Eu

Europium-139m

Protons (Z)

63

Neutrons (N)

76

Mass number

139

Half-Life

10.0 µs

Abundance

---

Mass

138.93 u

Mass Excess

-65,250.0 keV

Spin

(7/2+)

Discovered

2011

Binding energy per nucleon

8,186 keV

Neutron separation energy

11,571 keV

Proton separation energy

1,041 keV

Decay Mode

γEuropium-139100%

Decay chain

Europium-139Z 63 · N 7610.0 µs
γ100%
β⁺100%
β⁺100%
β⁺100%
β⁺100%
β⁺100%
EC100%