Promethium-148 (Pm-148)

Identity

Protons

61

Neutrons

87

Mass number

148

Mass

147.9 ± 6.1 u

Mass excess

-76.866 MeV

Spin

1-*

Stability

Half-life: 5.37 days

Natural occurrence

Not found in nature

Decays to

• beta minus → Sm-148