Pm
Promethium-138m
Protons (Z)
61
Neutrons (N)
77
Mass number
138
Half-Life
10.0 s
Abundance
---
Mass
138.0 u
Mass Excess
0.0 keV
Spin
(1+)
Discovered
---
Binding energy per nucleon
7,725 keV
Neutron separation energy
-66,002 keV
Proton separation energy
-72,295 keV
Decay Mode
- β⁺→Neodymium-138100%
Decay chain
- PmPromethium-138Z 61 · N 7710.0 s
- β⁺100%
- β⁺100%
- β⁺100%