Gd
Gadolinium-139m
Protons (Z)
64
Neutrons (N)
75
Mass number
139
Half-Life
4.8 s
Abundance
---
Mass
138.938 u
Mass Excess
-57,380.0 keV
Spin
(1/2+)
Discovered
1983
Binding energy per nucleon
8,124 keV
Neutron separation energy
9,791 keV
Proton separation energy
2,919 keV
Decay Mode
Decay chain
- GdGadolinium-139Z 64 · N 754.8 s
- β⁺100%
- β⁺100%
- β⁺100%
- β⁺100%
- β⁺100%
- β⁺100%
- EC100%