Cs
Caesium-120m
Protons (Z)
55
Neutrons (N)
65
Mass number
120
Half-Life
57.0 s
Abundance
---
Mass
119.921 u
Mass Excess
-73,790.0 keV
Spin
(7-)
Discovered
1977
Binding energy per nucleon
8,328 keV
Neutron separation energy
9,556 keV
Proton separation energy
2,285 keV
Decay Mode
Decay chain
- CsCaesium-120Z 55 · N 6557.0 s
- β⁺~100%
- β⁺100%
- β⁺100%