KamLAND-PICO project aims to search for WIMPs dark matter by means of NaI(Tl) scintillator. To investigate the WIMPs candidate whose cross section is as small as 10−9 pb, a pure NaI(Tl) crystal was developed by chemical processing and taking care of surroundings. The concentration of U and Th chain was reduced to 5.4±0.9 ppt and 3.3±2.2 ppt, respectively. It should be remarked that the concentration of 210Pb which was difficult to reduce reached to the high purity as 58±26μBq/kg.
@article{arxiv.1407.3542,
title = {KamLAND-PICO project to search for cosmic dark matter},
author = {K. Fushimi and Y. Awatani and H. Ejiri and R. Hazama and H. Ikeda and K. Imagawa and K. Inoue and A. Kozlov and R. Orito and T. Shima and R. Sugawaraand K. Yasuda},
journal= {arXiv preprint arXiv:1407.3542},
year = {2016}
}
Comments
6 pages 5 figures, Proceedings of the 26th Workshop on "Radiation Detectors and Their Uses" January 26-28 20214. KEK Tsukuba Japan. Accepted for publication