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Rare event detection is a frontier subject in particle physics and nuclear physics. In particular, dark matter detection, neutrino-free double beta decay and neutrino-nucleon coherent elastic scattering are being planned and implemented gradually. Rare event detection requires not only the detectors to possess excellent performances but also extremely low environmental background, so the selection of detectors and related materials is an important issue in rare event detection. Liquid argon has become an important scintillator material for scintillator detectors because of its low cost, good scintillation performance and large volume. Liquid argon was first studied in the 1940s as a sensitive material for ionizing radiation detectors. The first measurements of high-energy beta particles were obtained by using a liquid argon ionization chamber in 1953. The ICARUS group put forward the idea of constructing liquid argon temporal projection chamber, and made attempt to construct liquid argon temporal projection chamber in 1977. The scintillation light signals were collected for the first time in a liquid argon temporal projection chamber in 1999. Thus, the drift time of the particle can be obtained to determine the particle track. After development, single-phase liquid argon scintillator detector and two-phase argon time projection chamber have become two common types of liquid argon detectors, and have been extensively used in rare event detection experiments in recent years. For dark matter detection, the DEAP group and DarkSide group have achieved good results with single-phase liquid argon scintillation detector and two-phase argon time projection chamber, respectively. For neutrino-free double beta decay experiments, the GERDA group has done a lot of researches of liquid argon anti-coincidence system and applied the said system to experiments. The LEGEND group, which is the combination of GERDA and MAJORANA experimental group, upgraded the liquid argon anti-coincidence system which was applied to the following LEGEND-200 project. For neutrino-nucleon elastic scattering experiments, COHERENT obtained the latest results by using the liquid argon detectors. The Taishan neutrino-nucleon coherent elastic scattering project of the High Energy Institute of Chinese Academy of Sciences has also begun to study the feasibility of liquid argon anti-coincidence system. Finally, this paper discusses the direction of optimizing the liquid argon detector, such as exposure, background level and optical readout scheme, and gives a good prospect of liquid argon detector applied to rare event detection in the future.
[1] Rubin V C, Ford Jr W K 1970 Astrophys. J. 159 379Google Scholar
[2] Furry W H 1939 Phys. Rev. 56 1184Google Scholar
[3] Freedman D Z 1974 Phys. Rev. D 9 1389Google Scholar
[4] Akerib D S, Akerlof C W, Akimov D Y, et al. 2020 Nucl. Instrum. Methods. Phys. Res. , Sect. A 953 163047Google Scholar
[5] Amaudruz P A, Baldwin M, Batygov M, et al. 2019 Astropart. Phys. 108 1Google Scholar
[6] Aalseth C E, Barbeau P S, Bowden N S, et al. 2011 Phys. Rev. Lett. 106 131301Google Scholar
[7] Agnese R, Anderson A J, Aralis T, et al. 2018 Phys. Rev. D 97 022002Google Scholar
[8] Agnes P, Albuquerque I F M, Alexander T, et al. 2018 Phys. Rev. Lett. 121 081307Google Scholar
[9] Agostini M, Araujo G R, Bakalyarov A M, et al. 2020 Phys. Rev. Lett. 125 252502Google Scholar
[10] Akimov D, Albert J B, An P, et al. 2019 Phys. Rev. D 100 115020Google Scholar
[11] Davidson N, Larsh J A E 1948 Phys. Rev. 74 220Google Scholar
[12] Marshall J H 1954 Rev. Sci. Instrum. 25 232Google Scholar
[13] Dolgoshein B A, Lebedenko V N, Rodionov B U 1970 JETP Lett. 11 351
[14] Rubbia C 1977 https://cds.cern.ch/record/117852/files/CERN- EP-INT-77-8/[2022-10-27]
[15] Bvnetti P, Bettini A, Calligarich E, et al. 1993 Nucl. Instrum. Methods. Phys. Res. , Sect. A 332 395Google Scholar
[16] Cennini P, Cittolin S, Revol J P, et al. 1994 Nucl. Instrum. Methods. Phys. Res. , Sect. A 345 230Google Scholar
[17] Kubota S, Hishida M, Nohara A 1978 Nucl. Instrum. Methods 150 561Google Scholar
[18] Cennini P, Revol J P, Rubbia C, et al. 1999 Nucl. Instrum. Methods. Phys. Res. , Sect. A 432 240Google Scholar
[19] Ajaj R, Amaudruz P A, Araujo G R, et al. 2019 Phys. Rev. D 100 022004Google Scholar
[20] Agnes P, Albuquerque I F M, Alexander T, et al. 2018 Phys. Rev. D 98 102006Google Scholar
[21] Suzuki M, Gen J R, Kubota S 1982 Nucl. Instrum. Methods Phys. Res. 192 565Google Scholar
[22] Doke T, Hitachi A, Kikuchi J, Masuda K, Okada H, Shibamura E 2002 Jpn. J. Appl. Phys. 41 1538Google Scholar
[23] Hitachi A, Takahashi T, Funayama N, Masuda K, Kikuchi J, Doke T 1983 Phys. Rev. B 27 5279Google Scholar
[24] Peiffer J P 2007 Ph. D. Dissertation (Heidelberg: Ruperto-Carola University)
[25] Acciarri R, Antonello M, Baibussinov B, et al. 2010 J. Instrum. 5 P06003Google Scholar
[26] Acciarri R, Antonello M, Baibussinov B, et al. 2010 J. Instrum. 5 P05003Google Scholar
[27] Calvo J, Cantini C, Crivelli P, et al. 2018 Astropart. Phys. 97 186Google Scholar
[28] Canci N 2020 J. Instrum. 15 C03026Google Scholar
[29] Zani A 2014 Adv. High. Energy Phys. 2014 1Google Scholar
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[31] Adhikari P, Ajaj R, Alpízar-Venegas M, et al. 2021 Eur. Phys. J. C 81 1Google Scholar
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[33] Benetti P, Acciarri R, Belluco M, et al. 2011 Nucl. Phys. B Proc. Suppl. 221 53Google Scholar
[34] Alexander T, Alton D, Arisaka K, et al. 2013 Astropart. Phys. 49 44Google Scholar
[35] Agnes P, Alexander T, Alton A, et al. 2015 Phys. Lett. B 743 456Google Scholar
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[39] Consiglio L 2020 J. Instrum. 15 C05063Google Scholar
[40] Majorana E 1937 Nuovo Cimento 14 171Google Scholar
[41] Abt I, Altmann M, Bakalyarov A, et al. 2004 arXiv: 0404.039v1 [hep-ex]
[42] Simgen H 2005 Nucl. Phys. B Proc. Suppl. 143 567Google Scholar
[43] Orrell J L, Aalseth C E, Amsbaugh J F, Doe P J, Hossbach T W 2007 Nucl. Instrum. Methods. Phys. Res., Sect. A 579 91Google Scholar
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[45] Agostini M, Barnabé-Heider M, Budjáš D, et al. 2015 Eur. Phys. J. C 75 1Google Scholar
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[47] Agostini M, Allardt M, Bakalyarov A M, et al. 2017 Nature 544 47Google Scholar
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[49] Schwarz M, Krause P, Leonhardt A, et al. 2021 EPJ Web Conf. 253 11014Google Scholar
[50] Efremenko Y, Fajt L, Febbraro M, et al. 2019 J. Instrum. 14 P07006Google Scholar
[51] Wang L, Yue Q, Kang K J, et al. 2017 Sci. Chin. Phys. Mech. 60 1Google Scholar
[52] Wang Z, Yue Q, Kang K J, et al. 2013 Phys. Rev. D 88 052004Google Scholar
[53] Yue Q, Wang Z, Kang K J, et al. 2014 Phys. Rev. D 90 091701Google Scholar
[54] Yang L T, Li H B, Yue Q, et al. 2019 Phys. Rev. Lett. 123 221301Google Scholar
[55] Jiang H, Jia L P, Yue Q, et al. 2018 Phys. Rev. Lett. 120 241301Google Scholar
[56] She Z, Jia L P, Yue Q, et al. 2020 Phys. Rev. Lett. 124 111301Google Scholar
[57] Dai W H, Ma H, Yue Q, et al. 2022 Phys. Rev. D 106 032012Google Scholar
[58] Xiao M J, Xiao X, Zhao L, et al. 2014 Sci. Chin. Phys. Mech. 57 2024Google Scholar
[59] Ni K X, Lai Y H, Abdukerim A, et al. 2019 Chin. Phys. C 43 113001Google Scholar
[60] Cui X, Abdukerim A, Chen W, et al. 2017 Phys. Rev. Lett. 119 181302Google Scholar
[61] Meng Y, Wang Z, Tao Y, et al. 2021 Phys. Rev. Lett. 127 261802Google Scholar
[62] Wang S B 2020 Nucl. Instrum. Methods. Phys. Res., Sect. A 958 162439Google Scholar
[63] Akimov D, Albert J B, An P, et al. 2017 Science 357 1123Google Scholar
[64] Wei Y T, Guan M Y, Liu J C, Yu Z Y, Yang C G, Guo C, Xiong W X, Gan Y Y, Zhao Q, Li J J 2021 Radiat. Detect. Technol. 5 297Google Scholar
[65] Guo C, Guan M Y, Sun X L, Xiong W X, Zhang P, Yang C G, Wei Y T, Gan Y Y, Zhao Q 2020 Nucl. Instrum. Methods. Phys. Res., Sect. A 980 164488Google Scholar
[66] Wang L, Guan M Y, Qin H J, et al. 2021 J. Instrum. 16 P07021Google Scholar
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表 1 稀有事例探测常用探测器类型对比
Table 1. Comparison of detector types in rare event detection.
液态惰性气体探测器 高纯锗探测器 极低温量热器 液氩探测器 液氙探测器 优势 成本低, 有粒子甄别能力,
探测效率高有粒子甄别能力,
探测效率高低阈值, 极高能量分辨率 高能量分辨率,
有粒子甄别能力缺点 能量分辨率相对较低 成本较高, 能量
分辨率相对低成本较高, 探测器生产
工艺复杂, 单个晶体
质量增加困难需要极低温环境
(mK量级)表 2 液氩闪烁光特性[24]
Table 2. Scintillation properties of liquid argon.
闪烁特性相关物理量 符号 数值 光产额/(光子·keV–1) Y 41±2 发光峰值波长/nm λmax 128 单态时间常数/ns τs 6 三重态时间常数/μs τt 1.59 β事件快慢成分比 Is/It (e–) 0.3 α事件快慢成分比 Is/It (α) 1.3 裂变碎片事件快慢成分比 Is/It (ff) 3 表 3 国内外液氩探测器相关实验组概况
Table 3. General situation of liquid argon detector related experimental groups at home and abroad.
实验组
名称稀有事例
探测类型探测器类型 液氩探测
器质量光读出 运行状态 主要特点 DEAP 暗物质 单相液氩闪烁体 3260 kg PMT+光导 运行中 较早采用液氩为介质探测暗物质 WArP 暗物质 两相氩TPC 140 kg PMT 已结束 最早尝试用TPC探测暗物质 DarkSide 暗物质 两相氩TPC 46.4 kg PMT 运行中 地下氩、中子反符合 GERDA 0νββ 高纯锗探测器+单相液氩
闪烁体(反符合)1400 kg SiPM+光
纤/PMT已结束 系统地研究液氩反符合
系统并应用LEGEND 0νββ 高纯锗探测器+单相液氩
闪烁体(反符合)— SiPM+光纤 建设中 实验组合并, 新的读出方案研究 COHERENT CEνNS 单相液氩闪烁体 79.5 kg PMT 运行中 第一个尝试用液氩探测器探测CEνNS事例 Taishan CEνNS 两相氩TPC+单相液氩闪
烁体(反符合)200 kg PMT 建设中 尝试用液氩探测器作为CEνNS
事例的反符合系统表 4 液氩探测器优化和升级
Table 4. Optimization and upgrade of liquid argon detector.
实验组名称 39Ar本底抑制 其它本底抑制 氩纯度监测和稳定 光读出方案升级 DEAP 利用液氩的粒子甄别能力扣除 水切伦科夫探测器抑制μ子 氡捕集阱去除放射性杂质 — DarkSide 地下氩生产技术应用 水切伦科夫探测器抑制μ子, 载硼或载钆液闪抑制中子 同时进行去除电负性
杂质和氩同位素分离SiPM低温稳定读出和紫外
波段直接读出技术研究GERDA — 水切伦科夫探测器抑制μ子, 液氩探测器抑制其他本底 — SiPM+光纤读出 LEGEND 地下氩生成技术研究 水切伦科夫探测器抑制μ子, 液氩探测器抑制其他本底 液氩纯度监测仪 SiPM+光纤双端读出 Taishan 地下氩生产技术研究 塑料闪烁体抑制μ子, 液氩探测器抑制其他本底 — SiPM低温稳定读出技术研究 -
[1] Rubin V C, Ford Jr W K 1970 Astrophys. J. 159 379Google Scholar
[2] Furry W H 1939 Phys. Rev. 56 1184Google Scholar
[3] Freedman D Z 1974 Phys. Rev. D 9 1389Google Scholar
[4] Akerib D S, Akerlof C W, Akimov D Y, et al. 2020 Nucl. Instrum. Methods. Phys. Res. , Sect. A 953 163047Google Scholar
[5] Amaudruz P A, Baldwin M, Batygov M, et al. 2019 Astropart. Phys. 108 1Google Scholar
[6] Aalseth C E, Barbeau P S, Bowden N S, et al. 2011 Phys. Rev. Lett. 106 131301Google Scholar
[7] Agnese R, Anderson A J, Aralis T, et al. 2018 Phys. Rev. D 97 022002Google Scholar
[8] Agnes P, Albuquerque I F M, Alexander T, et al. 2018 Phys. Rev. Lett. 121 081307Google Scholar
[9] Agostini M, Araujo G R, Bakalyarov A M, et al. 2020 Phys. Rev. Lett. 125 252502Google Scholar
[10] Akimov D, Albert J B, An P, et al. 2019 Phys. Rev. D 100 115020Google Scholar
[11] Davidson N, Larsh J A E 1948 Phys. Rev. 74 220Google Scholar
[12] Marshall J H 1954 Rev. Sci. Instrum. 25 232Google Scholar
[13] Dolgoshein B A, Lebedenko V N, Rodionov B U 1970 JETP Lett. 11 351
[14] Rubbia C 1977 https://cds.cern.ch/record/117852/files/CERN- EP-INT-77-8/[2022-10-27]
[15] Bvnetti P, Bettini A, Calligarich E, et al. 1993 Nucl. Instrum. Methods. Phys. Res. , Sect. A 332 395Google Scholar
[16] Cennini P, Cittolin S, Revol J P, et al. 1994 Nucl. Instrum. Methods. Phys. Res. , Sect. A 345 230Google Scholar
[17] Kubota S, Hishida M, Nohara A 1978 Nucl. Instrum. Methods 150 561Google Scholar
[18] Cennini P, Revol J P, Rubbia C, et al. 1999 Nucl. Instrum. Methods. Phys. Res. , Sect. A 432 240Google Scholar
[19] Ajaj R, Amaudruz P A, Araujo G R, et al. 2019 Phys. Rev. D 100 022004Google Scholar
[20] Agnes P, Albuquerque I F M, Alexander T, et al. 2018 Phys. Rev. D 98 102006Google Scholar
[21] Suzuki M, Gen J R, Kubota S 1982 Nucl. Instrum. Methods Phys. Res. 192 565Google Scholar
[22] Doke T, Hitachi A, Kikuchi J, Masuda K, Okada H, Shibamura E 2002 Jpn. J. Appl. Phys. 41 1538Google Scholar
[23] Hitachi A, Takahashi T, Funayama N, Masuda K, Kikuchi J, Doke T 1983 Phys. Rev. B 27 5279Google Scholar
[24] Peiffer J P 2007 Ph. D. Dissertation (Heidelberg: Ruperto-Carola University)
[25] Acciarri R, Antonello M, Baibussinov B, et al. 2010 J. Instrum. 5 P06003Google Scholar
[26] Acciarri R, Antonello M, Baibussinov B, et al. 2010 J. Instrum. 5 P05003Google Scholar
[27] Calvo J, Cantini C, Crivelli P, et al. 2018 Astropart. Phys. 97 186Google Scholar
[28] Canci N 2020 J. Instrum. 15 C03026Google Scholar
[29] Zani A 2014 Adv. High. Energy Phys. 2014 1Google Scholar
[30] Amaudruz P A, Batygov M, Beltran B, et al. 2016 Astropart. Phys. 85 1Google Scholar
[31] Adhikari P, Ajaj R, Alpízar-Venegas M, et al. 2021 Eur. Phys. J. C 81 1Google Scholar
[32] Adhikari P, Ajaj R, Alpizar-Venegas M, et al. 2022 Phys. Rev. Lett. 128 011801Google Scholar
[33] Benetti P, Acciarri R, Belluco M, et al. 2011 Nucl. Phys. B Proc. Suppl. 221 53Google Scholar
[34] Alexander T, Alton D, Arisaka K, et al. 2013 Astropart. Phys. 49 44Google Scholar
[35] Agnes P, Alexander T, Alton A, et al. 2015 Phys. Lett. B 743 456Google Scholar
[36] Aalseth C E, Acerbi F, Agnes P, et al. 2018 Eur. Phys. J. Plus 133 1Google Scholar
[37] Rossi M 2021 Nuovo Cimento 44 1Google Scholar
[38] Carnesecchi F 2020 J. Instrum. 15 C03038Google Scholar
[39] Consiglio L 2020 J. Instrum. 15 C05063Google Scholar
[40] Majorana E 1937 Nuovo Cimento 14 171Google Scholar
[41] Abt I, Altmann M, Bakalyarov A, et al. 2004 arXiv: 0404.039v1 [hep-ex]
[42] Simgen H 2005 Nucl. Phys. B Proc. Suppl. 143 567Google Scholar
[43] Orrell J L, Aalseth C E, Amsbaugh J F, Doe P J, Hossbach T W 2007 Nucl. Instrum. Methods. Phys. Res., Sect. A 579 91Google Scholar
[44] Heider M B 2009 Ph. D. Dissertation (Heidelberg: Ruperto-Carola University)
[45] Agostini M, Barnabé-Heider M, Budjáš D, et al. 2015 Eur. Phys. J. C 75 1Google Scholar
[46] Agostini M, Bakalyarov A M, Balata M, et al. 2018 Eur. Phys. J. C 78 1Google Scholar
[47] Agostini M, Allardt M, Bakalyarov A M, et al. 2017 Nature 544 47Google Scholar
[48] Hoppe E W, Aalseth C E, Farmer O T, Hossbach T W, Liezers M, Miley H S, Overman N R, Reeves J H 2014 Nucl. Instrum. Methods. Phys. Res., Sect. A 764 116Google Scholar
[49] Schwarz M, Krause P, Leonhardt A, et al. 2021 EPJ Web Conf. 253 11014Google Scholar
[50] Efremenko Y, Fajt L, Febbraro M, et al. 2019 J. Instrum. 14 P07006Google Scholar
[51] Wang L, Yue Q, Kang K J, et al. 2017 Sci. Chin. Phys. Mech. 60 1Google Scholar
[52] Wang Z, Yue Q, Kang K J, et al. 2013 Phys. Rev. D 88 052004Google Scholar
[53] Yue Q, Wang Z, Kang K J, et al. 2014 Phys. Rev. D 90 091701Google Scholar
[54] Yang L T, Li H B, Yue Q, et al. 2019 Phys. Rev. Lett. 123 221301Google Scholar
[55] Jiang H, Jia L P, Yue Q, et al. 2018 Phys. Rev. Lett. 120 241301Google Scholar
[56] She Z, Jia L P, Yue Q, et al. 2020 Phys. Rev. Lett. 124 111301Google Scholar
[57] Dai W H, Ma H, Yue Q, et al. 2022 Phys. Rev. D 106 032012Google Scholar
[58] Xiao M J, Xiao X, Zhao L, et al. 2014 Sci. Chin. Phys. Mech. 57 2024Google Scholar
[59] Ni K X, Lai Y H, Abdukerim A, et al. 2019 Chin. Phys. C 43 113001Google Scholar
[60] Cui X, Abdukerim A, Chen W, et al. 2017 Phys. Rev. Lett. 119 181302Google Scholar
[61] Meng Y, Wang Z, Tao Y, et al. 2021 Phys. Rev. Lett. 127 261802Google Scholar
[62] Wang S B 2020 Nucl. Instrum. Methods. Phys. Res., Sect. A 958 162439Google Scholar
[63] Akimov D, Albert J B, An P, et al. 2017 Science 357 1123Google Scholar
[64] Wei Y T, Guan M Y, Liu J C, Yu Z Y, Yang C G, Guo C, Xiong W X, Gan Y Y, Zhao Q, Li J J 2021 Radiat. Detect. Technol. 5 297Google Scholar
[65] Guo C, Guan M Y, Sun X L, Xiong W X, Zhang P, Yang C G, Wei Y T, Gan Y Y, Zhao Q 2020 Nucl. Instrum. Methods. Phys. Res., Sect. A 980 164488Google Scholar
[66] Wang L, Guan M Y, Qin H J, et al. 2021 J. Instrum. 16 P07021Google Scholar
[67] Adams D Q, Alduino C, Alfonso K, et al. 2022 Nature 604 53Google Scholar
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