La
Lanthanum-138m
Protons (Z)
57
Neutrons (N)
81
Mass number
138
Half-Life
116.0 ns
Abundance
---
Mass
137.907 u
Mass Excess
-86,440.8 keV
Spin
(3+)
Discovered
1975
Binding energy per nucleon
8,375 keV
Neutron separation energy
7,371 keV
Proton separation energy
6,008 keV
Decay Mode
- γ→Lanthanum-138100%
Decay chain
- LaLanthanum-138Z 57 · N 81116.0 ns
- γ100%
- β⁺65.5%