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

Ya-Ping Cheng; Liang-Jian Wen; Peng Zhang; Xing-Zhong Cao

doi:10.1088/1674-1137/41/1/016101

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2024年10月30日

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 suppress ⁸He/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 χ² analysis 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

[1]	B. H. Bransden and Z. Jundi, PROC. PHYS. SOC, 92:880(1967)
[2]	D. Franco, G. Consolati, and D. Trezzi, Phys. Rev. C, 83:015504(2011)
[3]	G. Consolati et al, Phys. Rev. C, 88:065502(2013)
[4]	Z. Djurcic et al (JUNO Collaboration), arXiv:1508. 07166
[5]	F. P. An et al (JUNO Collaboration), J. Phys. G, 43:030401(2016)
[6]	W. Verkerke et al, arXiv:physics/0306116v1
[7]	J. Kansy, Nucl. Instrum. Methods A, 374:235(1996)
[8]	Wenshuai Zhang et al, Computational Materials Science, 105:32(2015)
[9]	J. H. Zou et al, J. Phys. Conf. Ser., 664 (7):072053(2015)
[10]	E. Gatti and F. De Martini, Nuclear Electronics IAEA. Vienna, 2:265-276(1962)
[11]	Hoecker A et al, arXiv:physics/0703039
[12]	P. Vogel and J. F. Beacom, Phys. Rev. D, 60:053003(1999)

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[3]	JIANG Xiao-Pan , ZHANG Zi-Liang , QIN Xiu-Bo , YU Run-Sheng , WANG Bao-Yi . Physical design of positronium time of flight spectroscopy apparatus. Chinese Physics C, 2010, 34(12): 1890-1894.
[4]	WANG Dan-Ni , ZHANG Lan-Zhi , WANG Bao-Yi , YU Run-Sheng , ZHANG Zhi-Ming , LI Dao-Wu , WEI Long . Positronium annihilation in silica aerogel studied by a positron age-momentum correlation technique. Chinese Physics C, 2009, 33(1): 81-84. doi: 10.1088/1674-1137/33/1/017
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[6]	CHENG Zi-Tao , QIAN Qing , FU Yun-Chang , CHEN Xue-Jun . Study of Antihydrogen Atom Formation in Collisions of Antiprotons with Positronium. Chinese Physics C, 1993, 17(5): 448-454.
[7]	Cheng Zitao , Qian Qing , Fu Yunchang , Chen Xuejun . Study of Antihydrogen-Atom Formation in Antiproton-Positronium Collisions. Chinese Physics C, 1993, 17(S2): 171-178.
[8]	ZHANG Tian-Bao , XU Min . TRIPLET TO SINGLET CONVERSION OF POSITRONIUM IN OXYGEN. Chinese Physics C, 1990, 14(4): 289-295.
[9]	Zhang Tianbao , Xu Min . State Conversion of Positronium by Oxygen. Chinese Physics C, 1990, 14(S3): 211-218.
[10]	HE Ming-Ke , RAO Jian-Xi , LIN Da-Hang . THE RELATIVISTIC CORRECTIONS FOR CROUND STATE ENERGY OF THE POSITRONIUM NEGATIVE ION. Chinese Physics C, 1986, 10(2): 146-152.

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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 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

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 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.