1. Institute of Atomic and Molecular Physics
2. Sichuan University
3. Chengdu 610065
4. People's Republic of China
5. College of Optoelectronic Technology
6. Chengdu University of Information Technology
7. Chengdu 610225
8. China
9. Institute of Nuclear Physics and Chemistry
10. China Academy of Engineering Physics
11. Mianyang 621900
12. Department of Physics
13. Key Laboratory for Radiation Physics & Technology of Ministry of Education