1. State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, China
2. Department of Modern Physics, University of Science and Technology of China, Hefei, China
3. Department of Engineering and Applied Physics, University of Science and Technology of China, Hefei, China
4. Key Laboratory of Neutron Physics of China Academy of Engineering Physics, Institute of Nuclear Physics and Chemistry, Mianyang, China