Chinese Physics C > 2017, Vol. 41 > Issue(1): 016101 DOI: 10.1088/1674-1137/41/1/016101

e⁺/e^-discrimination in liquid scintillator and its usage to suppress⁸He/⁹Li backgrounds

1.
University of Chinese Academy of Sciences, Beijing 100049, China
2.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
3.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

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Abstract：
Reactor neutrino experiments build large-scale detector systems to detect neutrinos. In liquid scintillator, a neutral bound state of a positron and an electron, named positronium, can be formed. The spin triplet state is called ortho-positronium (o-Ps). In this article, an experiment is designed to measure the lifetime of o-Ps, giving a result of 3.1 ns. A PSD parameter based on photon emission time distribution (PETD) was constructed to discriminate e ⁺/e ^-. Finally, the application of e ⁺/e ^-discrimination in the JUNO experiment is shown. It helps suppress ⁸He/ ⁹Li backgrounds and improves the sensitivity by 0.6 in χ ²analysis with an assumption of σ=1 ns PMT Transit Time Spread, which will bring a smearing effect to the PETD.
- PSD,
- LS,
- ortho-positronium

References

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Ya-Ping Cheng, Liang-Jian Wen, Peng Zhang and Xing-Zhong Cao. e ⁺/e ^-discrimination in liquid scintillator and its usage to suppress ⁸He/ ⁹Li backgrounds[J]. Chinese Physics C, 2017, 41(1): 016101. doi: 10.1088/1674-1137/41/1/016101

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Received: 2016-04-15
Revised: 2016-07-27

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Supported by National Natural Science Foundation of China (11575226, 11475197, 11205183)

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

e⁺/e^-discrimination in liquid scintillator and its usage to suppress⁸He/⁹Li backgrounds

Corresponding author:Ya-Ping Cheng,

Corresponding author:Liang-Jian Wen,

1. University of Chinese Academy of Sciences, Beijing 100049, China
2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
3. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Received Date:2016-04-15
Accepted Date:2016-07-27
Available Online:2017-01-05

Fund Project:Supported by National Natural Science Foundation of China (11575226, 11475197, 11205183)

Abstract:Reactor neutrino experiments build large-scale detector systems to detect neutrinos. In liquid scintillator, a neutral bound state of a positron and an electron, named positronium, can be formed. The spin triplet state is called ortho-positronium (o-Ps). In this article, an experiment is designed to measure the lifetime of o-Ps, giving a result of 3.1 ns. A PSD parameter based on photon emission time distribution (PETD) was constructed to discriminate e⁺/e^-. Finally, the application of e⁺/e^-discrimination in the JUNO experiment is shown. It helps suppress⁸He/⁹Li backgrounds and improves the sensitivity by 0.6 inχ²analysis with an assumption ofσ=1 ns PMT Transit Time Spread, which will bring a smearing effect to the PETD.