1. Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan Tel 81-92-642-4140, Fax 81-92-642-3800, sfukada@nucl.kyushu-u.ac.jp
2. Department of Advanced Energy Engineering SciencesKyushu University Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan Tel 81-92-642-4140, Fax 81-92-642-3800, sfukada@nucl.kyushu-u.ac.jp