Isotopes of hafnium

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Hafnium (Hf)
Standard atomic mass: 178.49(2) u

[edit] 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)
nuclide symbol	excitation energy			half-life	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
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+

[edit] 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.

[edit] 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.