Barium-131 (Ba-131)

Identity

Protons

56

Neutrons

75

Mass number

131

Mass

130.91 ± 0.45 u

Mass excess

-86.679 MeV

Spin

1/2+*

Stability

Half-life: 11.5 days

Natural occurrence

Not found in nature

Decays to

• positron emission → Cs-131