Abstract: TARGET RESODUES FROM THE INTERACTION OF NATURAL URANIUM TARGET WITH 20 MeV／NUCLEON ~(40)Ar IONSQin Zhi;Li Wenxin;Sun Tongyu;Zhao Lili;Zhang Xiang;Yin Xinming;Wu Dingqing;Zheng Jiwen;Liu Guoxin;Zhao Zhizheng(Institute of Modern Physics，the Chinese Academy of Sciences，Lanzhou 730000)Abstract: The production cross sections of target residues from the interaction of natural uranium with 20 MeV／nucleon~(40)Ar ions have been measured using nuclear chemistry techniques，Charge and mass yield distributions are obtained from these data. It is proved that the process of formation of neutron-excessive nuclides is different from that of neutron-deficient products，The appearance of fusion-like peak corresponding to heavy residues at incident projectile energy of 20 MeV／nucleon is observed.Keywords: Charge distribution Mass yield distribution Nuclear chemistry techniques~(40)Ar ~(238)U