Pm
Promethium-157
Protons (Z)
61
Neutrons (N)
96
Mass number
157
Half-Life
10.56 s
Abundance
---
Mass
156.933 u
Mass Excess
-62,297.0 keV
Spin
(5/2-)
Discovered
1987
Binding energy per nucleon
8,164 keV
Neutron separation energy
6,202 keV
Proton separation energy
9,384 keV
Decay Mode
- β⁻→Samarium-157100%
Decay chain
- PmPromethium-157Z 61 · N 9610.56 s
- β⁻100%
- β⁻100%
- β⁻100%