Affiliation: | 1. Department of Physics, Nanjing Normal University, Nanjing 210097, China;2. Department of Physics, Nanjing University, Nanjing 210093, China;3. Joint Center for Particle, Nuclear Physics and Cosmology, Nanjing 210093, China;4. School of Physics and Microelectronics, Shandong University, Jinan 250100, China |