利用能量为 90— 1 0 5MeV的16 O束流 ,通过197Au( 16 O ,4n)反应研究了2 0 9　Fr的高自旋态能级结构 .进行了γ射线的激发函数、γ γ延迟符合及γ射线的角分布测量 .首次建立了由 2 1条γ射线构成的2 0 9Fr的能级纲图 ,其中包括一个半寿命为 ( 52± 2 0 )ns的同质异能态 .基于2 0 9Fr与2 0 8Rn低位能级结构的相似性 ,用一个h9/ 2 价质子与2 0 8Rn激发态的弱耦合解释了2 0 9Fr的低位能级结构 . The high spin state energy structure of 2 0 9 Fr was studied by 197Au (16 O, 4n) reaction using a 16 O beam with an energy of 90-150 MeV. The excitation function of γ-ray, γγ retardation and γ For the first time, an energy level outline of 2 0 9Fr composed of 21 γ-rays has been established, including a isomorphism of half life (52 ± 20) ns.According to 2 0 9Fr Similar to the low level energy structure of 208Rn, the low level energy structure of 209F is explained by the weak coupling between a h9 / 2 valence proton and a 208Rn excited state.