Cs

Caesium-123m

Protons (Z)

55

Neutrons (N)

68

Mass number

123

Half-Life

1.64 s

Abundance

---

Mass

122.913 u

Mass Excess

-80,888.0 keV

Spin

11/2-

Discovered

1972

Binding energy per nucleon

8,379 keV

Neutron separation energy

10,819 keV

Proton separation energy

2,822 keV

Decay Mode

γCaesium-123100%

Decay chain

Caesium-123Z 55 · N 681.64 s
γ100%
β⁺100%
β⁺100%
β⁺100%