作者机构:[1]School of Physical Science and Technology, SouthwestUniversity, Chongqing 400715, China, [2]Institute of Modem Physics, Chinese Academy of Sciences,Lanzhou 730000, China, [3]University of Chinese Academy of Sciences, Beijing 100049,China, [4]Cyclotron Institute, Texas A&M University, College Station,TX 77843, USA
相关基金:This work was supported by the Program for the CAS "Light of West China" Program (No. Y601030XB0), the National Basic Research Program of China (No. 2014CB845405) and the National Natural Science Foundation of China (Nos. 11205209 and 11575256).