Eu

Europium-138m

Protons (Z)

63

Neutrons (N)

75

Mass number

138

Half-Life

12.1 s

Abundance

---

Mass

137.934 u

Mass Excess

-61,650.0 keV

Spin

(7-)

Discovered

1982

Binding energy per nucleon

8,161 keV

Neutron separation energy

9,575 keV

Proton separation energy

947 keV

Decay Mode

β⁺Samarium-138100%

Decay chain

Europium-138Z 63 · N 7512.1 s
β⁺100%
β⁺100%
β⁺100%
β⁺100%
β⁺100%