Rf
Rutherfordium-257
Protons (Z)
104
Neutrons (N)
153
Mass number
257
Half-Life
5.0 s
Abundance
---
Mass
257.103 u
Mass Excess
95,866.0 keV
Spin
(1/2+)
Discovered
1969
Binding energy per nucleon
7,382 keV
Neutron separation energy
6,427 keV
Proton separation energy
3,173 keV
Decay Mode
- SF1.3%
Decay chain
- RfRutherfordium-257Z 104 · N 1535.0 s
- α89.3%
- α55%
- α33%
- β⁺64.7%
- EC99.88%
- α~100%
- β⁻~100%
- α~100%
- α~100%
- β⁻100%
- α~100%
- α100%
- β⁻100%
- α~100%
- α~100%
- α99.992%
- β⁻97.91%
- α100%
- β⁻100%
- α100%