Pm

Promethium-140m

Protons (Z)

61

Neutrons (N)

79

Mass number

140

Half-Life

5.95 m

Abundance

---

Mass

139.916 u

Mass Excess

-77,783.0 keV

Spin

8-

Discovered

1966

Binding energy per nucleon

8,286 keV

Neutron separation energy

8,353 keV

Proton separation energy

3,055 keV

Decay Mode

β⁺Neodymium-140100%

Decay chain

Promethium-140Z 61 · N 795.95 m
β⁺100%
EC100%
β⁺100%