Department of Physics;
Nanjing University;
Nanjing 210008;
Department of Modern Physics;
Lanzhou University;
Lanzhou 730000;
National Laboratory of Heavy Ion Accelerator;
Lanzhou 730000;
Institute of Nuclear Research;
Chinese Academy of Sciences;
Shanghai 201800;
National Laboratory of Solid State Microstructure;
Nanjing University;
Nanjing 210008;