Isotopes of cerium

Isotopes of cerium: Naturally occurring cerium (Ce) is composed of 4 stable isotopes: ¹³⁶Ce, ¹³⁸Ce, ¹⁴⁰Ce, and ¹⁴²Ce with ¹⁴⁰Ce being the most abundant (88.48% natural abundance); ¹³⁶Ce, ¹³⁸Ce, and ¹⁴²Ce are predicted to undergo double beta decay but this process has never been observed. 35 radioisotopes have been characterized with the most stable being 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 10 meta states.

The isotopes of cerium range in atomic weight from 119 u (¹¹⁹Ce) to 157 u (¹⁵⁷Ce).

Standard atomic mass: 140.116(1) u

Table

nuclide
symbol Z(p) N(n)
isotopic mass (u)
half-life decay
mode(s)^[1]^{[n 1]} daughter
isotope(s)^{[n 2]} nuclear
spin representative
isotopic
composition
(mole fraction) range of natural
variation
(mole fraction)

excitation energy

¹¹⁹Ce 58 61 118.95276(64)# 200# ms β⁺ ¹¹⁹La 5/2+#

¹²⁰Ce 58 62 119.94664(75)# 250# ms β⁺ ¹²⁰La 0+

¹²¹Ce 58 63 120.94342(54)# 1.1(1) s β⁺ ¹²¹La (5/2)(+#)

¹²²Ce 58 64 121.93791(43)# 2# s β⁺ ¹²²La 0+

β⁺, p ¹²¹Ba

¹²³Ce 58 65 122.93540(32)# 3.8(2) s β⁺ ¹²³La (5/2)(+#)

β⁺, p ¹²²Ba

¹²⁴Ce 58 66 123.93041(32)# 9.1(12) s β⁺ ¹²⁴La 0+

¹²⁵Ce 58 67 124.92844(21)# 9.3(3) s β⁺ ¹²⁵La (7/2-)

β⁺, p ¹²⁴Ba

¹²⁶Ce 58 68 125.92397(3) 51.0(3) s β⁺ ¹²⁶La 0+

¹²⁷Ce 58 69 126.92273(6) 29(2) s β⁺ ¹²⁷La 5/2+#

¹²⁸Ce 58 70 127.91891(3) 3.93(2) min β⁺ ¹²⁸La 0+

¹²⁹Ce 58 71 128.91810(3) 3.5(3) min β⁺ ¹²⁹La (5/2+)

¹³⁰Ce 58 72 129.91474(3) 22.9(5) min β⁺ ¹³⁰La 0+

^130mCe 2453.6(3) keV 100(8) ns (7-)

¹³¹Ce 58 73 130.91442(4) 10.2(3) min β⁺ ¹³¹La (7/2+)

^131mCe 61.8(1) keV 5.0(10) min β⁺ ¹³¹La (1/2+)

¹³²Ce 58 74 131.911460(22) 3.51(11) h β⁺ ¹³²La 0+

^132mCe 2340.8(5) keV 9.4(3) ms IT ¹³²Ce (8-)

¹³³Ce 58 75 132.911515(18) 97(4) min β⁺ ¹³³La 1/2+

^133mCe 37.1(8) keV 4.9(4) h β⁺ ¹³³La 9/2-

¹³⁴Ce 58 76 133.908925(22) 3.16(4) d EC ¹³⁴La 0+

¹³⁵Ce 58 77 134.909151(12) 17.7(3) h β⁺ ¹³⁵La 1/2(+)

^135mCe 445.8(2) keV 20(1) s IT ¹³⁵Ce (11/2-)

¹³⁶Ce 58 78 135.907172(14) Observationally Stable^{[n 3]} 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 β⁺ ¹³⁷La 3/2+

^137mCe 254.29(5) keV 34.4(3) h IT (99.22%) ¹³⁷Ce 11/2-

β⁺ (.779%) ¹³⁷La

¹³⁸Ce 58 80 137.905991(11) Observationally Stable^{[n 4]} 0+ 0.00251(2) 0.00251-0.00254

^138mCe 2129.17(12) keV 8.65(20) ms IT ¹³⁸Ce 7-

¹³⁹Ce 58 81 138.906653(8) 137.641(20) d EC ¹³⁹La 3/2+

^139mCe 754.24(8) keV 56.54(13) s IT ¹³⁹Ce 11/2-

¹⁴⁰Ce^{[n 5]} 58 82 139.9054387(26) Observationally Stable^{[n 6]} 0+ 0.88450(51) 0.88446-0.88449

^140mCe 2107.85(3) keV 7.3(15) µs 6+

¹⁴¹Ce^{[n 5]} 58 83 140.9082763(26) 32.508(13) d β^- ¹⁴¹Pr 7/2-

¹⁴²Ce^{[n 5]} 58 84 141.909244(3) Observationally Stable^{[n 7]} 0+ 0.11114(51) 0.11114-0.11114

¹⁴³Ce^{[n 5]} 58 85 142.912386(3) 33.039(6) h β^- ¹⁴³Pr 3/2-

¹⁴⁴Ce^{[n 5]} 58 86 143.913647(4) 284.91(5) d β^- ^144mPr 0+

¹⁴⁵Ce 58 87 144.91723(4) 3.01(6) min β^- ¹⁴⁵Pr (3/2-)

¹⁴⁶Ce 58 88 145.91876(7) 13.52(13) min β^- ¹⁴⁶Pr 0+

¹⁴⁷Ce 58 89 146.92267(3) 56.4(10) s β^- ¹⁴⁷Pr (5/2-)

¹⁴⁸Ce 58 90 147.92443(3) 56(1) s β^- ¹⁴⁸Pr 0+

¹⁴⁹Ce 58 91 148.9284(1) 5.3(2) s β^- ¹⁴⁹Pr (3/2-)#

¹⁵⁰Ce 58 92 149.93041(5) 4.0(6) s β^- ¹⁵⁰Pr 0+

¹⁵¹Ce 58 93 150.93398(11) 1.02(6) s β^- ¹⁵¹Pr 3/2-#

¹⁵²Ce 58 94 151.93654(21)# 1.4(2) s β^- ¹⁵²Pr 0+

¹⁵³Ce 58 95 152.94058(43)# 500# ms [>300 ns] β^- ¹⁵³Pr 3/2-#

¹⁵⁴Ce 58 96 153.94342(54)# 300# ms [>300 ns] β^- ¹⁵⁴Pr 0+

¹⁵⁵Ce 58 97 154.94804(64)# 200# ms [>300 ns] β^- ¹⁵⁵Pr 5/2-#

¹⁵⁶Ce 58 98 155.95126(64)# 150# ms β^- ¹⁵⁶Pr 0+

¹⁵⁷Ce 58 99 156.95634(75)# 50# ms β^- ¹⁵⁷Pr 7/2+#

^ Abbreviations:
EC: Electron capture
IT: Isomeric transition

^ Bold for stable isotopes

^ Theorized to undergo β⁺β⁺ decay to ¹³⁶Ba with a half-life over 38×10¹⁵ years

^ Theorized to undergo β⁺β⁺ decay to ¹³⁸Ba with a half-life over 150×10¹² years

^ ^a ^b ^c ^d ^e Fission product

^ Theoretically capable of spontaneous fission

^ Theorized to undergo β^-β^- decay to ¹⁴²Nd with a half-life over 50×10¹⁵ years

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

^ http://www.nucleonica.net/unc.aspx

Isotope masses from:

G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties". Nuclear Physics A 729: 3–128. Bibcode 2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001. http://www.nndc.bnl.gov/amdc/nubase/Nubase2003.pdf.

Isotopic compositions and standard atomic masses from:

J. R. de Laeter, J. K. Böhlke, P. De Bièvre, H. Hidaka, H. S. Peiser, K. J. R. Rosman and P. D. P. Taylor (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry 75 (6): 683–800. doi:10.1351/pac200375060683. http://www.iupac.org/publications/pac/75/6/0683/pdf/.

M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry 78 (11): 2051–2066. doi:10.1351/pac200678112051. http://iupac.org/publications/pac/78/11/2051/pdf/. Lay summary.

Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.

G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties". Nuclear Physics A 729: 3–128. Bibcode 2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001. http://www.nndc.bnl.gov/amdc/nubase/Nubase2003.pdf.

National Nuclear Data Center. "NuDat 2.1 database". Brookhaven National Laboratory. http://www.nndc.bnl.gov/nudat2/. Retrieved September 2005.

N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide. CRC Handbook of Chemistry and Physics (85th ed.). CRC Press. Section 11. ISBN 978-0849304859.

Isotopes of lanthanum Isotopes of cerium Isotopes of praseodymium

Index to isotope pages · Table of nuclides

Categories:
Cerium
Isotopes of cerium
Lists of isotopes by element

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)^[1]^{[n 1]}	daughter isotope(s)^{[n 2]}	nuclear spin
excitation energy
¹¹⁹Ce	58	61	118.95276(64)#	200# ms	β⁺	¹¹⁹La	5/2+#
¹²⁰Ce	58	62	119.94664(75)#	250# ms	β⁺	¹²⁰La	0+
¹²¹Ce	58	63	120.94342(54)#	1.1(1) s	β⁺	¹²¹La	(5/2)(+#)
¹²²Ce	58	64	121.93791(43)#	2# s	β⁺	¹²²La	0+
β⁺, p	¹²¹Ba
¹²³Ce	58	65	122.93540(32)#	3.8(2) s	β⁺	¹²³La	(5/2)(+#)
β⁺, p	¹²²Ba
¹²⁴Ce	58	66	123.93041(32)#	9.1(12) s	β⁺	¹²⁴La	0+
¹²⁵Ce	58	67	124.92844(21)#	9.3(3) s	β⁺	¹²⁵La	(7/2-)
β⁺, p	¹²⁴Ba
¹²⁶Ce	58	68	125.92397(3)	51.0(3) s	β⁺	¹²⁶La	0+
¹²⁷Ce	58	69	126.92273(6)	29(2) s	β⁺	¹²⁷La	5/2+#
¹²⁸Ce	58	70	127.91891(3)	3.93(2) min	β⁺	¹²⁸La	0+
¹²⁹Ce	58	71	128.91810(3)	3.5(3) min	β⁺	¹²⁹La	(5/2+)
¹³⁰Ce	58	72	129.91474(3)	22.9(5) min	β⁺	¹³⁰La	0+
^130mCe	2453.6(3) keV	100(8) ns			(7-)
¹³¹Ce	58	73	130.91442(4)	10.2(3) min	β⁺	¹³¹La	(7/2+)
^131mCe	61.8(1) keV	5.0(10) min	β⁺	¹³¹La	(1/2+)
¹³²Ce	58	74	131.911460(22)	3.51(11) h	β⁺	¹³²La	0+
^132mCe	2340.8(5) keV	9.4(3) ms	IT	¹³²Ce	(8-)
¹³³Ce	58	75	132.911515(18)	97(4) min	β⁺	¹³³La	1/2+
^133mCe	37.1(8) keV	4.9(4) h	β⁺	¹³³La	9/2-
¹³⁴Ce	58	76	133.908925(22)	3.16(4) d	EC	¹³⁴La	0+
¹³⁵Ce	58	77	134.909151(12)	17.7(3) h	β⁺	¹³⁵La	1/2(+)
^135mCe	445.8(2) keV	20(1) s	IT	¹³⁵Ce	(11/2-)
¹³⁶Ce	58	78	135.907172(14)	Observationally Stable^{[n 3]}	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	β⁺	¹³⁷La	3/2+
^137mCe	254.29(5) keV	34.4(3) h	IT (99.22%)	¹³⁷Ce	11/2-
β⁺ (.779%)	¹³⁷La
¹³⁸Ce	58	80	137.905991(11)	Observationally Stable^{[n 4]}	0+	0.00251(2)	0.00251-0.00254
^138mCe	2129.17(12) keV	8.65(20) ms	IT	¹³⁸Ce	7-
¹³⁹Ce	58	81	138.906653(8)	137.641(20) d	EC	¹³⁹La	3/2+
^139mCe	754.24(8) keV	56.54(13) s	IT	¹³⁹Ce	11/2-
¹⁴⁰Ce^{[n 5]}	58	82	139.9054387(26)	Observationally Stable^{[n 6]}	0+	0.88450(51)	0.88446-0.88449
^140mCe	2107.85(3) keV	7.3(15) µs			6+
¹⁴¹Ce^{[n 5]}	58	83	140.9082763(26)	32.508(13) d	β^-	¹⁴¹Pr	7/2-
¹⁴²Ce^{[n 5]}	58	84	141.909244(3)	Observationally Stable^{[n 7]}	0+	0.11114(51)	0.11114-0.11114
¹⁴³Ce^{[n 5]}	58	85	142.912386(3)	33.039(6) h	β^-	¹⁴³Pr	3/2-
¹⁴⁴Ce^{[n 5]}	58	86	143.913647(4)	284.91(5) d	β^-	^144mPr	0+
¹⁴⁵Ce	58	87	144.91723(4)	3.01(6) min	β^-	¹⁴⁵Pr	(3/2-)
¹⁴⁶Ce	58	88	145.91876(7)	13.52(13) min	β^-	¹⁴⁶Pr	0+
¹⁴⁷Ce	58	89	146.92267(3)	56.4(10) s	β^-	¹⁴⁷Pr	(5/2-)
¹⁴⁸Ce	58	90	147.92443(3)	56(1) s	β^-	¹⁴⁸Pr	0+
¹⁴⁹Ce	58	91	148.9284(1)	5.3(2) s	β^-	¹⁴⁹Pr	(3/2-)#
¹⁵⁰Ce	58	92	149.93041(5)	4.0(6) s	β^-	¹⁵⁰Pr	0+
¹⁵¹Ce	58	93	150.93398(11)	1.02(6) s	β^-	¹⁵¹Pr	3/2-#
¹⁵²Ce	58	94	151.93654(21)#	1.4(2) s	β^-	¹⁵²Pr	0+
¹⁵³Ce	58	95	152.94058(43)#	500# ms [>300 ns]	β^-	¹⁵³Pr	3/2-#
¹⁵⁴Ce	58	96	153.94342(54)#	300# ms [>300 ns]	β^-	¹⁵⁴Pr	0+
¹⁵⁵Ce	58	97	154.94804(64)#	200# ms [>300 ns]	β^-	¹⁵⁵Pr	5/2-#
¹⁵⁶Ce	58	98	155.95126(64)#	150# ms	β^-	¹⁵⁶Pr	0+
¹⁵⁷Ce	58	99	156.95634(75)#	50# ms	β^-	¹⁵⁷Pr	7/2+#

Isotopes of lanthanum	Isotopes of cerium	Isotopes of praseodymium
Index to isotope pages · Table of nuclides

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