La
Lanthanum-138
Protons (Z)
57
Neutrons (N)
81
Mass number
138
Half-Life
103.0 Gy
Abundance
0.08881%
Mass
137.907 u
Mass Excess
-86,513.4 keV
Spin
5+
Discovered
1947
Binding energy per nucleon
8,375 keV
Neutron separation energy
7,444 keV
Proton separation energy
6,081 keV
Decay Mode
Decay chain
- LaLanthanum-138Z 57 · N 81103.0 Gy
- β⁺65.5%