Cs

Caesium-136m

Protons (Z)

55

Neutrons (N)

81

Mass number

136

Half-Life

17.5 s

Abundance

---

Mass

135.908 u

Mass Excess

-85,821.0 keV

Spin

8-

Discovered

1981

Binding energy per nucleon

8,386 keV

Neutron separation energy

6,310 keV

Proton separation energy

6,697 keV

Decay Mode

Decay chain

Caesium-136Z 55 · N 8117.5 s
γ
β⁻100%