Pm

Promethium-159

Protons (Z)

61

Neutrons (N)

98

Mass number

159

Half-Life

1.49 s

Abundance

---

Mass

158.939 u

Mass Excess

-56,554.0 keV

Spin

(5/2-)

Discovered

1998

Binding energy per nucleon

8,127 keV

Neutron separation energy

5,519 keV

Proton separation energy

10,008 keV

Decay Mode

β⁻Samarium-159100%

Decay chain

Promethium-159Z 61 · N 981.49 s
β⁻100%
β⁻100%
β⁻100%
β⁻100%