Measurement of the radon concentration in purified water in the Super-Kamiokande IV detector

被引：18

作者：

Nakano, Y. ^{[1
]}

Hokama, T. ^{[2
]}

Matsubara, M. ^{[3
]}

Miwa, M. ^{[4
]}

Nakahata, M. ^{[5
,6
]}

Nakamura, T. ^{[7
]}

Sekiya, H. ^{[5
,6
]}

Takeuchi, Y. ^{[1
,6
]}

Tasaka, S. ^{[5
]}

Wendell, R. A. ^{[6
,8
]}

机构：

[1] Kobe Univ, Grad Sch Sci, Dept Phys, Kobe, Hyogo 6578501, Japan

[2] Japan Atom Energy Agcy, Nucl Emergency Assistance & Training Ctr, Ibaraki 3111206, Japan

[3] Gifu Univ, Head Off Informat & Management, Gifu 5011193, Japan

[4] Gifu Univ, Life Sci Res Ctr, Div Radioisotope Expt, Gifu 5011193, Japan

[5] Univ Tokyo, Inst Cosm Ray Res, Kamioka Observ, Gifu 5061205, Japan

[6] Univ Tokyo, Inst Adv Study, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan

[7] Gifu Univ, Fac Educ, Dept Phys, Gifu 5011193, Japan

[8] Kyoto Univ, Dept Phys, Kyoto, Kyoto 6068502, Japan

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2020年 / 977卷

关键词：

Super-Kamiokande; Radon; Solar neutrino; Charcoal; Radon extraction column; SYSTEM; RN-222; ADSORPTION; NEUTRINOS; OSCILLATIONS; CALIBRATION; MATTER; GAS;

D O I：

10.1016/j.nima.2020.164297

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The radioactive noble gas radon can be a serious background source in the underground particle physics experiments studying processes that deposit energy comparable to its decay products. Low energy solar neutrino measurements at Super-Kamiokande suffer from these backgrounds and therefore require precise characterization of the radon concentration in the detector's ultra-pure water. For this purpose, we have developed a measurement system consisting of a radon extraction column, a charcoal trap, and a radon detector. In this article we discuss the design, calibration, and performance of the radon extraction column. We also describe the design of the measurement system and evaluate its performance, including its background. Using this system we measured the radon concentration in Super-Kamiokande's water between May 2014 and October 2015. The measured radon concentration in the supply lines of the water circulation system was 1.74 +/- 0.14 mBq/m(3) and in the return line was 9.06 +/- 0.58 mBq/m(3). Water sampled from the center region of the detector itself had a concentration of < 0.23 mBq/m(3) (95% C.L.) and water sampled from the bottom region of the detector had a concentration of 2.63 +/- 0.22 mBq/m(3).

引用

页数：11

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