Protactinium-233 (Pa-233)

Identity

Protons

91

Neutrons

142

Mass number

233

Mass

233.0 ± 1.4 u

Mass excess

37.489 MeV

Spin

3/2-*

Stability

Half-life: 27 days

Natural occurrence

Not found in nature

Decays to

• beta minus → U-233

Produced by

• Np-237