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Cuadro de texto:   -  Atomic Mass: 239.0542878 ± 0.0000021 amu -  Excess Mass: 50568.731 ± 1.992 keV -  Binding Energy: 1806500.907 ± 2.018 keV -  Beta Decay Energy: B- 1263.457 ± 1.472 keV -  Spin: 5/2+ -  Half life: 23.45 min -  Mode of decay: Beta to Np-239 º  Decay energy: 1.265 MeV