The SNO+ experiment is located 2 km underground at SNOLAB in Sudbury, Canada. A low background search for neutrinoless double beta (0νββ) decay will be conducted using 780 tonnes of liquid scintillator loaded with 3.9 tonnes of natural tellurium, corresponding to 1.3 tonnes of ¹³⁰Te. This paper provides a general overview of the SNO+ experiment, including detector design, construction of process plants, commissioning efforts, electronics upgrades, data acquisition systems, and calibration techniques. The SNO+ collaboration is reusing the acrylic vessel, PMT array, and electronics of the SNO detector, having made a number of experimental upgrades and essential adaptations for use with the liquid scintillator. With low backgrounds and a low energy threshold, the SNO+ collaboration will also pursue a rich physics program beyond the search for 0νββ decay, including studies of geo- and reactor antineutrinos, supernova and solar neutrinos, and exotic physics such as the search for invisible nucleon decay. The SNO+ approach to the search for 0νββ decay is scalable: a future phase with high ¹³⁰Te-loading is envisioned to probe an effective Majorana mass in the inverted mass ordering region.

SNO+ 实验位于加拿大萨德伯里的 SNOLAB 地下 2 公里处。将使用 780 吨装有 3.9 吨天然碲的液体闪烁体，相当于 1.3 吨¹³⁰特。本文概述了 SNO+ 实验，包括检测器设计、过程工厂的建设、调试工作、电子升级、数据采集系统和校准技术。SNO+ 合作正在重复使用 SNO 检测器的丙烯酸容器、PMT 阵列和电子设备，并进行了许多实验升级和必要的调整以与液体闪烁体配合使用。凭借低背景和低能量阈值，SNO+ 合作还将追求丰富的物理项目，超越寻找 0νββ 衰变，包括研究地球和反应堆反中微子、超新星和太阳中微子，以及寻找隐形核子等奇异物理学衰变。搜索 0νββ 衰变的 SNO+ 方法是可扩展的：具有高¹³⁰的未来阶段Te-loading 被设想用于探测反向质量排序区域中的有效马约拉纳质量。