La

Lanthanum-123

Protons (Z)

57

Neutrons (N)

66

Mass number

123

Half-Life

17.0 s

Abundance

---

Mass

122.926 u

Mass Excess

-68,650.0 keV

Spin

(11/2-)

Discovered

1978

Binding energy per nucleon

8,267 keV

Neutron separation energy

12,181 keV

Proton separation energy

1,330 keV

Decay Mode

β⁺Barium-123100%

Decay chain

Lanthanum-123Z 57 · N 6617.0 s
β⁺100%
β⁺100%
β⁺100%
β⁺100%
β⁺100%