Beijing Radiation Center, Beijing 100875;
Key Laboratory in University for Beam Technology and Materials Modification,Beijing Normal University, Beijing 100875;
Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875 mailing address;
Beijing Radiation Center, Beijing 100875;
Key Laboratory in University for Beam Technology and Materials Modification,Beijing Normal University, Beijing 100875;
Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875 mailing address;
Institut fiir Theoretische Physik I, Ruhr-Universitat Bochum, D-44780 Bochum, Germany;
