1. Musashi Imtitute of Technology Atomic Energy Research Laboratory Oozenji, Kawasaki-ski, Kanagawa, 215, Japan
2. Kyoto University, Research Reactor Institute Kumatori-cho, Sennan-gun, Oosaka, 590-04, Japan
3. Musashi Institute of Technology, A tomic Energy Research Laboratory Oozenji, Kawasaki-ski, Kanagawa, 215, Japan