Eu
Europium-139
Protons (Z)
63
Neutrons (N)
76
Mass number
139
Half-Life
17.9 s
Abundance
---
Mass
138.93 u
Mass Excess
-65,398.0 keV
Spin
(11/2-)
Discovered
1975
Binding energy per nucleon
8,187 keV
Neutron separation energy
11,719 keV
Proton separation energy
1,189 keV
Decay Mode
- β⁺→Samarium-139100%
Decay chain
- EuEuropium-139Z 63 · N 7617.9 s
- β⁺100%
- β⁺100%
- β⁺100%
- β⁺100%
- β⁺100%
- EC100%