La
Lanthanum-121
Protons (Z)
57
Neutrons (N)
64
Mass number
121
Half-Life
5.3 s
Abundance
---
Mass
120.933 u
Mass Excess
-62,190.0 keV
Spin
(11/2-)
Discovered
1988
Binding energy per nucleon
8,217 keV
Neutron separation energy
12,691 keV
Proton separation energy
589 keV
Decay Mode
Decay chain
- LaLanthanum-121Z 57 · N 645.3 s
- β⁺100%
- β⁺99.98%
- β⁺100%
- β⁺100%
- β⁺100%
- β⁺100%