Development of low-background photomultiplier tubes for liquid xenon detectors. (1st September 2020) - Abe, K.; Chen, Y.; Hiraide, K.; Ichimura, K.; Imaizumi, S.; Kato, N.; Kishimoto, Y.; Kobayashi, K.; Kobayashi, M.; Moriyama, S.; Nakahata, M.; Sato, K.; et al.