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Isotopes of the Element Aluminum

[Click for Main Data]         Proton Emission     Neutron Emission     Electron Emission     Positron Emission

Most of the isotope data on this site has been obtained from the National Nuclear Data Center.

Naturally Occurring Isotopes

Mass NumberNatural AbundanceHalf-life
27100%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
21< 35 nanosecondsProton EmissionNo Data Available
2291.1 millisecondsElectron Capture with
delayed Alpha Decay
0.04%
Electron Capture100.00%
Electron Capture with
delayed Proton Emission
54.50%
Electron Capture with
delayed Double Proton Emission  
1.10%
23446 millisecondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
1.22%
242.053 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
1.6×10-3 %
Electron Capture with
delayed Alpha Decay
0.04%
24m130 millisecondsIsomeric Transition82.50%
Electron Capture17.50%
Electron Capture with
delayed Alpha Decay
0.03%
257.183 secondsElectron Capture100.00%
267.17×10+5 yearsElectron Capture100.00%
26m6.3464 secondsElectron Capture100.00%
27STABLE--
282.2414 minutesBeta-minus Decay100.00%
296.56 minutesBeta-minus Decay100.00%
303.62 secondsBeta-minus Decay100.00%
31644 millisecondsBeta-minus Decay100.00%
3233.0 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
0.70%
3341.7 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
8.50%
3442 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
27.00%
3537.2 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
38.00%
3690 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
< 31.00%
3710.7 millisecondsBeta-minus Decay100.00%
387.6 millisecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
397.6 millisecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
40> 260 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
41> 260 nanosecondsBeta-minus DecayNo Data Available
42> 170 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
43> 170 nanoseconds   Beta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available