e+/e- discrimination in liquid scintillator and its usage to suppress 8He/9Li backgrounds

  • 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 χ2 analysis with an assumption of σ=1 ns PMT Transit Time Spread, which will bring a smearing effect to the PETD.
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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
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 shu
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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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e+/e- discrimination in liquid scintillator and its usage to suppress 8He/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
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 suppress 8He/9Li backgrounds and improves the sensitivity by 0.6 in χ2 analysis with an assumption of σ=1 ns PMT Transit Time Spread, which will bring a smearing effect to the PETD.

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