1. Graduate School of Science and Engineering, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki, Japan
2. Tokai Quantum Beam Science Center, National Institutes for Quantum and Radiological Science and Technology (QST), 2-4 Shirakata-Oaza, Tokai, Ibaraki, Japan
3. Atomic Bomb Disease Institute, Nagasaki University, 1-12-4 Sakamoto, Nagasaki, Nagasaki, Japan