Cs

Caesium-139

Protons (Z)

55

Neutrons (N)

84

Mass number

139

Half-Life

9.27 m

Abundance

---

Mass

138.913 u

Mass Excess

-80,701.0 keV

Spin

7/2+

Discovered

1939

Binding energy per nucleon

8,342 keV

Neutron separation energy

5,885 keV

Proton separation energy

8,018 keV

Decay Mode

β⁻Barium-139100%

Decay chain

Caesium-139Z 55 · N 849.27 m
β⁻100%
β⁻100%