La

Lanthanum-126m

Protons (Z)

57

Neutrons (N)

69

Mass number

126

Half-Life

20.0 s

Abundance

---

Mass

125.92 u

Mass Excess

-74,760.0 keV

Spin

(1-)

Discovered

1997

Binding energy per nucleon

8,311 keV

Neutron separation energy

9,072 keV

Proton separation energy

2,380 keV

Decay Mode

β⁺Barium-126100%

Decay chain

Lanthanum-126Z 57 · N 6920.0 s
β⁺100%
β⁺100%
β⁺100%