A liquid scintillator for a neutrino detector working at −50 degree
A liquid scintillator for a neutrino detector working at −50 degree
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DOI：
10.1016/j.nima.2021.165459
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Yuguang Xie
中科院分区：
文献类型：
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作者：
Zhangquan Xie;Jun Cao;Yayun Ding;Mengchao Liu;Xilei Sun;Wei Wang;Yuguang Xie
A liquid scintillator (LS) is developed for the Taishan Antineutrino Observatory (TAO), a ton-level neutrino detector to measure the reactor antineutrino spectrum with sub-percent energy resolution by adopting Silicon Photomultipliers (SiPMs) as photosensors. To reduce the dark noise of SiPMs to an acceptable level, the LS has to work at −50 ◦C or lower. A customized apparatus based on a charge-coupled device (CCD) is developed to study the liquid samples’ transparency in a cryostat. We find that the water content in LS results in transparency degradation at low temperatures, which can be cured by bubbling dry nitrogen to remove water. Adding 0.43 g/L ethanol as co-solvent cures the solubility decrease problem of the fluors PPO and bis-MSB at low.temperature. Finally, a Gadolinium-doped liquid scintillator (GdLS), with 0.1% Gd by weight, 2 g/L PPO, 1 mg/L bis-MSB, and 0.43 g/L ethanol in the solvent LAB, shows good transparency at −50 ◦C and also good light yield.
