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Isotopes of hafnium



Hafnium (Hf)
Standard atomic mass: 178.49(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
153Hf 72 81 152.97069(54)# 400# ms [>200 ns] 1/2+#
153mHf 750(100)# keV 500# ms 11/2-#
154Hf 72 82 153.96486(54)# 2(1) s 0+
155Hf 72 83 154.96339(43)# 890(120) ms 7/2-#
156Hf 72 84 155.95936(22) 23(1) ms 0+
156mHf 1959.0(10) keV 480(40) µs 8+
157Hf 72 85 156.95840(21)# 115(1) ms 7/2-
158Hf 72 86 157.954799(19) 2.84(7) s 0+
159Hf 72 87 158.953995(18) 5.20(10) s 7/2-#
160Hf 72 88 159.950684(12) 13.6(2) s 0+
161Hf 72 89 160.950275(24) 18.2(5) s 3/2-#
162Hf 72 90 161.94721(1) 39.4(9) s 0+
163Hf 72 91 162.94709(3) 40.0(6) s 3/2-#
164Hf 72 92 163.944367(22) 111(8) s 0+
165Hf 72 93 164.94457(3) 76(4) s (5/2-)
166Hf 72 94 165.94218(3) 6.77(30) min 0+
167Hf 72 95 166.94260(3) 2.05(5) min (5/2)-
168Hf 72 96 167.94057(3) 25.95(20) min 0+
169Hf 72 97 168.94126(3) 3.24(4) min (5/2)-
170Hf 72 98 169.93961(3) 16.01(13) h 0+
171Hf 72 99 170.94049(3) 12.1(4) h 7/2(+)
171mHf 21.93(9) keV 29.5(9) s 1/2(-)
172Hf 72 100 171.939448(26) 1.87(3) a 0+
172mHf 2005.58(11) keV 163(3) ns (8-)
173Hf 72 101 172.94051(3) 23.6(1) h 1/2-
174Hf 72 102 173.940046(3) 2.0(4)E+15 a 0+ 0.0016(1) 0.001619-0.001621
174m1Hf 1549.3 keV 138(4) ns (6+)
174m2Hf 1797.5(20) keV 2.39(4) µs (8-)
174m3Hf 1797.5 keV 2.39(4) µs (8-)
174m4Hf 3311.7 keV 3.7(2) µs (14+)
175Hf 72 103 174.941509(3) 70(2) d 5/2-
176Hf 72 104 175.9414086(24) STABLE 0+ 0.0526(7) 0.05206-0.05271
177Hf 72 105 176.9432207(23) STABLE 7/2- 0.1860(9) 0.18593-0.18606
177m1Hf 1315.4504(8) keV 1.09(5) s 23/2+
177m2Hf 1342.38(20) keV 55.9(12) µs (19/2-)
177m3Hf 2740.02(15) keV 51.4(5) min 37/2-
178Hf 72 106 177.9436988(23) STABLE 0+ 0.2728(7) 0.27278-0.27297
178m1Hf 1147.423(5) keV 4.0(2) s 8-
178m2Hf 2573.5(5) keV 68(2) µs (14-)
178m3Hf 2445.69(11) keV 31(1) a 16+
179Hf 72 107 178.9458161(23) STABLE 9/2+ 0.1362(2) 0.13619-0.1363
179m1Hf 375.0367(25) keV 18.67(4) s 1/2-
179m2Hf 1105.84(19) keV 25.05(25) d 25/2-
180Hf 72 108 179.9465500(23) STABLE 0+ 0.3508(16) 0.35076-0.351
180m1Hf 1141.48(4) keV 5.47(4) h 8-
180m2Hf 1374.15(4) keV 0.57(2) µs (4-)
180m3Hf 2425.8(10) keV 15(5) µs (10+)
180m4Hf 2486.3(9) keV 10(1) µs 12+
180m5Hf 2538.3(12) keV >10 µs (14+)
180m6Hf 3599.3(18) keV 90(10) µs (18-)
181Hf 72 109 180.9491012(23) 42.39(6) d 1/2-
181m1Hf 595(3) keV 80(5) µs (9/2+)
181m2Hf 1040(10) keV ~100 µs (17/2+)
181m3Hf 1738(10) keV 1.5(5) ms (27/2-)
182Hf 72 110 181.950554(7) 8.90(9)E+6 a 0+
182mHf 1172.88(18) keV 61.5(15) min 8-
183Hf 72 111 182.95353(3) 1.067(17) h (3/2-)
184Hf 72 112 183.95545(4) 4.12(5) h 0+
184mHf 1272.4(4) keV 48(10) s 8-
185Hf 72 113 184.95882(21)# 3.5(6) min 3/2-#
186Hf 72 114 185.96089(32)# 2.6(12) min 0+
187Hf 72 115 186.96459(43)# 30# s [>300 ns]
188Hf 72 116 187.96685(54)# 20# s [>300 ns] 0+

Notes

  • Evaluated isotopic composition is for most but not all commercial samples.
  • 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_hafnium". A list of authors is available in Wikipedia.
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