Sm

Samarium-139m

Protons (Z)

62

Neutrons (N)

77

Mass number

139

Half-Life

10.7 s

Abundance

---

Mass

138.923 u

Mass Excess

-71,923.0 keV

Spin

11/2-

Discovered

1973

Binding energy per nucleon

8,240 keV

Neutron separation energy

8,496 keV

Proton separation energy

4,298 keV

Decay Mode

Decay chain

Samarium-139Z 62 · N 7710.7 s
γ93.7%
β⁺100%
β⁺100%
β⁺100%
β⁺100%
EC100%