1. High Energy Accelerator Research Organization, Tsukuba, 305-0801, JapanTel.: , Fax:
2. Institute of Chemical Physics, Russian Academy of Sciences, Kosygin, Moscow, 117334, Russia
3. RCNT, University of Tokyo, JAERI, Tokai-Mura, Ibaraki, 319-1106, Japan
4. Nara Woman's University, Dept. of Life Science, Nara, 630-8506, Japan