CAS, Inst High Energy Phys, Beijing 100039, Peoples R China
; Acad Sinica, Inst Phys, Taipei 11529, Taiwan
; Taiwan Natl Univ, Dept Phys, Taipei 10600, Taiwan
Detection of dark matter using CsI(Tl) scintillating crystal as the detector has gathered more and more interests. In this paper, the quenching factor of nuclear recoils induced by incident neutron beam was measured based on Pulse Shape Discrimination (PSD) method to identify events of nuclear recoils from background. It is shown that the quenching factor increases with the decreased recoil energy in the range of 7 keV to 132 keV. This result shows the great advantage of CsI(Tl) crystal detector in detecting of dark matter.