Secondary scintillation yield from gaseous micropattern electron multipliers in direct Dark Matter detection

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• 作者：C.M.B. Monteiro ; A.S. Conceiç ; ã ; o ; F.D. Amaro ; J.M. Maia ; A.C.S.S.M. Bento ; L.F.R. Ferreira ; J.F.C.A. Veloso ; J.M.F. dos Santos ; A. Breskin ; R. Chechik
• 关键词：Xenon scintillation ; Dual-phase detectors ; Dark Matter ; GEM ; MHSP ; Avalanche photodiodes
• 刊名：Physics Letters B
• 出版年：2009
• 出版时间：22 June 2009
• 年：2009
• 卷：677
• 期：3-4
• 页码：133-138
• 全文大小：796 K

文摘

Efforts are being made in direct Dark Matter search experiments to detect the primary ionisation in the liquid by extracting the electrons to the gas phase and use the secondary ionization produced in the micropattern electron multipliers for signal amplification in noble-liquid dual-phase TPCs. We have studied the secondary scintillation yield of a single Gas Electron Multiplier (GEM) and of a Micro-Hole & Strip Plate (MHSP) for xenon at room temperature. Values for secondary scintillation yield between 5.0×10³ and 1.3×10³ photons per primary electron were obtained for the GEM and between 7.2×10⁴ and 1.8×10³ photons per primary electron for the MHSP, as the pressure increased from 1.0 to 2.5 bar in the GEM-setup and from 1.0 to 3.3 bar in the MHSP-setup, respectively. These values can be more than one order of magnitude higher than what has been obtained in the uniform-field scintillation gaps of the XENON and ZEPLIN-III experiments. Although in the present setups the amount of secondary scintillation obtained is sufficient in view of the use of PMTs, if a different type of readout is considered, such as large area avalanche photodiodes, it will be important to increase the amount of secondary scintillation. The attained results demonstrate the clear advantage of reading the secondary scintillation instead of the charge produced in the electron avalanches of micropattern electron multipliers, in low-background and low-rate experiments, as is the case in direct Dark Matter search.