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用１６Ｏ束轰击１９７Ａｕ靶，通过熔合蒸发４ｎ反应产生了２０９Ｆｒ，借助于氦喷嘴带传输系统对其衰变性质进行了研究．由－ｔ，Ｘ－－ｔ，－－ｔ符合及－延迟符合测量得到的结果，首次建立了２０９Ｆｒ的（ＥＣ＋β＋）衰变纲图．它包含了２０条射线．２０９Ｒｎ的５个低位态的成员可以用［（２１０Ｒｎ２＋）（νｆ５／２）－１］多重态结构来解释．实验估计２０９Ｆｒ（ＥＣ＋β＋）衰变的分支比为（３．０±１．５）％．
197Au targets were bombarded with 16O beams and 209Fr was generated by fusion-evaporated 4n reactions. The decay properties were studied by means of a helium nozzle band transfer system. The (209C) decay scheme of 209Fr was established for the first time from the coincidence of -t, X--t, --t and - delay with the measured results. It contains 20 rays. The five lower members of 209Rn can be explained by the [(210Rn2 +) (νf5 / 2) -1] multiplet structure. The branch ratio of 209Fr (EC + β +) decay experimentally estimated (3.0 ± 1.5)%.