1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, P. R. China
2. Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, Xi'an, 710072, P. R. China
3. Physics Department, Sapienza University of Rome, 00185 Rome, Italy
4. Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, 518063, P. R. China