以５０ＭｅＶ／ｕ丰中子炮弹１８Ｏ轰击天然铀靶，通过奇异的多核于转移反应产生了２３９Ｐａ，用放射化学分离方法从复杂的反应产物中分离出Ｐａ活性，借助于２３９Ｐａ及其子体２３９Ｕ衰变的观察，鉴别了新重丰中子核素２３９Ｐａ，并测定其半衰期为１０６±３０ｍｉｎ．同时，还发现了能量为５２２．０、５６２．０、６３８．５、６８１．０ｋｅＶ的２３９Ｐａ的四条衰变γ射线。 The natural uranium target was bombarded with 50 MeV / u abundance neutron cannonball 18O and produced 239 Pa through a singular multinuclear transfer reaction. The Pa activity was separated from the complex reaction product by a radiochemical separation method. With 239 Pa and 239U decay Observed the new heavy Fung neutron nuclide 239Pa, and measured half-life of 106 ± 30min. At the same time, four decay gamma rays of 239Pa with energies of 522.0, 562.0, 638.5 and 681.0 keV were also found.