Aluminium-26
Properties and data of the isotope 26Al.
See also: list of Aluminium isotopes.
General data
Name of the isotope:Aluminium-26; Al-26Symbol:26Al or 2613AlMass number A:26 (= number of nucleons)Atomic number Z:13 (= number of protons)Neutrons N:13Isotopic mass:25.98689186(7) u (atomic weight of Aluminium-26)Nuclide mass:25.9797604 u (calculated nuclear mass without electrons)Mass excess:-12.21015 MeVMass defect:0.227477464 u (per nucleus)Nuclear binding energy:211.89389285 MeV (per nucleus)
8.14976511 MeV (average binding energy per nucleon)Separation energy:SN = 11.36549(7) MeV (first neutron)
SP = 6.30634(6) MeV (first proton)Half-life:7.17(24) × 105 aDecay constant λ:3.065488822009 × 10-14 s-1Specific activity α:738432219.62814 Bq g-1
0.019957627557517 Ci g-1Spin and parity:
(nuclear angular momentum)5+Isobaric spin: 0Magnetic dipole moment:μ(μN) = +2.803(4)Quadrupole moment Q:+0.27(4) barn (100 fm2)Nuclear g-factor:gl = 0.5606Year of discovery:1934
Radioactive Decay
Half-life T½ = 7.17(24) × 105 a respectively 2.261131 × 1013 seconds s.
| Decay mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EE β+ | 26Mg | 100 % | 4.00439(7) MeV | |
Parent Nuclides
Direct parent isotopes are: 26Si, 27P.
Occurrence
Comparison of the natural Aluminium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
| | Atomic Mass ma | Quantity | Half-life | Spin |
|---|
Aluminium
Isotopic mixture | 26.9815384 u | 100 % | | |
| Isotope 26Al | 25.98689186(7) u |
[trace] | 7.17(24) × 105 a | 5+ |
| Isotope 27Al | 26.9815385(7) u | 100 % | stable | 5/2+ |
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
| Nuclear Isomer | Excitation Energy | Half-life | Spin |
|---|
| 26mAl | 228.305(13) keV | 6.3460(8) s | 0+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 13) and isobaric (same nucleon number A = 26) with Aluminium-26. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| OZ | Isotone N = 13 | Isobar A = 26 |
|---|
| 5 | 18B | |
| 6 | 19C | |
| 7 | 20N | |
| 8 | 21O | 26O |
| 9 | 22F | 26F |
| 10 | 23Ne | 26Ne |
| 11 | 24Na | 26Na |
| 12 | 25Mg | 26Mg |
| 13 | 26Al | 26Al |
| 14 | 27Si | 26Si |
| 15 | 28P | 26P |
| 16 | 29S | 26S |
| 17 | 30Cl | |
| 18 | 31Ar | |
| 19 | 32K | |
External data and identifiers
Last update: 2020-10-12
Perma link: https://www.chemlin.org/isotope/aluminium-26
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