Cobalt-57 (Co-57)

Identity

Protons

27

Neutrons

30

Mass number

57

Mass

56.94 ± 0.55 u

Mass excess

-59.346 MeV

Spin

7/2-*

Stability

Half-life: 272 days

Natural occurrence

Not found in nature

Decays to

• electron capture → Fe-57

Produced by

• Ni-57