Cs

Caesium-117m

Protons (Z)

55

Neutrons (N)

62

Mass number

117

Half-Life

6.5 s

Abundance

---

Mass

116.929 u

Mass Excess

-66,340.0 keV

Spin

(3/2+)

Discovered

1978

Binding energy per nucleon

8,271 keV

Neutron separation energy

12,371 keV

Proton separation energy

582 keV

Decay Mode

β⁺Xenon-117100%

Decay chain

Caesium-117Z 55 · N 626.5 s
β⁺100%
β⁺99.997%
β⁺100%
β⁺100%
β⁺100%