Promethium-143 (Pm-143)

Identity

Protons

61

Neutrons

82

Mass number

143

Mass

142.9 ± 3.2 u

Mass excess

-82.961 MeV

Spin

5/2+

Stability

Half-life: 265 days

Natural occurrence

Not found in nature

Decays to

• electron capture 100.0 % → Nd-143
• positron emission 0.0000057 % → Nd-143

Produced by

• Eu-147