Ba

Barium-129

Protons (Z)

56

Neutrons (N)

73

Mass number

129

Half-Life

2.23 h

Abundance

---

Mass

128.909 u

Mass Excess

-85,061.0 keV

Spin

1/2+

Discovered

1950

Binding energy per nucleon

8,391 keV

Neutron separation energy

7,763 keV

Proton separation energy

6,418 keV

Decay Mode

β⁺Caesium-129100%

Decay chain

Barium-129Z 56 · N 732.23 h
β⁺100%
β⁺100%