Ba

Barium-129m

Protons (Z)

56

Neutrons (N)

73

Mass number

129

Half-Life

2.13 h

Abundance

---

Mass

128.909 u

Mass Excess

-85,053.0 keV

Spin

7/2+

Discovered

1950

Binding energy per nucleon

8,391 keV

Neutron separation energy

7,755 keV

Proton separation energy

6,410 keV

Decay Mode

Decay chain

Barium-129Z 56 · N 732.13 h
β⁺100%
β⁺100%