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Isotopes of curium



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

Additional recommended knowledge

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)
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+

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.

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
 
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.
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