Pm
Promethium-156m
Protons (Z)
61
Neutrons (N)
95
Mass number
156
Half-Life
2.3 s
Abundance
---
Mass
155.931 u
Mass Excess
-64,016.5 keV
Spin
(1+)
Discovered
2007
Binding energy per nucleon
8,176 keV
Neutron separation energy
5,148 keV
Proton separation energy
9,021 keV
Decay Mode
Decay chain
- PmPromethium-156Z 61 · N 952.3 s
- γ98%
- β⁻100%
- β⁻100%
- β⁻100%