Spectroscopic performance improvement of SOI pixel detector for X-ray astronomy by introducing Double-SOI structure. (1st November 2020) - Takeda, A.; Mori, K.; Nishioka, Y.; Fukuda, K.; Yukumoto, M.; Hida, T.; Tsuru, T.G.; Tanaka, T.; Uchida, H.; Hayashi, H.; Harada, S.; Okuno, T.; et al.