Institution: | LI FA-SHEN YANG CHUN-LI(Department of Physics, Lanzhou University,Lanzhou 730000, PRC)ZHONG WEN-DING(Department of Physics, Peking University, Beijing 100871, PRC)H. M ICKLITZ M.M. ABD-ELMEGUID(Institutfür Experimental-physik Ⅳ. Ruhr Universitt Bochum, D-4630 Bochum, Germany) |