Isotopes of aluminium

Nuclides with atomic number of 13 but with different mass numbers
(13Al)
Main isotopes[1] Decay
abun­dance half-life (t1/2) mode pro­duct
26Al trace 7.17×105 y β+84% 26Mg
ε[2]16% 26Mg
γ
27Al 100% stable
Standard atomic weight Ar°(Al)
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Aluminium or aluminum (13Al) has 22 known isotopes from 22Al to 43Al and 4 known isomers. Only 27Al (stable isotope) and 26Al (radioactive isotope, t1/2 = 7.2×105 y) occur naturally, however 27Al comprises nearly all natural aluminium. Other than 26Al, all radioisotopes have half-lives under 7 minutes, most under a second. The standard atomic weight is 26.9815385(7). 26Al is produced from argon in the atmosphere by spallation caused by cosmic-ray protons. Aluminium isotopes have found practical application in dating marine sediments, manganese nodules, glacial ice, quartz in rock exposures, and meteorites. The ratio of 26Al to 10Be has been used to study the role of sediment transport, deposition, and storage, as well as burial times, and erosion, on 105 to 106 year time scales.[citation needed] 26Al has also played a significant role in the study of meteorites.

List of isotopes

Nuclide[5]
[n 1]
Z N Isotopic mass (Da)[6]
[n 2][n 3]
Half-life
Decay
mode
[n 4]
Daughter
isotope
[n 5]
Spin and
parity
[n 6][n 7]
Natural abundance (mole fraction)
Excitation energy[n 7] Normal proportion Range of variation
22Al 13 9 22.01954(43)# 91.1(5) ms β+, p (55%) 21Na (4)+
β+ (43.862%) 22Mg
β+, 2p (1.1%) 20Ne
β+, α (0.038%) 18Ne
23Al 13 10 23.0072444(4) 470(30) ms β+ (99.54%) 23Mg 5/2+
β+, p (0.46%) 22Na
24Al 13 11 23.99994754(25) 2.053(4) s β+ (99.9634%) 24Mg 4+
β+, α (.035%) 20Ne
β+, p (.0016%) 23Na
24mAl 425.8(1) keV 130(3) ms IT (82.5%) 24Al 1+
β+ (17.5%) 24Mg
β+, α (.028%) 20Ne
25Al 13 12 24.99042831(7) 7.183(12) s β+ 25Mg 5/2+
26Al[n 8] 13 13 25.98689186(7) 7.17(24)×105 y β+ (85%) 26Mg 5+ Trace[n 9]
ε (15%)[7]
26mAl 228.306(13) keV 6.3460(8) s β+ 26Mg 0+
27Al 13 14 26.98153841(5) Stable 5/2+ 1.0000
28Al 13 15 27.98191009(8) 2.245(5) min β 28Si 3+
29Al 13 16 28.9804532(4) 6.56(6) min β 29Si 5/2+
30Al 13 17 29.982968(3) 3.62(6) s β 30Si 3+
31Al 13 18 30.9839498(24) 644(25) ms β (98.4%) 31Si 5/2(+)
β, n (1.6%) 30Si
32Al 13 19 31.988084(8) 33.0(2) ms β (99.3%) 32Si 1+
β, n (.7%) 31Si
32mAl 955.7(4) keV 200(20) ns IT 32Al (4+)
33Al 13 20 32.990878(8) 41.7(2) ms β (91.5%) 33Si 5/2+
β, n (8.5%) 32Si
34Al 13 21 33.996779(3) 56.3(5) ms β (74%) 34Si (4−)
β, n (26%) 33Si
34mAl 550(100)# keV 26(1) ms β (70%) 34Si (1+)
β, n (30%) 33Si
35Al 13 22 34.999760(8) 37.2(8) ms β (62%) 35Si 5/2+#
β, n (38%) 34Si
36Al 13 23 36.00639(16) 90(40) ms β (70%) 36Si
β, n (30%) 35Si
37Al 13 24 37.01053(19) 11.5(4) ms β (71%) 37Si 5/2+#
β, n (29%) 36Si
38Al 13 25 38.0174(4) 9.0(7) ms β 38Si
39Al 13 26 39.02217(43)# 7.6(16) ms β, n (90%) 38Si 5/2+#
β (10%) 39Si
40Al 13 27 40.02962(43)# 5.7(3 (stat), 2 (sys)) ms[8] β, n (64%) 39Si
β, 2n (20%) 38Si
β (16%) 40Si
41Al 13 28 41.03588(54)# 3.5(8 (stat), 4 (sys)) ms[8] β, n (86%) 40Si 5/2+#
β, 2n (11%) 39Si
β (3%) 41Si
42Al 13 29 42.04305(64)# 1# ms [>170 ns] β 42Si
43Al 13 30 43.05048(86)# 1# ms [>170 ns] β 43Si
This table header & footer:
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  1. ^ mAl – Excited nuclear isomer.
  2. ^ ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
  3. ^ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
  4. ^ Modes of decay:
    IT: Isomeric transition
  5. ^ Bold symbol as daughter – Daughter product is stable.
  6. ^ ( ) spin value – Indicates spin with weak assignment arguments.
  7. ^ a b # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
  8. ^ Used in radiodating events early in the Solar System's history and meteorites
  9. ^ cosmogenic

Aluminium-26

The decay level scheme for 26Al and 26mAl to 26Mg.[7][9]

Cosmogenic aluminium-26 was first described in studies of the Moon and meteorites. Meteorite fragments, after departure from their parent bodies, are exposed to intense cosmic-ray bombardment during their travel through space, causing substantial 26Al production. After falling to Earth, atmospheric shielding protects the meteorite fragments from further 26Al production, and its decay can then be used to determine the meteorite's terrestrial age. Meteorite research has also shown that 26Al was relatively abundant at the time of formation of our planetary system. Most meteoriticists believe that the energy released by the decay of 26Al was responsible for the melting and differentiation of some asteroids after their formation 4.55 billion years ago.[10]

References

  1. ^ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
  2. ^ Mougeot, X. (2019). "Towards high-precision calculation of electron capture decays". Applied Radiation and Isotopes. 154 (108884). doi:10.1016/j.apradiso.2019.108884.
  3. ^ "Standard Atomic Weights: Aluminium". CIAAW. 2017.
  4. ^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
  5. ^ Half-life, decay mode, nuclear spin, and isotopic composition is sourced in:
    Audi, G.; Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S. (2017). "The NUBASE2016 evaluation of nuclear properties" (PDF). Chinese Physics C. 41 (3): 030001. Bibcode:2017ChPhC..41c0001A. doi:10.1088/1674-1137/41/3/030001.
  6. ^ Wang, M.; Audi, G.; Kondev, F. G.; Huang, W. J.; Naimi, S.; Xu, X. (2017). "The AME2016 atomic mass evaluation (II). Tables, graphs, and references" (PDF). Chinese Physics C. 41 (3): 030003-1–030003-442. doi:10.1088/1674-1137/41/3/030003.
  7. ^ a b "Physics 6805 Topics in Nuclear Physics". Ohio State University. Retrieved 12 June 2019.
  8. ^ a b Crawford, H. L.; Tripathi, V.; Allmond, J. M.; et al. (2022). "Crossing N = 28 toward the neutron drip line: first measurement of half-lives at FRIB". Physical Review Letters. 129 (212501): 212501. Bibcode:2022PhRvL.129u2501C. doi:10.1103/PhysRevLett.129.212501. PMID 36461950. S2CID 253600995.
  9. ^ Diehl, R (13 Dec 2005). "26Al in the inner Galaxy" (PDF). Astronomy & Astrophysics. 449 (3): 1025–1031. doi:10.1051/0004-6361:20054301. Retrieved 12 June 2019.
  10. ^ R. T. Dodd (1986). Thunderstones and Shooting Stars. Harvard University Press. pp. 89–90. ISBN 978-0-674-89137-1.

External links

  • Aluminum isotopes data from The Berkeley Laboratory Isotopes Project's
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Group 1 2   3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Period Hydrogen and
alkali metals
Alkaline
earth metals
Pnicto­gens Chal­co­gens Halo­gens Noble gases
1 2
3 4 5 6 7 8 9 10
11 12
Isotopes § List
13
14 15 16 17 18
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
55 56 1 asterisk 71 72 73 74 75 76 77 78 79
Hg
80
81 82 83 84 85 86
87 88 1 asterisk 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
119 120
1 asterisk 57 58 59 60 61 62 63 64 65 66 67 68 69 70  
1 asterisk 89 90 91 92 93 94 95 96 97 98 99 100 101 102
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