论文标题
Saber South实验的模拟和背景表征
Simulation and background characterisation of the SABRE South experiment
论文作者
论文摘要
SABER（具有主动背景排斥钠的碘化钠）是基于无线电NAI（TL）晶体阵列的直接检测暗物质实验。该实验旨在实现超低背景速率，其主要目标是确认或反驳Dama/Libra实验的结果。 SABER原则阶段于2020 - 2021年在意大利的Gran Sasso国家实验室（LNGS）进行。下一阶段由两个全面实验组成：澳大利亚的Stawell地下物理实验室的Saber South和LNGS的Saber North。本文着重于Saber South，并介绍了检测器的详细模拟，该模拟用于表征包括Dama/Libra类似调制的暗物质搜索背景。我们估计能量范围内的0.72 cpd/kg/kev $ _ {ee} $ 1 $ - $ 6 kev $ _ {ee} $的总体背景主要是由于晶体中的放射性污染。鉴于这种背景水平并考虑到Saber South的目标质量为50公斤，我们希望在数据获取的2。5年内将Dama/Libra调制（确认）在$ 4〜（5）σ$中排除。
SABRE (Sodium iodide with Active Background REjection) is a direct detection dark matter experiment based on arrays of radio-pure NaI(Tl) crystals. The experiment aims at achieving an ultra-low background rate and its primary goal is to confirm or refute the results from the DAMA/LIBRA experiment. The SABRE Proof-of-Principle phase was carried out in 2020-2021 at the Gran Sasso National Laboratory (LNGS), in Italy. The next phase consists of two full-scale experiments: SABRE South at the Stawell Underground Physics Laboratory, in Australia, and SABRE North at LNGS. This paper focuses on SABRE South and presents a detailed simulation of the detector, which is used to characterise the background for dark matter searches including DAMA/LIBRA-like modulation. We estimate an overall background of 0.72 cpd/kg/keV$_{ee}$ in the energy range 1$-$6 keV$_{ee}$ primarily due to radioactive contamination in the crystals. Given this level of background and considering that the SABRE South has a target mass of 50 kg, we expect to exclude (confirm) DAMA/LIBRA modulation at $4~(5)σ$ within 2.5 years of data taking.
