Affiliation: | a Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Fukuoka-shi 819-0395, Japan b Taiyo Nippon Sanso Corporation, 1-3-26 Koyama, Shinagawa-ku 142-8558, Japan c Japan Atomic Energy Agency, 4-33 Muramatsu, Tokai-mura, Naka-gun, Ibaraki-ken 319-1194, Japan d SII NanoTechnology Inc., 36-1 Takenoshita, Oyama-cho, Suntou-gun, Shizuoka-ken 410-1393, Japan |