Pm
Promethium-128
Protons (Z)
61
Neutrons (N)
67
Mass number
128
Half-Life
1.0 s
Abundance
---
Mass
127.948 u
Mass Excess
-48,220.0 keV
Spin
(4+)
Discovered
1999
Binding energy per nucleon
8,075 keV
Neutron separation energy
10,981 keV
Proton separation energy
-401 keV
Decay Mode
Decay chain
- PmPromethium-128Z 61 · N 671.0 s
- β⁺100%
- β⁺
- β⁺100%
- β⁺100%
- β⁺100%
- EC100%
- β⁺100%