Neutron Beam Tests of $CsI(Na)$ and $CaF_{2}(Eu)$ Crystals for Dark   Matter Direct Search
  In recent decades, inorganic crystals have been widely used in dark matter direct search experiments. To contribute to the understanding of the capabilities of $CsI(Na)$ and $CaF_{2}(Eu)$ crystals, a mono-energetic neutron beam is utilized to study the properties of nuclear recoils, which are expected to be similar to signals of dark matter direct detection. The quenching factor of nuclear recoils in $CsI(Na)$ and $CaF_{2}(Eu)$, as well as an improved discrimination factor between nuclear recoils and ${\gamma}$ backgrounds in $CsI(Na)$, are reported. 
Cong Guo, Xinhua Ma, Zhimin Wang, Jie Bao, Changjiang Dai, Mengyun   Guan, Jinchang Liu, Zuhao Li, Jie Ren, Xichao Ruan, Cha...
physics.ins-det astro-ph.IM hep-ex