Niobium-91 (Nb-91)

Identity

Protons

41

Neutrons

50

Mass number

91

Mass

90.9 ± 3.1 u

Mass excess

-86.638 MeV

Spin

9/2+*

Stability

Half-life: 680 years

Natural occurrence

Not found in nature

Decays to

• electron capture 100.0 % → Zr-91
• positron emission 0.014 % → Zr-91