Simulations of background sources in AMoRE-I experiment
A. Luqman, D. H. Ha, J. J. Lee, E. J. Jeon, H. S. Jo, H. J. Kim, Y. D. Kim, Y. H. Kim, V. V. Kobychev, H. S. Lee, H. K. Park, K. Siyeon, J. H. So, V. I. Tretyak, Y. S. Yoon
发表信息：
Nuclear Instruments and Methods in Physics Research A 855 (2017) 140
The first phase of the Advanced Mo-based Rare Process Experiment (AMoRE-I), an experimental search for neutrinoless double beta decay (0$νββ$) of $^{100}$Mo in calcium molybdate (CMO) crystal using cryogenic techniques, is in preparation at the YangYang underground laboratory (Y2L) in South Korea. A GEANT4 based Monte Carlo simulation was performed for background estimation in the first-phase the AMoRE-I detector and shield configuration. Background sources such as $^{238}$U, $^{232}$Th, $^{40}$K, $^{235}$U, and $^{210}$Pb were simulated from inside the crystals, surrounding materials, outer shielding walls of the Y2L cavity. The estimated background rate in the region of interest was found to be $< 1.5 \times 10^{-3}$ counts/keV/kg/yr (ckky). The effects of random coincidences between background and two-neutrino double beta decay of $^{100}$Mo were estimated as a potential background source and its estimated rate was $< 2.3 \times 10^{-4}$ ckky.
Measurement of the Background Activities of a 100Mo-enriched Powder Sample for an AMoRE Crystal Material by using Fourteen High-Purity Germanium Detectors
A feasibility study of extruded plastic scintillator embedding WLS fiber for AMoRE-II muon veto
AMoRE-II是高级钼基稀有过程实验的第二阶段，目的是使用约200公斤含氘低温探测器寻找100 Mo同位素的无中微子双β衰变。AMoRE-II需要使用各种方法将本底水平保持在10-5计数/keV/kg/年以下，以最大限度地提高灵敏度。方法之一是在远离宇宙射线背景的地下深处进行实验。AmoRE-II将在Yemilab运行，深度约为1，000米。然而，即使在如此深的地下环境中，仍然存在幸存的宇宙μ子，它们会影响测量，应尽可能排除。μ子否决探测器是必要的，以拒绝μ子诱导的粒子进入内部探测器，其中低温探测器位于。我们已经研究了使用挤出塑料闪烁体和波长漂移光纤与SiPM一起作为μ子否决系统的可能性。我们发现最佳的结构是两层塑料分离器（PS，150 cm x 25 cm x 1.2 cm），每个槽有两个WLS光纤，它可以很好地分离放射性γ，μ子探测效率在99.4%以上。基于700米深地下原型测量的预期通量，我们发现，在Yemilab的AMoRE-II的μ子否决系统的死时间为1 ms否决窗口的0.6%的整个μ子事件。
Improved data analysis of the internal background measurements of 40Ca100MoO4 scintillation crystals
无中微子双β（0n2b）衰变实验的灵敏度主要取决于探测器的内本底，而内本底又取决于材料的纯度和本底事件的选择性。AMoRE（Advanced Mo based Rare process Experiment）合作计划使用40Ca100MoO4闪烁晶体作为探测器，用于寻找100Mo同位素的0n2b衰变。本文的目的是利用阳阳地下实验室的低本底装置对40Ca_（100）MoO_4闪烁元件的内本底进行进一步的研究。本文以40Ca_（100）MoO_4晶体本征本底测量的最新结果和分析数据为例，提出了本底事例选取的新方法，作为新技术应用的一个实例。
