Cs

Caesium-135m

Protons (Z)

55

Neutrons (N)

80

Mass number

135

Half-Life

53.0 m

Abundance

---

Mass

134.908 u

Mass Excess

-85,949.1 keV

Spin

19/2-

Discovered

1962

Binding energy per nucleon

8,389 keV

Neutron separation energy

7,129 keV

Proton separation energy

5,112 keV

Decay Mode

γCaesium-135100%

Decay chain

Caesium-135Z 55 · N 8053.0 m
γ100%
β⁻100%