He
Helium-9
Protons (Z)
2
Neutrons (N)
7
Mass number
9
Half-Life
2.5 zs
Abundance
---
Mass
9.044 u
Mass Excess
40,940.0 keV
Spin
(1/2+)
Discovered
1987
Binding energy per nucleon
3,349 keV
Neutron separation energy
-1,259 keV
Proton separation energy
---
Decay Mode
- n→Helium-8100%
Decay chain
- HeHelium-9Z 2 · N 72.5 zs
- n100%
- β⁻83.1%
- β⁻α100%