Isotopes of cobalt

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Although cobalt (Co) has multiple isotopes, only one of these isotopes is stable; as such, it is considered a monoisotopic element.
Standard atomic mass: 58.933195(5) 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)
⁴⁷Co	27	20	47.01149(54)#		7/2-#
⁴⁸Co	27	21	48.00176(43)#		6+#
⁴⁹Co	27	22	48.98972(28)#	<35 ns	7/2-#
⁵⁰Co	27	23	49.98154(18)#	44(4) ms	(6+)
⁵¹Co	27	24	50.97072(16)#	60# ms [>200 ns]	7/2-#
⁵²Co	27	25	51.96359(7)#	115(23) ms	(6+)
^52mCo	380(100)# keV			104(11)# ms	2+#
⁵³Co	27	26	52.954219(19)	242(8) ms	7/2-#
^53mCo	3197(29) keV			247(12) ms	(19/2-)
⁵⁴Co	27	27	53.9484596(8)	193.28(7) ms	0+
^54mCo	197.4(5) keV			1.48(2) min	(7)+
⁵⁵Co	27	28	54.9419990(8)	17.53(3) h	7/2-
⁵⁶Co	27	29	55.9398393(23)	77.233(27) d	4+
⁵⁷Co	27	30	56.9362914(8)	271.74(6) d	7/2-
⁵⁸Co	27	31	57.9357528(13)	70.86(6) d	2+
^58m1Co	24.95(6) keV			9.04(11) h	5+
^58m2Co	53.15(7) keV			10.4(3) µs	4+
⁵⁹Co	27	32	58.9331950(7)	STABLE	7/2-	1.0000
⁶⁰Co	27	33	59.9338171(7)	5.2713(8) a	5+
^60mCo	58.59(1) keV			10.467(6) min	2+
⁶¹Co	27	34	60.9324758(10)	1.650(5) h	7/2-
⁶²Co	27	35	61.934051(21)	1.50(4) min	2+
^62mCo	22(5) keV			13.91(5) min	5+
⁶³Co	27	36	62.933612(21)	26.9(4) s	7/2-
⁶⁴Co	27	37	63.935810(21)	0.30(3) s	1+
⁶⁵Co	27	38	64.936478(14)	1.20(6) s	(7/2)-
⁶⁶Co	27	39	65.93976(27)	0.18(1) s	(3+)
^66m1Co	175(3) keV			1.21(1) µs	(5+)
^66m2Co	642(5) keV			>100 µs	(8-)
⁶⁷Co	27	40	66.94089(34)	0.425(20) s	(7/2-)#
⁶⁸Co	27	41	67.94487(34)	0.199(21) s	(7-)
^68mCo	150(150)# keV			1.6(3) s	(3+)
⁶⁹Co	27	42	68.94632(36)	227(13) ms	7/2-#
⁷⁰Co	27	43	69.9510(9)	119(6) ms	(6-)
^70mCo	200(200)# keV			500(180) ms	(3+)
⁷¹Co	27	44	70.9529(9)	97(2) ms	7/2-#
⁷²Co	27	45	71.95781(64)#	62(3) ms	(6-,7-)
⁷³Co	27	46	72.96024(75)#	41(4) ms	7/2-#
⁷⁴Co	27	47	73.96538(86)#	50# ms [>300 ns]	0+
⁷⁵Co	27	48	74.96833(86)#	40# ms [>300 ns]	7/2-#

[edit] 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.

[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.