Pa
Protactinium-228
Protons (Z)
91
Neutrons (N)
137
Mass number
228
Half-Life
22.0 h
Abundance
---
Mass
228.031 u
Mass Excess
28,924.0 keV
Spin
3+
Discovered
1948
Binding energy per nucleon
7,632 keV
Neutron separation energy
5,977 keV
Proton separation energy
4,170 keV
Decay Mode
Decay chain
- PaProtactinium-228Z 91 · N 13722.0 h
- β⁺98.15%
- α~100%
- α~100%
- α100%
- α100%
- β⁻100%
- β⁻64.046%
- α100%