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Isotopes of the Element Nobelium
[Click for Main Data]

Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

All Known Isotopes of the Element Nobelium

Mass NumberHalf-lifeDecay ModeBranching Percentage
249No Data AvailableElectron CaptureNo Data Available
Alpha DecayNo Data Available
2500.25 millisecondsSpontaneous Fission<= 100.00
Alpha Decay0.10
Electron Capture1.0E-3
2510.8 secondsAlpha Decay<= 100.00
Spontaneous Fission<= 8.00
Electron CaptureNo Data Available
2522.27 secondsAlpha Decay58.00
Electron Capture23.00
Spontaneous Fission19.00
2531.62 minutesAlpha Decay<= 100.00
Electron CaptureNo Data Available
25451 secondsAlpha Decay90.00
Electron Capture10.00
Spontaneous Fission0.17
254m0.28 secondsIsomeric Transition> 80.00
2553.1 minutesAlpha Decay61.00
Electron Capture39.00
2562.91 secondsAlpha Decay99.47
Spontaneous Fission0.53
25725 secondsAlpha Decay<= 100.00
Spontaneous Fission<= 1.50
2581.2 millisecondsSpontaneous Fission<= 100.00
25958 minutesAlpha Decay75.00
Electron Capture25.00
Spontaneous Fission< 10.00
260106 millisecondsSpontaneous Fission100.00
261No Data AvailableBeta-minus DecayNo Data Available
Alpha DecayNo Data Available
262≈ 5 millisecondsSpontaneous Fission100.00