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ID 112413
著者
江尻, 宏泰 Osaka University
Hazama, R Osaka Sangyo University
Ikeda, H Tohoku University
Imagawa, K I.S.C. Lab.
Inoue, K Tohoku University
Kanzaki, G Tokushima University
Kozlov, A The University of Tokyo
Shima, T Osaka University
Takemoto, Y The University of Tokyo
Teraoka, Y Tohoku University
Umehara, S Osaka University
Yasuda, K I.S.C. Lab.
Yoshida, S Osaka University
資料タイプ
学術雑誌論文
抄録
The PICO-LON project aims at search for cold dark matter by means of highly radio-pure and large volume NaI(Tl) scintillator. The NaI powder was purified by chemical processing to remove lead isotopes and selecting a high purity graphite crucible. The concentrations of radioactive impurities of 226Ra and 228Th were effectively reduced to 58±4 μBq/kg and 1.5±1.9 μBq/kg, respectively. It should be remarked that the concentration of 210Pb, which is crucial for the sensitivity to dark matter, was reduced to 24±2 μBq/kg. The total background rate at 10 keVee was as low as 8 keV-1kg-1day-1, which was sufficiently low to search for dark matter. Further purification of NaI(Tl) ingot and future prospect of PICO-LON project is discussed.
掲載誌名
Journal of Physics: Conference Series
ISSN
17426596
17426588
cat書誌ID
AA12839617
出版者
IOP Publishing
718
開始ページ
042022
発行日
2016-06-09
権利情報
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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言語
eng
著者版フラグ
出版社版
部局
理工学系