Np
Neptunium-242m
Protons (Z)
93
Neutrons (N)
149
Mass number
242
Half-Life
5.5 m
Abundance
---
Mass
242.062 u
Mass Excess
57,470.0 keV
Spin
(6+)
Discovered
1981
Binding energy per nucleon
7,533 keV
Neutron separation energy
4,921 keV
Proton separation energy
6,019 keV
Decay Mode
- β⁻→Plutonium-242100%
Decay chain
- NpNeptunium-242Z 93 · N 1495.5 m
- β⁻100%
- α~100%
- α~100%
- β⁻100%
- β⁻100%
- α~100%
- α~100%
- α~100%
- α100%
- α99.98%
- β⁻100%
- β⁻99.976%
- α100%
- β⁻~100%
- β⁻~100%
- α100%