Europium-155 (Eu-155)

Identity

Protons

63

Neutrons

92

Mass number

155

Mass

154.9 ± 1.3 u

Mass excess

-71.818 MeV

Spin

5/2+*

Stability

Half-life: 4.74 years

Natural occurrence

Not found in nature

Decays to

• beta minus → Gd-155