AMoRE-II的本底投影与灵敏度
Projected background and sensitivity of AMoRE-II
AI总结：
本文介绍AMoRE-II实验搜寻无中微子双贝塔衰变的本底与灵敏度研究，通过GEANT4模拟验证423个晶体阵列配置满足本底要求，实现覆盖倒置质量层级的半衰期灵敏度目标。
摘要：
AMoRE-II旨在利用在低温系统中运行的423个Li$_2$$^{100}$MoO$_4$晶体阵列，搜寻无中微子双贝塔衰变，这是Advanced Molybdenum-based Rare process Experiment (AMoRE)的主要阶段。AMoRE计划分三个阶段运行：AMoRE-pilot、AMoRE-I和AMoRE-II。AMoRE-II目前正在位于韩国Jeongseon地下约1000米深的Yemi Underground Laboratory进行安装。AMoRE-II的目标是达到 $T^{0νββ}_{1/2}$ $\sim$ 6 $\times$ 10$^{26}$ 年，对应的有效马约拉纳质量为15 - 29 meV，覆盖所有倒置质量层级区域。为实现这一目标，必须充分理解实验配置的本底水平以及gamma和beta事件的潜在本底来源。我们使用GEANT4工具包对所有实验配置和潜在源进行了密集的Monte Carlo模拟。我们报告了在感兴趣区域(ROI)中满足AMoRE-II 10$^{-4}$counts/(keV$\cdot$kg$\cdot$yr)要求的估计本底水平，并展示了基于模拟研究的投影半衰期灵敏度。
英文摘要：
AMoRE-II aims to search for neutrinoless double beta decay with an array of 423 Li$_2$$^{100}$MoO$_4$ crystals operating in the cryogenic system as the main phase of the Advanced Molybdenum-based Rare process Experiment (AMoRE). AMoRE has been planned to operate in three phases: AMoRE-pilot, AMoRE-I, and AMoRE-II. AMoRE-II is currently being installed at the Yemi Underground Laboratory, located approximately 1000 meters deep in Jeongseon, Korea. The goal of AMoRE-II is to reach up to $T^{0νββ}_{1/2}$ $\sim$ 6 $\times$ 10$^{26}$ years, corresponding to an effective Majorana mass of 15 - 29 meV, covering all the inverted mass hierarchy regions. To achieve this, the background level of the experimental configurations and possible background sources of gamma and beta events should be well understood. We have intensively performed Monte Carlo simulations using the GEANT4 toolkit in all the experimental configurations with potential sources. We report the estimated background level that meets the 10$^{-4}$counts/(keV$\cdot$kg$\cdot$yr) requirement for AMoRE-II in the region of interest (ROI) and show the projected half-life sensitivity based on the simulation study.
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