Affiliation: | GAN Sheng-Xin1,2 ZUO Wei1,2 U.Lombardo31 Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China3 Department of Physics and Astrophysics,Catania University,Via Santa Sofia 64,I-95123,and INFN-LNS,Via Santa Sofia 44,I-95123 Catania,Italy |