La
Lanthanum-139m
Protons (Z)
57
Neutrons (N)
82
Mass number
139
Half-Life
315.0 ns
Abundance
---
Mass
138.908 u
Mass Excess
-85,422.0 keV
Spin
(17/2+)
Discovered
2012
Binding energy per nucleon
8,365 keV
Neutron separation energy
6,980 keV
Proton separation energy
4,449 keV
Decay Mode
- γ→Lanthanum-139100%
Decay chain
- LaLanthanum-139Z 57 · N 82315.0 ns
- γ100%