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<p>The central detector of the Jiangmen Underground Neutrino Observatory (JUNO) is filled with 20,000 tons of high-purity liquid scintillator (LS) and is engineered for an operational lifespan exceeding 20 years. Trace oxygen dissolved in the LS is a critical parameter that impacts both the scintillation light yield and the long-term chemical stability of the detector. In this study, we determined the Henry’s law constant for oxygen in JUNO LS using a multi-point fitting method at constant temperature and pressure. The result indicates that oxygen solubility in the LS is approximately eightfold greater than that in water. Building on this finding, we monitored oxygen levels across various stages of the JUNO LS production process. Results demonstrate that the oxygen content in the Linear Alkyl Benzene (LAB) within the 5000-cubic-meter raw material tank decreases slightly after alumina filtration and distillation, followed by a minor increase during mixing and water extraction. Nitrogen stripping ultimately reduces the oxygen concentration to below the instrumental detection limit. Furthermore, the measured oxygen content facilitated an indirect assessment of radon (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(^{222}\text {Rn}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mmultiscripts> <mrow /> <mrow /> <mn>222</mn> </mmultiscripts> <mtext>Rn</mtext> </mrow> </math></EquationSource> </InlineEquation>) concentrations and enabled an evaluation of the antioxidant 2,6-Di-tert-butyl-4-methylphenol (BHT) in safeguarding long-term LS chemical stability.</p>

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Measurement of the oxygen content in the liquid scintillator of JUNO

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Weixi Zhang,
  • Tao Liu,
  • Xilei Sun,
  • Guoping Zuo,
  • Boxiang Yu,
  • Jian Fang,
  • Li Zhou,
  • Lijun Sun,
  • Tao Hu,
  • Wanjin Liu,
  • Xiao Cai,
  • Yayun Ding,
  • Yuguang Xie,
  • Xin Ling,
  • Wenjie Li,
  • Aiqin Gao,
  • Hao Wei,
  • Hengyu Wang,
  • Junyu Shao,
  • Lei Cao,
  • Min Ouyang,
  • Mingzheng Yang,
  • Wenjie Zhang,
  • Xinlian Wu

摘要

The central detector of the Jiangmen Underground Neutrino Observatory (JUNO) is filled with 20,000 tons of high-purity liquid scintillator (LS) and is engineered for an operational lifespan exceeding 20 years. Trace oxygen dissolved in the LS is a critical parameter that impacts both the scintillation light yield and the long-term chemical stability of the detector. In this study, we determined the Henry’s law constant for oxygen in JUNO LS using a multi-point fitting method at constant temperature and pressure. The result indicates that oxygen solubility in the LS is approximately eightfold greater than that in water. Building on this finding, we monitored oxygen levels across various stages of the JUNO LS production process. Results demonstrate that the oxygen content in the Linear Alkyl Benzene (LAB) within the 5000-cubic-meter raw material tank decreases slightly after alumina filtration and distillation, followed by a minor increase during mixing and water extraction. Nitrogen stripping ultimately reduces the oxygen concentration to below the instrumental detection limit. Furthermore, the measured oxygen content facilitated an indirect assessment of radon ( \(^{222}\text {Rn}\) 222 Rn ) concentrations and enabled an evaluation of the antioxidant 2,6-Di-tert-butyl-4-methylphenol (BHT) in safeguarding long-term LS chemical stability.