Studies of scintillation properties of CaMoO4 at millikelvin temperatures
Studies of scintillation properties of CaMoO4 at millikelvin temperatures
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DOI：
10.1063/1.4922875
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发表时间：
2015-06
期刊：
影响因子：
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通讯作者：
X. Zhang;J. Lin;V. Mikhailik;H. Kraus
中科院分区：
文献类型：
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作者：
X. Zhang;J. Lin;V. Mikhailik;H. Kraus
在低温稀有事件搜索中，CaMoO 4作为闪烁靶的应用依赖于对这些探测器工作温度下材料闪烁特性的理解。我们设计并实现了一个检测模块，该模块具有由Cockcroft-Walton发生器供电的Hamamatsu（型号R8520-06）的低温光电倍增管。将含有CaMoO 4晶体的探测器模块放置在3 He/4 He稀释冰箱中，并用于测量CaMoO 4在毫开尔文温度范围内的闪烁特性。在最低温度下，对~（57）Co源122 keV的能量分辨率为30%（FWHM），快、慢衰变常数分别为40.6 ± 0.8us和3410 ± 50 us。根据发射中心的三能级模型，讨论了CaMoO 4衰减动力学的温度变化
Application of CaMoO4 as a scintillation target in cryogenic rare event searches relies on the understanding of scintillation properties of the material at the temperatures at which these detectors operate. We devised and implemented a detection module with a low-temperature photomultiplier from Hamamatsu (model R8520-06) powered by a Cockcroft-Walton generator. The detector module containing the CaMoO4 crystal was placed in a 3He/4He dilution refrigerator and used to measure scintillation characteristics of CaMoO4 in the millikelvin temperature range. At the lowest temperature achieved, the energy resolution of CaMoO4 for 122 keV from a 57Co source is found to be 30% (FWHM), and the fast and slow decay constants are 40.6+-0.8 us and 3410+-50 us, respectively. The temperature variation of the CaMoO4 decay kinetics is discussed in terms of a three-level model of the emission center