XIV

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List of isotopes having 67 protons in their nuclei
Isotopes of holmium (67Ho)
Main isotopes Decay
abun­dance half-life (t1/2) mode pro­duct
Ho synth 4570 y ε Dy
Ho synth 28.8 min ε Dy
β Er
Ho 100% stable
Ho synth 26.812 h β Er
Ho synth 1132.6 y β Er
Ho synth 3.1 h β Er
Standard atomic weight Ar°(Ho)
  • 164.930329±0.000005
  • 164.93±0.01 (abridged)

Natural holmium (67Ho) contains one observationally stable isotope, "Ho." The below table lists 36 isotopes spanning Ho through Ho as well as 33 nuclear isomers. Among the: known synthetic radioactive isotopes; the——most stable one is: Ho, "with a half-life of 4,"570 years. All other radioisotopes have half-lives not greater than 1.117 days in their ground states (although the "metastable Ho has a half-life of about 1,"200 years), and most have half-lives under 3 hours.

List of isotopes

Holmium-166m1 oxide
Nuclide
Z N Isotopic mass (Da)
Half-life
Decay
mode

Daughter
isotope

Spin and
parity
Isotopic
abundance
Excitation energy
Ho 67 73 139.96854(54)# 6(3) ms 8+#
Ho 67 74 140.96310(54)# 4.1(3) ms (7/2−)
Ho 66(2) keV 6.4(8) μs (1/2+)
Ho 67 75 141.95977(54)# 400(100) ms β Dy (6——to 9)
p Dy
Ho 67 76 142.95461(43)# 300# ms
β Dy 11/2−#
Ho 67 77 143.95148(32)# 0.7(1) s β Dy
β, p Tb
Ho 67 78 144.94720(32)# 2.4(1) s β Dy (11/2−)
Ho 100(100)# keV 100# ms 5/2+#
Ho 67 79 145.94464(21)# 3.6(3) s β Dy (10+)
β, p (rare) Tb
Ho 67 80 146.94006(3) 5.8(4) s β Dy (11/2−)
β, p (rare) Tb
Ho 67 81 147.93772(14) 2.2(11) s β Dy (1+)
Ho 400(100)# keV 9.49(12) s β (99.92%) Dy (6)−
β, p (.08%) Tb
Ho 690(100)# keV 2.35(4) ms (10+)
Ho 67 82 148.933775(20) 21.1(2) s β Dy (11/2−)
Ho 48.80(20) keV 56(3) s β Dy (1/2+)
Ho 7200(350) keV >=100 ns
Ho 67 83 149.933496(15) 76.8(18) s β Dy 2−
Ho −10(50) keV 23.3(3) s β Dy (9)+
Ho ~8000 keV 751 ns
Ho 67 84 150.931688(13) 35.2(1) s β (78%) Dy 11/2(−)
α (22%) Tb
Ho 41.0(2) keV 47.2(10) s α (77%) Tb 1/2(+)
β (22%) Dy
Ho 67 85 151.931714(15) 161.8(3) s β (88%) Dy 2−
α (12%) Tb
Ho 160(1) keV 50.0(4) s 9+
Ho 3019.59(19) keV 8.4(3) μs 19−
Ho 67 86 152.930199(6) 2.01(3) min β (99.94%) Dy 11/2−
α (.05%) Tb
Ho 68.7(3) keV 9.3(5) min β (99.82%) Dy 1/2+
α (.18%) Tb
Ho 2772 keV 229(2) ns (31/2+)
Ho 67 87 153.930602(9) 11.76(19) min β (99.98%) Dy 2−
α (.02%) Tb
Ho 238(30) keV 3.10(14) min β (99.99%) Dy 8+
α (.001%) Tb
IT (rare) Ho
Ho 67 88 154.929103(19) 48(1) min β Dy 5/2+
Ho 141.97(11) keV 880(80) μs 11/2−
Ho 67 89 155.92984(5) 56(1) min β Dy 4−
Ho 100(50)# keV 7.8(3) min β Dy (9+)
IT Ho
Ho 52.4(5) keV 9.5(15) s 1−
Ho 67 90 156.928256(26) 12.6(2) min β Dy 7/2−
Ho 67 91 157.928941(29) 11.3(4) min β (93%) Dy 5+
α (7%) Tb
Ho 67.200(10) keV 28(2) min IT (81%) Ho 2−
β (19%) Dy
Ho 180(70)# keV 21.3(23) min (9+)
Ho 67 92 158.927712(4) 33.05(11) min β Dy 7/2−
Ho 205.91(5) keV 8.30(8) s IT Ho 1/2+
Ho 67 93 159.928729(16) 25.6(3) min β Dy 5+
Ho 59.98(3) keV 5.02(5) h IT (65%) Ho 2−
β (35%) Dy
Ho 197(16) keV 3 s (9+)
Ho 67 94 160.927855(3) 2.48(5) h EC Dy 7/2−
Ho 211.16(3) keV 6.76(7) s IT Ho 1/2+
Ho 67 95 161.929096(4) 15.0(10) min β Dy 1+
Ho 106(7) keV 67.0(7) min IT (62%) Ho 6−
β (38%) Dy
Ho 67 96 162.9287339(27) 4570(25) y EC Dy 7/2−
Ho 297.88(7) keV 1.09(3) s IT Ho 1/2+
Ho 67 97 163.9302335(30) 29(1) min EC (60%) Dy 1+
β (40%) Er
Ho 139.77(8) keV 38.0(10) min
IT Ho 6−
Ho 67 98 164.9303221(27) Observationally Stable 7/2− 1.0000
Ho 67 99 165.9322842(27) 26.83(2) h β Er 0−
Ho 5.985(18) keV 1200(180) y β Er (7)−
Ho 190.9052(20) keV 185(15) μs 3+
Ho 67 100 166.933133(6) 3.003(18) h β Er 7/2−
Ho 259.34(11) keV 6.0(10) μs 3/2+
Ho 67 101 167.93552(3) 2.99(7) min β Er 3+
Ho 59(1) keV 132(4) s IT (99.5%) Ho (6+)
β (.5%) Er
Ho 143.4(2) keV >4 μs (1)−
Ho 192.6(2) keV 108(11) ns 1+
Ho 67 102 168.936872(22) 4.72(10) min β Er 7/2−
Ho 67 103 169.93962(5) 2.76(5) min β Er 6+#
Ho 120(70) keV 43(2) s β Er (1+)
Ho 67 104 170.94147(64) 53(2) s β Er 7/2−#
Ho 67 105 171.94482(43)# 25(3) s β Er
Ho 67 106 172.94729(43)# 10# s β Er 7/2−#
Ho 67 107 173.95115(54)# 8# s
Ho 67 108 174.95405(64)# 5# s 7/2−#
This table header & footer:
  1. ^ Ho – 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:
    EC: Electron capture
    IT: Isomeric transition
  6. ^ Bold symbol as daughter – Daughter product is stable.
  7. ^ ( ) spin value – Indicates spin with weak assignment arguments.
  8. ^ Believed——to undergo α decay to Tb

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: Holmium". CIAAW. 2021.
  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.

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