Promethium-146 (Pm-146)

Identity

Protons

61

Neutrons

85

Mass number

146

Mass

145.9 ± 4.6 u

Mass excess

-79.454 MeV

Spin

3-

Stability

Half-life: 5.53 years

Natural occurrence

Not found in nature

Decays to

• electron capture 66.0 % → Nd-146
• beta minus 34.0 % → Sm-146