用高纯锗探测器测量AMoRE晶体材料的富钼粉末样品的本底活度
Measurement of the Background Activities of a 100Mo-enriched powder sample for AMoRE crystal material using a single high purity germanium detector
摘要：
先进的钼基稀有过程实验（AMoRE）研究了100 Mo在富集钼晶体中的无中微子双β（0ν \b{eta} \b{eta}）衰变。AMoRE晶体必须具有低水平的放射性污染，以获得能量接近100 Mo 0ν \b{eta} \b{eta}衰变的Q值的低背景信号。为了生产低放射性晶体，必须控制和量化用于形成晶体的原材料中的放射性污染物。富含100 Mo同位素的100 EnrMoO 3粉末特别令人感兴趣，因为它是晶体中100 Mo的来源。一台相对效率为100%的高纯锗探测器CC 1正在阳阳地下实验室运行。使用CCl，我们收集了1.6公斤的100 EnrMoO 3粉末样品富集到96.4%的100 Mo的γ能谱。分析了同位素228 Ac、228 Th、226 Ra和40 K的放射性。它们是天然存在的长寿命同位素，可以在目标区域产生AMORE背景信号。228 Ac和228 Th的放射性在90%置信水平（C.L.）下均< 1.0 mBq/kg。测量226 Ra的活性为5.1 \pm 0.4（stat）\pm 2.2（syst）mBq/kg。在90%C. L时，~（40）K活性<16.4mBq/kg。
英文摘要：
The Advanced Molybdenum-based Rare process Experiment (AMoRE) searches for neutrino-less double-beta (0ν\b{eta}\b{eta}) decay of 100Mo in enriched molybdate crystals. The AMoRE crystals must have low levels of radioactive contamination to achieve low background signals with energies near the Q-value of the 100Mo 0ν\b{eta}\b{eta} decay. To produce low-activity crystals, radioactive contaminants in the raw materials used to form the crystals must be controlled and quantified. 100EnrMoO3 powder, which is enriched in the 100Mo isotope, is of particular interest as it is the source of 100Mo in the crystals. A high-purity germanium detector having 100% relative efficiency, named CC1, is being operated in the Yangyang underground laboratory. Using CC1, we collected a gamma spectrum from a 1.6-kg 100EnrMoO3 powder sample enriched to 96.4% in 100Mo. Activities were analyzed for the isotopes 228Ac, 228Th, 226Ra, and 40K. They are long-lived naturally occurring isotopes that can produce background signals in the region of interest for AMoRE. Activities of both 228Ac and 228Th were < 1.0 mBq/kg at 90% confidence level (C.L.). The activity of 226Ra was measured to be 5.1 \pm 0.4 (stat) \pm 2.2 (syst) mBq/kg. The 40K activity was found as < 16.4 mBq/kg at 90% C.L.
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