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Isotopes of holmium



Natural holmium (Ho) contains one stable isotope, holmium 165. Some synthetic radioactive isotopes are known, the most stable one is holmium 163, with a half life of 4570 years. All other radioisotopes have half lives not greater than 1.117 days, and most have half lives under 3 hours.
Standard atomic mass: 164.93032(2) u

Additional recommended knowledge

Table

nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life nuclear
spin
representative
isotopic
composition
(mole fraction)
range of natural
variation
(mole fraction)
excitation energy
140Ho 67 73 139.96854(54)# 6(3) ms 8+#
141Ho 67 74 140.96310(54)# 4.1(3) ms (7/2-)
141mHo 66(2) keV 6.4(8) µs (1/2+)
142Ho 67 75 141.95977(54)# 400(100) ms (6 to 9)
143Ho 67 76 142.95461(43)# 300# ms [>200 ns] 11/2-#
144Ho 67 77 143.95148(32)# 0.7(1) s
145Ho 67 78 144.94720(32)# 2.4(1) s (11/2-)
145mHo 100(100)# keV 100# ms 5/2+#
146Ho 67 79 145.94464(21)# 3.6(3) s (10+)
147Ho 67 80 146.94006(3) 5.8(4) s (11/2-)
148Ho 67 81 147.93772(14) 2.2(11) s (1+)
148m1Ho 400(100)# keV 9.49(12) s (6)-
148m2Ho 690(100)# keV 2.35(4) ms (10+)
149Ho 67 82 148.933775(20) 21.1(2) s (11/2-)
149m1Ho 48.80(20) keV 56(3) s (1/2+)
149m2Ho 7200(350) keV >=100 ns
150Ho 67 83 149.933496(15) 76.8(18) s 2-
150m1Ho -10(50) keV 23.3(3) s (9)+
150m2Ho ~8000 keV 751 ns
151Ho 67 84 150.931688(13) 35.2(1) s 11/2(-)
151mHo 41.0(2) keV 47.2(10) s 1/2(+)
152Ho 67 85 151.931714(15) 161.8(3) s 2-
152m1Ho 160(1) keV 50.0(4) s 9+
152m2Ho 3019.59(19) keV 8.4(3) µs 19-
153Ho 67 86 152.930199(6) 2.01(3) min 11/2-
153m1Ho 68.7(3) keV 9.3(5) min 1/2+
153m2Ho 2772 keV 229(2) ns (31/2+)
154Ho 67 87 153.930602(9) 11.76(19) min 2-
154mHo 238(30) keV 3.10(14) min 8+
155Ho 67 88 154.929103(19) 48(1) min 5/2+
155mHo 141.97(11) keV 880(80) µs 11/2-
156Ho 67 89 155.92984(5) 56(1) min 4-
156m1Ho 100(50)# keV 7.8(3) min (9+)
156m2Ho 52.4(5) keV 9.5(15) s 1-
157Ho 67 90 156.928256(26) 12.6(2) min 7/2-
158Ho 67 91 157.928941(29) 11.3(4) min 5+
158m1Ho 67.200(10) keV 28(2) min 2-
158m2Ho 180(70)# keV 21.3(23) min (9+)
159Ho 67 92 158.927712(4) 33.05(11) min 7/2-
159mHo 205.91(5) keV 8.30(8) s 1/2+
160Ho 67 93 159.928729(16) 25.6(3) min 5+
160m1Ho 59.98(3) keV 5.02(5) h 2-
160m2Ho 197(16) keV 3 s (9+)
161Ho 67 94 160.927855(3) 2.48(5) h 7/2-
161mHo 211.16(3) keV 6.76(7) s 1/2+
162Ho 67 95 161.929096(4) 15.0(10) min 1+
162mHo 106(7) keV 67.0(7) min 6-
163Ho 67 96 162.9287339(27) 4570(25) a 7/2-
163mHo 297.88(7) keV 1.09(3) s 1/2+
164Ho 67 97 163.9302335(30) 29(1) min 1+
164mHo 139.77(8) keV 38.0(10) min [37.5(+15-5) min] 6-
165Ho 67 98 164.9303221(27) STABLE 7/2- 1.0000
166Ho 67 99 165.9322842(27) 26.83(2) h 0-
166m1Ho 5.985(18) keV 1.20(18)E+3 a (7)-
166m2Ho 190.9052(20) keV 185(15) µs 3+
167Ho 67 100 166.933133(6) 3.003(18) h 7/2-
167mHo 259.34(11) keV 6.0(10) µs 3/2+
168Ho 67 101 167.93552(3) 2.99(7) min 3+
168m1Ho 59(1) keV 132(4) s (6+)
168m2Ho 143.4(2) keV >4 µs (1)-
168m3Ho 192.6(2) keV 108(11) ns 1+
169Ho 67 102 168.936872(22) 4.72(10) min 7/2-
170Ho 67 103 169.93962(5) 2.76(5) min 6+#
170mHo 120(70) keV 43(2) s (1+)
171Ho 67 104 170.94147(64) 53(2) s 7/2-#
172Ho 67 105 171.94482(43)# 25(3) s
173Ho 67 106 172.94729(43)# 10# s 7/2-#
174Ho 67 107 173.95115(54)# 8# s
175Ho 67 108 174.95405(64)# 5# s 7/2-#

Notes

  • Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
  • Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References

  • Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
  • Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
  • Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
    • Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003).
    • National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
    • David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.


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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Isotopes_of_holmium". A list of authors is available in Wikipedia.
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