Dark matter search project PICO-LON

• Fushimi, Ken-Ichi

• Ejiri, Hiroyasu

• Hazama, R

• Ikeda, H

• Imagawa, K

• Inoue, K

• Kanzaki, G

• Kozlov, A

• Orito, Reiko

• Shima, T

• Takemoto, Y

• Teraoka, Y

• Umehara, S

• Yasuda, K

• Yoshida, S

Abstract

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.

Journal

• Journal of Physics: Conference Series

  Journal of Physics: Conference Series 718 042022-, 2016-06-09

  IOP Publishing

Keywords

• Computer Science Applications
• History
• Education

Details

• CRID: 1050564287715432704
• NII Article ID: 120006535041
• NII Book ID: AA12839617
• ISSN: 17426596
• ISSN: 17426588
• DOI: 10.1088/1742-6596/718/4/042022
• Web Site: https://repo.lib.tokushima-u.ac.jp/112413
• Web Site: http://stacks.iop.org/1742-6596/718/i=4/a=042022/pdf
• Web Site: http://stacks.iop.org/1742-6596/718/i=4/a=042022?key=crossref.ddf2908f4a8262e928dfd1aa82060897
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN