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Isotopes of zinc

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Isotopes of zinc (30Zn)
Main isotopes Decay
abun­dance half-life (t1/2) mode pro­duct
Zn 49.2% stable
Zn synth 244 d β Cu
Zn 27.7% stable
Zn 4% stable
Zn 18.5% stable
Zn synth 56 min β Ga
Zn synth 13.8 h β Ga
Zn 0.6% stable
Zn synth 2.4 min β Ga
Zn synth 4 h β Ga
Zn synth 46.5 h β Ga
Standard atomic weight Ar°(Zn)

Naturally occurring zinc (30Zn) is composed of the 5 stable isotopes Zn, Zn, Zn, Zn, and Zn with Zn being the most abundant (48.6% natural abundance). Twenty-eight radioisotopes have been characterised with the most stable being Zn with a half-life of 244.26 days, and then Zn with a half-life of 46.5 hours. All of the remaining radioactive isotopes have half-lives that are less than 14 hours and the majority of these have half-lives that are less than 1 second. This element also has 10 meta states.

Zinc has been proposed as a "salting" material for nuclear weapons. A jacket of isotopically enriched Zn, irradiated by the intense high-energy neutron flux from an exploding thermonuclear weapon, would transmute into the radioactive isotope Zn with a half-life of 244 days and produce approximately 1.115 MeV of gamma radiation, significantly increasing the radioactivity of the weapon's fallout for several years. Such a weapon is not known to have ever been built, tested, or used.

List of isotopes


Nuclide
Z N Isotopic mass (Da)
Half-life
Decay
mode

Daughter
isotope

Spin and
parity
Natural abundance (mole fraction)
Excitation energy Normal proportion Range of variation
Zn 30 24 53.99388(23)# 1.8(5) ms 2p Ni 0+
Zn 30 25 54.98468(43)# 19.8(13) ms β, p (91.0%) Ni 5/2−#
β (9.0%) Cu
Zn 30 26 55.97274(43)# 32.4(7) ms β, p (88.0%) Ni 0+
β (12.0%) Cu
Zn 30 27 56.96506(22)# 45.7(6) ms β, p (87%) Ni 7/2−#
β (13%) Cu
Zn 30 28 57.954590(54) 86.0(19) ms β (99.3%) Cu 0+
β, p (0.7%) Ni
Zn 30 29 58.94931189(81) 178.7(13) ms β (99.90%) Cu 3/2−
β, p (0.10%) Ni
Zn 30 30 59.94184132(59) 2.38(5) min β Cu 0+
Zn 30 31 60.939507(17) 89.1(2) s β Cu 3/2−
Zn 30 32 61.93433336(66) 9.193(15) h β Cu 0+
Zn 30 33 62.9332111(17) 38.47(5) min β Cu 3/2−
Zn 30 34 63.92914178(69) Observationally Stable 0+ 0.4917(75)
Zn 30 35 64.92924053(69) 243.94(4) d EC (98.579(7)%) Cu 5/2−
β (1.421(7)%)
Zn 53.928(10) keV 1.6(6) μs IT Zn 1/2−
Zn 30 36 65.92603364(80) Stable 0+ 0.2773(98)
Zn 30 37 66.92712742(81) Stable 5/2− 0.0404(16)
Zn 93.312(5) keV 9.15(7) μs IT Zn 1/2−
Zn 604.48(5) keV 333(14) ns IT Zn 9/2+
Zn 30 38 67.92484423(84) Stable 0+ 0.1845(63)
Zn 30 39 68.92655036(85) 56.4(9) min β Ga 1/2−
Zn 438.636(18) keV 13.747(11) h IT (99.97%) Zn 9/2+
β (0.033%) Ga
Zn 30 40 69.9253192(21) Observationally Stable 0+ 0.0061(10)
Zn 30 41 70.9277196(28) 2.40(5) min β Ga 1/2−
Zn 157.7(13) keV 4.148(12) h β Ga 9/2+
IT? Zn
Zn 30 42 71.9268428(23) 46.5(1) h β Ga 0+
Zn 30 43 72.9295826(20) 24.5(2) s β Ga 1/2−
Zn 195.5(2) keV 13.0(2) ms IT Zn 5/2+
Zn 30 44 73.9294073(27) 95.6(12) s β Ga 0+
Zn 30 45 74.9328402(21) 10.2(2) s β Ga 7/2+
Zn 126.94(9) keV 5# s β? Ga 1/2−
IT? Zn
Zn 30 46 75.9331150(16) 5.7(3) s β Ga 0+
Zn 30 47 76.9368872(21) 2.08(5) s β Ga 7/2+
Zn 772.440(15) keV 1.05(10) s β (66%) Ga 1/2−
IT (34%) Zn
Zn 30 48 77.9382892(21) 1.47(15) s β Ga 0+
β, n? Ga
Zn 2673.7(6) keV 320(6) ns IT Zn (8+)
Zn 30 49 78.9426381(24) 746(42) ms β (98.3%) Ga 9/2+
β, n (1.7%) Ga
Zn 942(10) keV >200 ms β? Ga 1/2+
IT? Zn
Zn 30 50 79.9445529(28) 562.2(30) ms β (98.64%) Ga 0+
β, n (1.36%) Ga
Zn 30 51 80.9504026(54) 299.4(21) ms β (77%) Ga (1/2+, 5/2+)
β, n (23%) Ga
β, 2n? Ga
Zn 30 52 81.9545741(33) 177.9(25) ms β, n (69%) Ga 0+
β (31%) Ga
β, 2n? Ga
Zn 30 53 82.96104(32)# 100(3) ms β, n (71%) Ga 3/2+#
β (29%) Ga
β, 2n? Ga
Zn 30 54 83.96583(43)# 54(8) ms β, n (73%) Ga 0+
β (27%) Ga
β, 2n? Ga
Zn 30 55 84.97305(54)# 40# ms β? Ga 5/2+#
β, n? Ga
β, 2n? Ga
Zn 30 56 85.97846(54)# β? Ga 0+
β, n? Ga
Zn 30 57
This table header & footer:
  1. Zn – 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. ^ # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
  5. Modes of decay:
    IT: Isomeric transition
    n: Neutron emission
    p: Proton emission
  6. Bold symbol as daughter – Daughter product is stable.
  7. ( ) spin value – Indicates spin with weak assignment arguments.
  8. Believed to undergo ββ decay to Ni with a half-life over 6.0×10 y
  9. Believed to undergo ββ decay to Ge with a half-life over 3.8×10 y

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. "Standard Atomic Weights: Zinc". CIAAW. 2007.
  3. 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.
  4. Roost, E.; Funck, E.; Spernol, A.; Vaninbroukx, R. (1972). "The decay of Zn". Zeitschrift für Physik. 250 (5): 395–412. Bibcode:1972ZPhy..250..395D. doi:10.1007/BF01379752. S2CID 124728537.
  5. D. T. Win, M. Al Masum (2003). "Weapons of Mass Destruction" (PDF). Assumption University Journal of Technology. 6 (4): 199–219.
  6. Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf.
  7. "Zn ε decay" (PDF). NNDC Chart of Nuclides.
  8. Nies, L.; Canete, L.; Dao, D. D.; Giraud, S.; Kankainen, A.; Lunney, D.; Nowacki, F.; Bastin, B.; Stryjczyk, M.; Ascher, P.; Blaum, K.; Cakirli, R. B.; Eronen, T.; Fischer, P.; Flayol, M.; Girard Alcindor, V.; Herlert, A.; Jokinen, A.; Khanam, A.; Köster, U.; Lange, D.; Moore, I. D.; Müller, M.; Mougeot, M.; Nesterenko, D. A.; Penttilä, H.; Petrone, C.; Pohjalainen, I.; de Roubin, A.; Rubchenya, V.; Schweiger, Ch.; Schweikhard, L.; Vilen, M.; Äystö, J. (30 November 2023). "Further Evidence for Shape Coexistence in Zn 79 m near Doubly Magic Ni 78". Physical Review Letters. 131 (22). arXiv:2310.16915. doi:10.1103/PhysRevLett.131.222503.
  9. ^ Shimizu, Y.; Kubo, T.; Sumikama, T.; Fukuda, N.; Takeda, H.; Suzuki, H.; Ahn, D. S.; Inabe, N.; Kusaka, K.; Ohtake, M.; Yanagisawa, Y.; Yoshida, K.; Ichikawa, Y.; Isobe, T.; Otsu, H.; Sato, H.; Sonoda, T.; Murai, D.; Iwasa, N.; Imai, N.; Hirayama, Y.; Jeong, S. C.; Kimura, S.; Miyatake, H.; Mukai, M.; Kim, D. G.; Kim, E.; Yagi, A. (8 April 2024). "Production of new neutron-rich isotopes near the N = 60 isotones Ge 92 and As 93 by in-flight fission of a 345 MeV/nucleon U 238 beam". Physical Review C. 109 (4). doi:10.1103/PhysRevC.109.044313.

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Isotopes of the chemical elements
Group 1 2   3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Period Hydrogen and
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earth metals
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