Np

Neptunium-228

Protons (Z)

93

Neutrons (N)

135

Mass number

228

Half-Life

1.02 m

Abundance

---

Mass

228.036 u

Mass Excess

33,830.0 keV

Spin

(4+)

Discovered

1994

Binding energy per nucleon

7,604 keV

Neutron separation energy

6,821 keV

Proton separation energy

2,504 keV

Decay Mode

β⁺SF0.012%

Decay chain

Neptunium-228Z 93 · N 1351.02 m
EC59%
α97.5%
α100%
α100%
α100%
α100%