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)
	excitation energy
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.

Isotopes of iron	Isotopes of cobalt	Isotopes of nickel
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