Pa

Protactinium-227

Protons (Z)

91

Neutrons (N)

136

Mass number

227

Half-Life

38.3 m

Abundance

---

Mass

227.029 u

Mass Excess

26,830.0 keV

Spin

(5/2-)

Discovered

1948

Binding energy per nucleon

7,639 keV

Neutron separation energy

7,275 keV

Proton separation energy

3,657 keV

Decay Mode

Decay chain

Protactinium-227Z 91 · N 13638.3 m
α85%
α99%
α100%
α100%
α~100%
β⁻100%