Characterization of the Response of CaWO4 on Recoiling Nuclei from Surface Alpha Decays
Characterization of the Response of CaWO4 on Recoiling Nuclei from Surface Alpha Decays
复制标题
CaWO4 对表面 α 衰变反冲核响应的表征
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
M. Stark
中科院分区：
文献类型：
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作者：
W. Westphal;C. Ciemniak;C. Coppi;F. Feilitzsch;A. Gütlein;C. Isaila;J. Lanfranchi;S. Pfister;W. Potzel;W. Rau;S. Roth;M. Stark
一个潜在的有害背景，试图直接暗物质探测的实验，如CRESST（=低温罕见事件搜索与超导温度计）实验是由反冲核从210 Po α衰变表面靠近检测器。为了表征CRESST中的这种背景，在TU München进行了校准测量。为此目的，CRESST探测器的优化版本已开发的38克CaWO 4晶体和一个单独的低温光探测器，都配备了Ir/Au过渡边缘传感器（TES）组成。同时测量声子信号和闪烁光从CaWO 4晶体允许区分电子和核反冲使用它们不同的光输出。使用210 Po源的第一次测量的意外结果可以借助于对类似系统进行的Monte Carlo模拟来理解。
A potentially harmful background for experiments attempting direct dark matter detection like the CRESST (= Cryogenic Rare Event Search with Superconducting Thermometers) experiment is caused by recoiling nuclei from 210Po alpha decays on surfaces close to the detector. In order to characterize this kind of background in CRESST, calibration measurements have been performed at the TU München. A for this purpose an optimized version of the CRESST detector has been developed consisting of a 38 g CaWO4 crystal and a separate cryogenic light detector, both equipped with Ir/Au transition edge sensors (TESs). The simultaneous measurement of the phonon signal and the scintillation light from the CaWO4 crystal allows to discriminate between electron and nuclear recoils using their different light outputs. The unexpected results of a first measurement with a 210Po source can be understood with the help of a Monte Carlo simulation performed for a similar system.