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Electron and gamma background in CRESST detectors

机译:CRESST探测器中的电子和伽马背景

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The CRESST experiment monitors 300 g CaWO4 crystals as targets for particle interactions in an ultra low background environment. In this paper, we analyze the background spectra that are recorded by three detectors over many weeks of data taking. Understanding these spectra is mandatory if one wants to further reduce the background level, and allows us to cross-check the calibration of the detectors. We identify a variety of sources, such as intrinsic contaminations due to primordial radioisotopes and cosmogenic activation of the target material. In particular, we detect a 3.6 keV X-ray line from the decay of Ca-41 with an activity of (26 +/- 4) mu Bq, corresponding to a ratio Ca-41/Ca-40 = (2.2 +/- 0.3) x 10(-16).
机译:CRESST实验监控300 g CaWO4晶体作为超低背景环境中粒子相互作用的目标。在本文中,我们分析了三个探测器在数周的数据采集中记录的背景光谱。如果要进一步降低背景水平,则必须了解这些光谱,并允许我们交叉检查检测器的校准。我们确定了各种来源,例如由于原始放射性同位素和目标物质的宇宙成因活化引起的内在污染。特别是,我们从Ca-41的衰变中检测到一条3.6 keV的X射线线,其活性为(26 +/- 4)μBq,对应于Ca-41 / Ca-40 =(2.2 +/-) 0.3)x 10(-16)。

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