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Isotopes of curium

Curium (Cm) has no stable isotopes. A standard atomic mass cannot be given.

Curium has also been called eka-gadolinium and, erroneously, eka-platinum.

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)
²³²Cm	96	136		1? min	0+
²³³Cm	96	137	233.05077(8)	1# min	3/2+#
²³⁴Cm	96	138	234.05016(2)	51(12) s	0+
²³⁵Cm	96	139	235.05143(22)#	5# min	5/2+#
²³⁶Cm	96	140	236.05141(22)#	10# min	0+
²³⁷Cm	96	141	237.05290(22)#	20# min	5/2+#
²³⁸Cm	96	142	238.05303(4)	2.4(1) h	0+
²³⁹Cm	96	143	239.05496(11)#	~2.9 h	(7/2-)
²⁴⁰Cm	96	144	240.0555295(25)	27(1) d	0+
²⁴¹Cm	96	145	241.0576530(23)	32.8(2) d	1/2+
²⁴²Cm	96	146	242.0588358(20)	162.8(2) d	0+
²⁴³Cm	96	147	243.0613891(22)	29.1(1) a	5/2+
^243mCm	87.4(1) keV			1.08(3) µs	1/2+
²⁴⁴Cm	96	148	244.0627526(20)	18.10(2) a	0+
^244mCm	1040.188(12) keV			34(2) ms	6+
²⁴⁵Cm	96	149	245.0654912(22)	8.5(1)E+3 a	7/2+
^245mCm	355.90(10) keV			290(20) ns	1/2+
²⁴⁶Cm	96	150	246.0672237(22)	4.76(4)E+3 a	0+
²⁴⁷Cm	96	151	247.070354(5)	1.56(5)E+7 a	9/2-
²⁴⁸Cm	96	152	248.072349(5)	3.48(6)E+5 a	0+
²⁴⁹Cm	96	153	249.075953(5)	64.15(3) min	1/2(+)
^249mCm	48.758(17) keV			23 µs	(7/2+)
²⁵⁰Cm	96	154	250.078357(12)	8300# a	0+
²⁵¹Cm	96	155	251.082285(24)	16.8(2) min	(1/2+)
²⁵²Cm	96	156	252.08487(32)#	<1 d	0+

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.

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 americium	Isotopes of curium	Isotopes of berkelium
Index to isotope pages

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