Abstract: THE STUDY OF NEW NEUTKON-RICH NUCLIDE~185Hf 1．THE SYNTHESIS，SEPARATION AND IDENTIFICATIONZHANG TIANMEI；YUAN SHUANGGUI；ZHANG XUEQIAN；PAN OIANGYAN；XU SHUWEI；CHEN JINGREN~1；LI WEISHENG；YIN XIJIN；DU YIFEI；QI WENKUI；SUN RULIN； WANG YIHAO（Instuute of Modern Physics，Atademia Sinica，Lanzhou，730000）1）（Department of Modern Physics，Lanzhou Universuy，730000）ABSTRACT An unreported Hafnium isotope~185Hf has been identified for first time.Sources of~185Hfprepared by 14 MeV neutron irradiation of tungsten followed by radiochemical separation have been studied． The new activity is identified by following the time variation of the γ-rays. The half-life of~185Hf has been determined to be 3．5±0．6min. In addition，a new 164．5±0．5keV γ-ray is found and assigned to~185Hf based on the rneasurements of transition enertgy and half-life.Key words New nuclide~185Hf Synthesis Separation Identification