Lanthanum-140 (La-140)

Identity

Protons

57

Neutrons

83

Mass number

140

Mass

139.91 ± 0.65 u

Mass excess

-84.312 MeV

Spin

3-*

Stability

Half-life: 1.68 days

Natural occurrence

Not found in nature

Decays to

• beta minus → Ce-140

Produced by

• Ba-140