BINGO：用于降低辐射热测量计0νββ实验本底的创新组装方案
BINGO innovative assembly for background reduction in bolometric $0νββ$ experiments
AI总结：
BINGO项目通过创新探测器组装、低温光电探测器和主动反符合技术，将辐射热测量计0νββ实验的本底指数降至10^{-5} counts/(keV kg yr)量级，并在Canfranc地下实验室验证了容纳四块Li₂MoO₄晶体的原型模块性能。
摘要：
BINGO项目旨在为大型辐射热测量计无中微子双贝塔衰变实验奠定基础，使其能够在几meV水平上研究有效马约拉纳中微子质量。该项目专注于开发创新技术（探测器组装、低温光电探测器和主动反符合系统），以在感兴趣区域实现约10^{-5} counts/(keV kg yr)量级的极低本底指数。BINGO的演示装置MINI-BINGO旨在研究具有前景的双贝塔衰变同位素^{100}Mo和^{130}Te，它将由Li₂MoO₄和TeO₂晶体组成，这些晶体与辐射热测量计光探测器耦合，并被基于Bi₄Ge₃O₁₂的反符合系统包围。这将使我们能够通过光产额选择来排除由α放射性核素表面污染引起的辐射热测量计中的显著本底，并抑制其他本底来源，例如β放射性核素表面污染、外部γ放射性以及由本底事件随机符合引起的堆积效应。本文描述了面向BINGO目标的一项研发计划，特别聚焦于一种创新组装方案的开发，该方案旨在减少探测器视线范围内的被动材料，而这些被动材料预计将成为下一代辐射热测量计实验中的主要本底来源。我们展示了两个原型模块的性能——总共容纳四块立方体（边长4.5 cm）Li₂MoO₄晶体——它们在西班牙Canfranc地下实验室中运行，该实验室位于为CROSS双贝塔衰变实验开发的设施内。
英文摘要：
BINGO is a project aiming to set the grounds for large-scale bolometric neutrinoless double-beta-decay experiments capable of investigating the effective Majorana neutrino mass at a few meV level. It focuses on developing innovative technologies (a detector assembly, cryogenic photodetectors and active veto) to achieve a very low background index, of the order of $10^{-5}$ counts/(keV kg yr) in the region of interest. The BINGO demonstrator, called MINI-BINGO, is designed to investigate the promising double-beta-decay isotopes $^{100}$Mo and $^{130}$Te and it will be composed of Li$_2$MoO$_4$ and TeO$_2$ crystals coupled to bolometric light detectors and surrounded by a Bi$_4$Ge$_3$O$_{12}$-based veto. This will allow us to reject a significant background in bolometers caused by surface contamination from $α$-active radionuclides by means of light yield selection and to mitigate other sources of background, such as surface contamination from $β$-active radionuclides, external $γ$ radioactivity, and pile-up due to random coincidence of background events. This paper describes an R\&D program towards the BINGO goals, particularly focusing on the development of an innovative assembly designed to reduce the passive materials within the line of sight of the detectors, which is expected to be a dominant source of background in next-generation bolometric experiments. We present the performance of two prototype modules -- housing four cubic (4.5-cm side) Li$_2$MoO$_4$ crystals in total -- operated in the Canfranc underground laboratory in Spain within a facility developed for the CROSS double-beta-decay experiment.
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