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Isotopes of cerium



Naturally occurring Cerium (Ce) is composed of 3 stable isotopes and 1 radioactive isotope; 136Ce, 138Ce, 140Ce, and 142Ce with 140Ce being the most abundant (88.48% natural abundance). 27 radioisotopes have been characterized with the most {abundant and/or stable} being 142Ce with a half-life of greater than 5×1016 years, 144Ce with a half-life of 284.893 days, 139Ce with a half-life of 137.640 days, and 141Ce with a half-life of 32.501 days. All of the remaining radioactive isotopes have half-lives that are less than 4 days and the majority of these have half-lives that are less than 10 minutes. This element also has 2 meta states.

Additional recommended knowledge

The isotopes of cerium range in atomic weight from 123 u (123Ce) to 152 u (152Ce).


Standard atomic mass: 140.116(1) u

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
119Ce 58 61 118.95276(64)# 200# ms 5/2+#
120Ce 58 62 119.94664(75)# 250# ms 0+
121Ce 58 63 120.94342(54)# 1.1(1) s (5/2)(+#)
122Ce 58 64 121.93791(43)# 2# s 0+
123Ce 58 65 122.93540(32)# 3.8(2) s (5/2)(+#)
124Ce 58 66 123.93041(32)# 9.1(12) s 0+
125Ce 58 67 124.92844(21)# 9.3(3) s (7/2-)
126Ce 58 68 125.92397(3) 51.0(3) s 0+
127Ce 58 69 126.92273(6) 29(2) s 5/2+#
128Ce 58 70 127.91891(3) 3.93(2) min 0+
129Ce 58 71 128.91810(3) 3.5(3) min (5/2+)
130Ce 58 72 129.91474(3) 22.9(5) min 0+
130mCe 2453.6(3) keV 100(8) ns (7-)
131Ce 58 73 130.91442(4) 10.2(3) min (7/2+)
131mCe 61.8(1) keV 5.0(10) min (1/2+)
132Ce 58 74 131.911460(22) 3.51(11) h 0+
132mCe 2340.8(5) keV 9.4(3) ms (8-)
133Ce 58 75 132.911515(18) 97(4) min 1/2+
133mCe 37.1(8) keV 4.9(4) h 9/2-
134Ce 58 76 133.908925(22) 3.16(4) d 0+
135Ce 58 77 134.909151(12) 17.7(3) h 1/2(+)
135mCe 445.8(2) keV 20(1) s (11/2-)
136Ce 58 78 135.907172(14) STABLE [>38E+15 a] 0+ 0.00185(2) 0.00185-0.00186
136mCe 3095.5(4) keV 2.2(2) µs 10+
137Ce 58 79 136.907806(14) 9.0(3) h 3/2+
137mCe 254.29(5) keV 34.4(3) h 11/2-
138Ce 58 80 137.905991(11) STABLE [>150E+12 a] 0+ 0.00251(2) 0.00251-0.00254
138mCe 2129.17(12) keV 8.65(20) ms 7-
139Ce 58 81 138.906653(8) 137.641(20) d 3/2+
139mCe 754.24(8) keV 56.54(13) s 11/2-
140Ce 58 82 139.9054387(26) STABLE 0+ 0.88450(51) 0.88446-0.88449
140mCe 2107.85(3) keV 7.3(15) µs 6+
141Ce 58 83 140.9082763(26) 32.508(13) d 7/2-
142Ce 58 84 141.909244(3) STABLE [>50E+15 a] 0+ 0.11114(51) 0.11114-0.11114
143Ce 58 85 142.912386(3) 33.039(6) h 3/2-
144Ce 58 86 143.913647(4) 284.91(5) d 0+
145Ce 58 87 144.91723(4) 3.01(6) min (3/2-)
146Ce 58 88 145.91876(7) 13.52(13) min 0+
147Ce 58 89 146.92267(3) 56.4(10) s (5/2-)
148Ce 58 90 147.92443(3) 56(1) s 0+
149Ce 58 91 148.9284(1) 5.3(2) s (3/2-)#
150Ce 58 92 149.93041(5) 4.0(6) s 0+
151Ce 58 93 150.93398(11) 1.02(6) s 3/2-#
152Ce 58 94 151.93654(21)# 1.4(2) s 0+
153Ce 58 95 152.94058(43)# 500# ms [>300 ns] 3/2-#
154Ce 58 96 153.94342(54)# 300# ms [>300 ns] 0+
155Ce 58 97 154.94804(64)# 200# ms [>300 ns] 5/2-#
156Ce 58 98 155.95126(64)# 150# ms 0+
157Ce 58 99 156.95634(75)# 50# ms 7/2+#

Notes

  • Evaluated isotopic composition is for most but not all commercial samples.
  • Geologically exceptional samples are known in which the isotopic composition lies outside the reported range. The uncertainty in the atomic mass may exceed the stated value for such specimens.
  • 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 lanthanum Isotopes of cerium Isotopes of praseodymium
Index to isotope pages
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Isotopes_of_cerium". A list of authors is available in Wikipedia.
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