作者单位: | 中国科学院上海原子核研究所 上海 201800;1 The Institute of Physical and Chemical Research,RIKEN,Wako,Saitama 351-01,Japan;2 Department of Physics,Tokyo Institute of Technologe,Meguro,Toyko 152,Japan;3 Institute of Physics,University of Tsukuba,Tsukuba,Ibaraki 305,Japan;4 Laboratory of Nuclear Science,Tohoku University,Sendai,Miyagi 982,Japan |