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Published byDulcie Summers Modified over 9 years ago
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探测器自身放射性本底 CsI crystal CsI Powder
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脉冲形状甄别 PSD
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Pulse Shape Discrimination
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Quenching factor (ionization yield energy)
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沟道效应
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DAMA/LIBRA NaI(Tl) Scintillator at Gran Sasso : total 0.82 ton-year data Observe annual modulation in the 2- 6 keV single-hit signal band, total 11 cycles, > 8 Reject gamma by PSD No modulations at higher energy & for multiple-hits December 30 km/s ~ 232 km/s 60 ° June 30 km/s NaI 晶体实验
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Annual Modulation in single hit at 2-6 keV No Modulation for multiple hits at 2-6 keV No Modulation for single hit above 6 keV multiple-hits residual rate (green points) vs single-hit residual rate (red points) Single-Hit Power Spectrum
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Single Hit 2-6 keV Signal Region DAMA/NaI (7 years) + DAMA/LIBRA (4 years) Total exposure: 300555 kg day = 0.82 ton yr
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HP Ge detector / PC Ge detector High efficiency High resolution Large mass Pure material Low noise/ Low threshold
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Semiconductor detector materials HPGe 的体积,质量最大 ( Kg)
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HPGe 的能量分辨最好
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三种 HPGe 探测器 planar Coaxial detector VbVb p (n) p + (n + ) n + (p + ) S0S0 S1S1 p PCGe detector
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反冲电子或核的次级电子空穴的收集形成信号
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- V Q t Charge induction + +
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- V Q t + + + + + + Charge induction
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- V Q t + + ++++++ ++++++ + + Charge induction
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Planar detector with perfect charge transport - V Q ind t + -+ - + -+ - + -+ -
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