Np
Neptunium-238
Protons (Z)
93
Neutrons (N)
145
Mass number
238
Half-Life
2.1 d
Abundance
---
Mass
238.051 u
Mass Excess
47,454.6 keV
Spin
2+
Discovered
1949
Binding energy per nucleon
7,566 keV
Neutron separation energy
5,488 keV
Proton separation energy
5,224 keV
Decay Mode
- β⁻→Plutonium-238100%
Decay chain
- NpNeptunium-238Z 93 · N 1452.1 d
- β⁻100%
- α~100%
- α~100%
- α~100%
- α~100%
- α100%
- α99.98%
- β⁻100%
- β⁻99.976%
- α100%
- β⁻~100%
- β⁻~100%
- α100%