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arXiv · 2012.11883

A liquid scintillator for a neutrino Detector working at -50 degree

Zhangquan Xie·Jun Cao·Yayun Ding·Mengchao Liu·Xilei Sun·Wei Wang·Yuguang Xie
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Abstract

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 photosensor. To reduce the dark noise of SiPMs to an acceptable level, the LS has to work at -50 degree or lower. A customized apparatus based on a charge-coupled device (CCD) is developed to study the transparency of the liquid samples in a cryostat. We find that the water content in LS results in transparency degradation at low temperature, which can be cured by bubbling dry nitrogen to remove water. Adding 0.05% ethanol as co-solvent cures the solubility decrease problem of the fluors PPO and bis-MSB at low temperature. Finally, a Gadoliniumdoped liquid scintillator (GdLS), with 0.1% Gd by weight, 2 g/L PPO, 1 mg/L bis-MSB, and 0.05% ethanol by weight in the solvent LAB, shows good transparency at -50 degree and also good light yield.

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Zhangquan Xie, Jun Cao, Yayun Ding, Mengchao Liu, Xilei Sun, Wei Wang, Yuguang Xie. 2020-12-22. A liquid scintillator for a neutrino Detector working at -50 degree. https://doi.org/10.1016/j.nima.2021.165459

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