1. Key Laboratory of Nuclear Data, China Institute of Atomic Energy, Beijing 102413, P. R. China
2. College of Physics and Electronic Science, Shanxi Datong University, Datong 037009, P. R. China
3. Guangxi Key Laboratory of Nuclear, Physics and Nuclear Technology, Guangxi Normal University, Guilin 541004, P. R. China
4. College of Physics, Guangxi Normal University, Guilin 541004, P. R. China
5. Department of Physics, Nankai University, Tianjin 300071, P. R. China