Db

Dubnium-258m

Protons (Z)

105

Neutrons (N)

153

Mass number

258

Half-Life

4.41 s

Abundance

---

Mass

258.109 u

Mass Excess

101,560.0 keV

Spin

(5+)

Discovered

1981

Binding energy per nucleon

7,359 keV

Neutron separation energy

6,661 keV

Proton separation energy

1,595 keV

Decay Mode

SF

Decay chain

Dubnium-258Z 105 · N 1534.41 s
α77%
α71.7%
β⁺92.974%
α~100%
α~100%
α~100%
α~100%
α~100%
α~100%
α~100%
α100%
α99.98%
β⁻100%
β⁻99.976%
α100%
β⁻~100%
β⁻~100%
α100%