La

Lanthanum-129m

Protons (Z)

57

Neutrons (N)

72

Mass number

129

Half-Life

560.0 ms

Abundance

---

Mass

128.913 u

Mass Excess

-81,152.0 keV

Spin

(11/2-)

Discovered

1969

Binding energy per nucleon

8,355 keV

Neutron separation energy

10,593 keV

Proton separation energy

3,072 keV

Decay Mode

γLanthanum-129100%

Decay chain

Lanthanum-129Z 57 · N 72560.0 ms
γ100%
β⁺100%
β⁺100%
β⁺100%