Abstract: ISOTOPIC DISTRIBUTIONS OF hf FROM THE INTERACTION OF HEAVY IONS WITH~(nat)WZHANG XIANG; Ll WENXIN; YIN XINMN; SUN TONGYU（Institute of Modern Physics,the Chinese Academy of Sciences, Lanzhou 730000）S.AMBE Y. OHKUBO M.IWAMOTO Y. KOBYASHI H. MAEDAF.F.AMBE（Institute of Physical and Chemical Research,Wako,Saitama 351-01，Japan）ABSTRACT The yields of known Hf isotopes prduced in 40MeV／u~(40)Ar，10．5MeV／u~(84)Kr，135MeV／u~(12) C and 80MeV／u~(16)O＋~(nat) W reactions are determined by combining chemical separation proce-dure with γ-ray spectroscopic measurement．The isotopic distributions are obtained. The resultsshow that it is possible to use HIRFL energetic heavy ions to synthesize the neutron-rich isotopesin A ＞ 170 region，and the projectiles with high N／Z ratio value seem to be favourable to the dis-covery of new neutron-rich istopes. However，increasing the projectile energy is not always helpfulto synthesize the new neutron-rich isotopes.Key words Intermediate energy heavy ion γ-ray spectrometry~(nat)W Hf Isotopic distribution.