Isotopes of curium

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

[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
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+

[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 americium	Isotopes of curium	Isotopes of berkelium
Index to isotope pages