Pm

Promethium-159m

Protons (Z)

61

Neutrons (N)

98

Mass number

159

Half-Life

4.42 µs

Abundance

---

Mass

158.941 u

Mass Excess

-55,089.0 keV

Spin

(17/2+)

Discovered

2015

Binding energy per nucleon

8,118 keV

Neutron separation energy

4,054 keV

Proton separation energy

8,543 keV

Decay Mode

γPromethium-159100%

Decay chain

Promethium-159Z 61 · N 984.42 µs
γ100%
β⁻100%
β⁻100%
β⁻100%
β⁻100%