Upgrade of the KamLAND-Zen mini-balloon and future prospects
Upgrade of the KamLAND-Zen mini-balloon and future prospects
复制标题
KamLAND-Zen迷你气球的升级及未来展望
DOI：
10.1016/j.nima.2019.162353
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
for the KamLAND-Zen Collaboration
中科院分区：
文献类型：
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作者：
H.Ozaki,A.Takeuchi;for the KamLAND-Zen Collaboration
KamLAND-Zen是利用含91%~（136）Xe的载氙液体闪烁体（XeLS）进行的无中微子双β（0 ν β β）衰变搜索实验。迷你气球是一个容器，用于将XeLS放置在KamLAND探测器的中心，而不会影响极低的辐射环境。我们安装了一个新的迷你气球，厚度为25 μ m，半径为1.92 m，在1级洁净室中制造，体积几乎是KamLAND-Zen 400迷你气球的两倍。我们在XeLS中安装了约745公斤的氘气，并于2019年1月开始了0 ν β β衰变的搜索。本文还介绍了在大光产额事件（如宇宙射线μ子散射）后收集数据而不丢失的新硬件开发，为KamLAND 2-Zen做准备，这是KamLAND-Zen的未来升级。
KamLAND-Zen is neutrinoless double beta (0 ν β β) decay search experiment with Xe-loaded liquid scintillator (XeLS) containing about 91% enriched 136 Xe. The mini-balloon is a container for holding XeLS at the center of the KamLAND detector without impairing the extremely low radiation environment. We have installed a new mini-balloon with a thickness of 25 μ m and a radius of 1.92 m, which was made in a class 1 clean room and is almost twice the volume of the KamLAND-Zen 400 mini-balloon. We installed about 745 kg of Xe gas in the XeLS and started the 0 ν β β decay search in January 2019. In this paper, novel hardware developments to collect data without loss just after a large light yield event, such as a cosmic ray muon spallation are also introduced in preparation for the KamLAND2-Zen which is a future upgrade of the KamLAND-Zen.