• Easy to get large mass with an affordable cost • annual modulation study
• High light yield ~60,000/MeV
• Pulse shape discrimination • better gamma rejection than NaI(Tl)
裸晶体单面输出(下侧PMT),上侧2个PMT符合触发
Cs-能谱
2.5x2.5x2.5cm方块晶体 ESR膜包装窗口输出
2.5x2.5x2.5cm方块晶体 裸晶体单面输出
Alpha 粒子产生的电流波形 Gamma 粒子产生的电流波形
脉冲波形分析 E-tmean =
Fe55能谱标定
10kev波形比较
DAMA/1 ton NaI annual modulation R&D
LNGS
INFN-ITALY
NAIAD
NaI
PSD
concluded Boulby
UK
HDMS
Ge
ionization
concluded
LNGS
INFN-ITALY
KIMS
CsI
PSD
R&D
Y2L
Korea
Caf2-Kamioka CaF2
Peak emission(nm) 550
Hygroscopicity
slight
NaI(Tl)
3.67 ~230
415 strong
Pulse Shape Discrimination
t Aiti Ai
4<E<10 keV
summary
1.从大体积灵敏探测和one by one 事列可分 析要求,惰性液体方案和晶体方案是我们研 讨的方向.