Affiliation: | (College of Physics Science and Technology,Shenyang Normal University,Shenyang 110034,China;School of Physics,Beihang University,Bejjing 100191,China;School of Mathematics and Physics,North China Electric Power University,Beijig 102206,China;Key Laboratory of Beam Technology of Ministry of Education,College of Nuclear Science and Technology,Beijing Normal University,Beijing 100875,China) |