Pm

Promethium-137

Protons (Z)

61

Neutrons (N)

76

Mass number

137

Half-Life

2.0 m

Abundance

---

Mass

136.92 u

Mass Excess

-74,073.0 keV

Spin

(5/2-)

Discovered

1975

Binding energy per nucleon

8,264 keV

Neutron separation energy

10,974 keV

Proton separation energy

2,163 keV

Decay Mode

β⁺Neodymium-137

Decay chain

Promethium-137Z 61 · N 762.0 m
β⁺
β⁺100%
β⁺100%
β⁺100%
EC100%