(0.01) events per year per tonne of high purity Germanium. 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 4$\times$$10^{-11}$ pb.

View original: http://arxiv.org/abs/1205.0428