Pm
Promethium-148m
Protons (Z)
61
Neutrons (N)
87
Mass number
148
Half-Life
41.29 d
Abundance
---
Mass
147.918 u
Mass Excess
-76,728.0 keV
Spin
5-
Discovered
1951
Binding energy per nucleon
8,267 keV
Neutron separation energy
5,757 keV
Proton separation energy
5,870 keV
Decay Mode
Decay chain
- PmPromethium-148Z 61 · N 8741.29 d
- β⁻95.8%
- α100%
- α100%