Pm

Promethium-137m

Protons (Z)

61

Neutrons (N)

76

Mass number

137

Half-Life

2.4 m

Abundance

---

Mass

136.921 u

Mass Excess

-73,910.0 keV

Spin

11/2-

Discovered

1973

Binding energy per nucleon

8,262 keV

Neutron separation energy

10,811 keV

Proton separation energy

2,000 keV

Decay Mode

β⁺Neodymium-137100%

Decay chain

Promethium-137Z 61 · N 762.4 m
β⁺100%
β⁺100%
β⁺100%
β⁺100%
EC100%