Ba

Barium-139

Protons (Z)

56

Neutrons (N)

83

Mass number

139

Half-Life

1.38 h

Abundance

---

Mass

138.909 u

Mass Excess

-84,913.92 keV

Spin

7/2-

Discovered

1937

Binding energy per nucleon

8,367 keV

Neutron separation energy

4,723 keV

Proton separation energy

9,316 keV

Decay Mode

β⁻Lanthanum-139100%

Decay chain

Barium-139Z 56 · N 831.38 h
β⁻100%