1. Kirin Central Research Institute, Kirin Holdings Company Limited, 26-1 Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555 Japan
2. Frontier Research Center for Applied Atomic Science, Ibaraki University, 162-1 Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1106, Japan
3. Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi,
Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan