Rb

Rubidium-81

Protons (Z)

37

Neutrons (N)

44

Mass number

81

Half-Life

4.57 h

Abundance

---

Mass

80.919 u

Mass Excess

-75,457.0 keV

Spin

3/2-

Discovered

1949

Binding energy per nucleon

8,646 keV

Neutron separation energy

11,353 keV

Proton separation energy

4,852 keV

Decay Mode

β⁺Krypton-81100%

Decay chain

Rubidium-81Z 37 · N 444.57 h
β⁺100%
EC100%