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Aluminium-28

Properties and data of the isotope 28Al.


Contents

 

Aluminium-28 isotope

Aluminium-28 (Aluminum-28) is a radioisotope of the chemical element aluminium, which has 15 neutrons in the atomic nucleus in addition to the element-specific 13 protons, resulting in a mass number of 28. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of 28Al serves exclusively academic purposes.

The discovery of the radioactive isotope was reported in 1934 by I. Curie and F. Joliot, who observed aluminium-28 during the irradiation of a Mg template with alpha particles [1].

Another method for producing the nuclide 28Al is the irradiation of silicon-29 with deuterons (hydrogen-2 nuclei) [2]:

29Si(d,3He)28Al.

See also: list of Aluminium isotopes.

 

General data

Name of the isotope:Aluminium-28; Al-28Symbol:28Al or 2813AlMass number A:28 (= number of nucleons)Atomic number Z:13 (= number of protons)Neutrons N:15Isotopic mass:27.98191001(5) u (atomic weight of Aluminium-28)Nuclide mass:27.9747785 u (calculated nuclear mass without electrons)Mass excess:-16.85072 MeVMass defect:0.249789146 u (per nucleus)Nuclear binding energy:232.67709076 MeV (per nucleus)
8.3098961 MeV (average binding energy per nucleon)
Separation energy:SN = 7.725174(11) MeV (first neutron)
SP = 9.55310(7) MeV (first proton)
Half-life:2.245(2) minDecay constant λ:0.0051458588014844 s-1Specific activity α:1.147743946217 × 10+20 Bq g-1
3102010665.4538 Ci g-1
Spin and parity:
(nuclear angular momentum)
3+Magnetic dipole moment:μ(μN) = 3.241(5)Quadrupole moment Q:0.175(14) barn (100 fm2)Nuclear g-factor:gl = 1.0803333333333Mirror nucleus:Phosphorus-28Year of discovery:1934

 

Radioactive Decay

Half-life T½ = 2.245(2) min (minutes) respectively 1.3470 × 102 seconds s.

Decay
mode
DaughterProbabilityDecay energyDetailsγ energy
(intensity)
β-28Si100 %4.64208(5) MeVβ-: 1.241.80 MeV
99.99(1) %
1.778987(15) MeV
100 %

 

Parent Nuclides

Direct parent isotope is: 28Mg.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 15) and isobaric (same nucleon number A = 28) with Aluminium-28. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 15Isobar A = 28
520B
621C
722N
823O28O
924F28F
1025Ne28Ne
1126Na28Na
1227Mg28Mg
1328Al28Al
1429Si28Si
1530P28P
1631S28S
1732Cl28Cl
1833Ar
1934K
2035Ca
2136Sc

 

External data and identifiers

SMILES:[28Al]Adopted Levels, Gammas:NuDat 28Al

 

Literature and References

[1] - Irène Curie, F. Joliot:
Production artificielle d'éléments radioactifs - II. Preuve chimique de la transmutation des éléments.
In: J. Phys. Radium, 5, 4, (1934), DOI 10.1051/jphysrad:0193400504015300.

[2] - J. Vernotte et al.:
29Si(d,3He)28Al reaction at 29 MeV.
In: Physical Review C, (1994), DOI 10.1103/PhysRevC.49.1559.

 


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Last update: 2024-11-07


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