作者机构:[1]College of Science, China University of Mining and Technology, Xuzhou 221008, China, [2]College of Physics and Information Technology, Guangxi Normal University, Guilin 541004, China, [3]China Institute of Atomic Energy, Beijing 102413, China
相关基金:Project supported by the National Natural Science Foundation of China (Grant Nos 10247005 and 70071047) and the Scientific Research Foundation of China University of Mining and Technology for the Young (Grant No 2005A037).