PICOLON dark matter search project
K. Fushimi, D. Chernyak, H. Ejiri, K. Hata, R. Hazama, T. Iida, H., Ikeda, K. Imagawa, K. Inoue, H. Ishiura, H. Ito, T. Kishimoto, M. Koga, K., Kotera, A. Kozlov, K. Nakamura, R. Orito, T. Shima, Y. Takemoto, S. Umehara,, Y. Urano, Y. Yamamoto, K. Yasuda, and S. Yoshida
TL;DR
PICOLON is a project using ultra-pure NaI(Tl) crystals to detect cosmic dark matter, focusing on low-background measurements and potential annual modulation signals in underground experiments.
Contribution
The development of highly pure NaI(Tl) crystals via hybrid purification and initial low-background testing at Kamioka Underground Laboratory.
Findings
$^{210}$Pb contamination less than 5.7 μBq/kg
Successful low-background measurement setup at Kamioka
Discussion on sensitivity to dark matter signals
Abstract
PICOLON (Pure Inorganic Crystal Observatory for LOw-energy Neutr(al)ino) aims to search for cosmic dark matter by high purity NaI(Tl) scintillator. We developed extremely pure NaI(Tl) crystal by hybrid purification method. The recent result of Pb in our NaI(Tl) is less than 5.7 Bq/kg. We will report the test experiment in the low-background measurement at Kamioka Underground Laboratory. The sensitivity for annual modulating signals and finding dark matter particles will be discussed.
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