M. Chiba, R. Hamatsu, T. Hirose, T. Matsumoto, J. Yang
Department of Physics, Tokyo Metropolitan University, 1-1 Minami Ohsawa, Hachioji-Shi, Tokyo 192-03, Japan
Activities for measuring electron-positron annihilation at rest into four and five photons are reported. The measurement intends to verify QED at the higher order.