Ce

Cerium-139m

Protons (Z)

58

Neutrons (N)

81

Mass number

139

Half-Life

57.58 s

Abundance

---

Mass

138.907 u

Mass Excess

-86,203.5 keV

Spin

11/2-

Discovered

1967

Binding energy per nucleon

8,365 keV

Neutron separation energy

6,709 keV

Proton separation energy

6,979 keV

Decay Mode

γCerium-139100%

Decay chain

Cerium-139Z 58 · N 8157.58 s
γ100%
EC100%