Pm

Promethium-136m

Protons (Z)

61

Neutrons (N)

75

Mass number

136

Half-Life

1.5 m

Abundance

---

Mass

135.924 u

Mass Excess

-71,070.0 keV

Spin

(2+)

Discovered

1982

Binding energy per nucleon

8,243 keV

Neutron separation energy

9,081 keV

Proton separation energy

2,145 keV

Decay Mode

β⁺Neodymium-136100%

Decay chain

Promethium-136Z 61 · N 751.5 m
β⁺100%
β⁺100%
β⁺100%