作者单位: | [1]DepartmentofPhysics,JilinUniversity,Changchun130023 [2]InstituteofPhysicsandTandemAcceleratorCenter,UniversityofTsukuba,Ibaraki305,Japan [3]InstituteofModernPhysics,ChineseAcademyofSciences,Lanzhou730000 [4]DepartmentofPhysics,FacultyofScience,HiroshimaUniversity,Hiroshima724,Japan [5]DepartmentofPhysics,FacultyofScience,KyushuUniversity,Fukuoka812,Japan [6]NielsBohrInstitute,TandemAcceleratorLaboratory,RisφDK-4000,Roskilde,Denmark [7]ManneSiegbabnInstituteofPhysics,S-10405Stockholm,Sweden [8]DepartmentofPhysics,UniversityofOslo,Norway |