[1] Japan Atom Energy Agcy, Kansai Photon Sci Inst, 8-1 Umemidai, Kizugawa, Kyoto 6190215, Japan
[2] Kyoto Univ, Inst Adv Energy, Uji, Kyoto 6110011, Japan
[3] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan
[4] Univ Tsukuba, Inst Phys, Tsukuba, Ibaraki 3058571, Japan
[5] Osaka Univ, Res Ctr Nucl Phys, Osaka 5670047, Japan
[6] Chiba Univ, Grad Sch Sci, Dept Phys, Chiba 2638522, Japan