Study on NaI(Tl) crystal at −35 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e411" altimg="si37.svg"><mml:mo>°</mml:mo></mml:math>C for dark matter detection

We present the responses of a NaI(Tl) crystal in terms light yield and pulse shape characteristics nuclear recoil events at two different temperatures: 22 C (room temperature) -35 (low temperature). The is measured using 59.54 keV gamma-rays 241Am source relative to mean charge single photoelectrons. At low temperature, we measure 4.7 +/- 1.3% increase compared that room temperature. A significantly increased decay time also observed are neutrons from 252Cf those electron events. discrimination (PSD) power temperature found be improved entire energy range studied because scintillation characteristics. find an approximately 9% quenching factor alpha-induced events, which ratio alpha recoil, This supports possibility known have similar processes dark matter interaction. PSD enhance sensitivity for detection via matter-nuclei interactions.