Lanthanum-137 (La-137)
Identity
- Protons
- 57
- Neutrons
- 80
- Mass number
- 137
- Mass
- 136.9 ± 1.8 u
- Mass excess
- -87.141 MeV
- Spin
- 7/2+*
Stability
Half-life: 6.00 × 10⁴ years
Natural occurrence
Not found in nature
Decays to
- electron capture Ba-137
Half-life: 6.00 × 10⁴ years
Not found in nature