1. Institute of Modern Physics, Chinese Academy of Sciences, P.O. Box 31, Lanzhou 730000, P. R. China
2. College of Mathematics–Physics and Information, Tianshui Normal University, Gansu, Tianshui 741000, P. R. China
3. Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, P. R. China
4. Science College University of Shanghai for Science and Technology, Shanghai 200093, P. R. China