Sm

Samarium-139

Protons (Z)

62

Neutrons (N)

77

Mass number

139

Half-Life

2.57 m

Abundance

---

Mass

138.922 u

Mass Excess

-72,380.0 keV

Spin

1/2+

Discovered

1971

Binding energy per nucleon

8,243 keV

Neutron separation energy

8,953 keV

Proton separation energy

4,755 keV

Decay Mode

β⁺Promethium-139100%

Decay chain

Samarium-139Z 62 · N 772.57 m
β⁺100%
β⁺100%
β⁺100%
β⁺100%
EC100%