Pr

Praseodymium-138m

Protons (Z)

59

Neutrons (N)

79

Mass number

138

Half-Life

2.12 h

Abundance

---

Mass

137.911 u

Mass Excess

-82,779.0 keV

Spin

7-

Discovered

1958

Binding energy per nucleon

8,337 keV

Neutron separation energy

7,648 keV

Proton separation energy

4,149 keV

Decay Mode

β⁺Cerium-138100%

Decay chain

Praseodymium-138Z 59 · N 792.12 h
β⁺100%