Dark matter search with high purity NaI(Tl) scintillator
physics.ins-det
/ Authors
K. Fushimi, Y. Kanemitsu, K. Kotera, D. Chernyak, H. Ejiri, K. Hata, R. Hazama, T. Iida, H. Ikeda, K. Imagawa
and 14 more authors
K. Inoue, H. Ishiura, H. Ito, T. Kisimoto, M. Koga, A. Kozlov, K. Nakamura, R. Orito, T. Shima, Y. Takemoto, S. Umehara, Y. Urano, K. Yasuda, S. Yoshida
/ Abstract
A dark matter search project needs and extremely low background radiation detector since the expected event rate of dark matter is less than a few events in one year in one tonne of the detector mass. The authors developed a highly radiopure NaI(Tl) crystal to search for dark matter. The best combination of the purification methods was developed, resulting $^{\mathrm{nat}}$K and $^{210}$Pb were less than 20 ppb and 5.7 $μ$Bq/kg, respectively. The authors will construct a large volume detector system with high-purity NaI(Tl) crystals. The design and the performance of the prototype detector module will be reported in this article.