School of Physics and Engineering and Henan Key Laboratory of Ion Beam Bioengineering Zhengzhou University Zhengzhou 450001 China;
School of Information Science and Engineering Ningbo Institute of Technology Zhejiang University Ningbo 315100 China;
CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China;
School of Physics and Nuclear Energy Engineering Beihang University Beijing 100191 China;
Physics Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831-6354 USA;
