Abstract: STUDY OF NEW HEAVY NEUTRONRICH NUCLIDE 237ThZhang Tianmei Li Zongwei Yuan Shuanggui Xu ShuweiPan Qiangyan Zhang Xueqian Wang Yihao(Institute of Modern Physics,the Chinese Academy of Sciences,Lanzhou 730000)ABSTRACTA new heavy neutronrich isotope,237Th,has been synthesized and identified for the first time by the (n,2p) reaction and rapid chemical separation method according to the relation of motherdaughter decay;its halflive is (50±09) min.A rapid chemical separation procedure of trace thorium has been finished from a great deal of uranium and interfere fission products,and is successfully used to the synthesis and identification of a new heavy neutronrich nuclide,237Th.Key words 237Th New heavy neutronrich nuclide Solvent extraction Separation Identification