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Isotopes of cerium

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Main isotopes^[1]			Decay
Isotope	abundance	half-life(t_1/2)	mode	product
¹³⁴Ce	synth	3.16 d	ε	¹³⁴La
¹³⁶Ce	0.186%	stable
¹³⁸Ce	0.251%	stable
¹³⁹Ce	synth	137.64 d	ε	¹³⁹La
¹⁴⁰Ce	88.4%	stable
¹⁴¹Ce	synth	32.505 d	β⁻	¹⁴¹Pr
¹⁴²Ce	11.1%	stable
¹⁴³Ce	synth	33.039 h	β⁻	¹⁴³Pr
¹⁴⁴Ce	synth	284.89 d	β⁻	¹⁴⁴Pr

Standard atomic weightA_r°(Ce)

140.116±0.001^[2]
140.12±0.01 (abridged)^[3]

Naturally occurringcerium (₅₈Ce) is composed of 4 stableisotopes:¹³⁶Ce,¹³⁸Ce,¹⁴⁰Ce, and¹⁴²Ce, with¹⁴⁰Ce being the most abundant (88.45%natural abundance) and the only one that is theoretically stable. The others,¹³⁶Ce,¹³⁸Ce, and¹⁴²Ce are predicted to undergodouble beta decay, which has never been observed. There are 35radioisotopes that have been characterized, with the most stable being¹⁴⁴Ce, with a half-life of 284.89 days;¹³⁹Ce, with a half-life of 137.64 days and¹⁴¹Ce, with a half-life of 32.505 days. All of the remainingradioactive isotopes have half-lives that are less than 4 days and the majority of these have half-lives that are less than 10 minutes.

The known isotopes of cerium range from¹²¹Ce to¹⁵⁷Ce, in addition to 14meta states.

List of isotopes

[edit]

Nuclide ^{[n 1]}	Z	N	Isotopic mass(Da)^[4] ^{[n 2]}^{[n 3]}	Half-life^[1] ^{[n 4]}	Decay mode^[1] ^{[n 5]}	Daughter isotope ^{[n 6]}	Spin and parity^[1] ^{[n 7]}^{[n 4]}	Natural abundance(mole fraction)
Nuclide ^{[n 1]}	Excitation energy			Half-life^[1] ^{[n 4]}	Decay mode^[1] ^{[n 5]}	Daughter isotope ^{[n 6]}	Spin and parity^[1] ^{[n 7]}^{[n 4]}	Normal proportion^[1]	Range of variation
¹²⁰Ce	58	62
¹²¹Ce	58	63	120.94344(43)#	1.1(1) s	β⁺ (99%)	¹²¹La	5/2(+#)
¹²¹Ce	58	63	120.94344(43)#	1.1(1) s	β⁺,p (1%)	¹²⁰Ba	5/2(+#)
¹²²Ce	58	64	121.93787(43)#	2# s	β⁺	¹²²La	0+
¹²³Ce	58	65	122.93528(32)#	3.8(2) s	β⁺ (?%)	¹²³La	(5/2)(+#)
¹²³Ce	58	65	122.93528(32)#	3.8(2) s	β⁺, p (?%)	¹²²Ba	(5/2)(+#)
¹²⁴Ce	58	66	123.93031(32)#	9.1(12) s	β⁺	¹²⁴La	0+
¹²⁵Ce	58	67	124.92844(21)#	9.7(3) s	β⁺ (?%)	¹²⁵La	(7/2−)
¹²⁵Ce	58	67	124.92844(21)#	9.7(3) s	β⁺, p (?%)	¹²⁴Ba	(7/2−)
^125mCe	93.6(4) keV			13(10) s	IT	¹²⁵Ce	(1/2+)
¹²⁶Ce	58	68	125.923971(30)	51.0(3) s	β⁺	¹²⁶La	0+
¹²⁷Ce	58	69	126.922727(31)	34(2) s	β⁺	¹²⁷La	(1/2+)
^127m1Ce	7.3(11) keV			28.6(7) s	β⁺	¹²⁷La	(5/2+)
^127m2Ce	36.9(11) keV			>10 μs	IT	¹²⁷Ce	(7/2−)
¹²⁸Ce	58	70	127.918911(30)	3.93(2) min	β⁺	¹²⁸La	0+
¹²⁹Ce	58	71	128.918102(30)	3.5(3) min	β⁺	¹²⁹La	(5/2+)
¹³⁰Ce	58	72	129.914736(30)	22.9(5) min	β⁺	¹³⁰La	0+
^130mCe	2453.6(3) keV			100(8) ns	IT	¹³⁰Ce	7−
¹³¹Ce	58	73	130.914429(35)	10.3(3) min	β⁺	¹³¹La	7/2+
^131mCe	63.09(9) keV			5.4(4) min	β⁺	¹³¹La	(1/2+)
¹³²Ce	58	74	131.911466(22)	3.51(11) h	β⁺	¹³²La	0+
^132mCe	2341.15(21) keV			9.4(3) ms	IT	¹³²Ce	8−
¹³³Ce	58	75	132.911520(18)	97(4) min	β⁺	¹³³La	1/2+
^133mCe	37.2(7) keV			5.1(3) h	β⁺	¹³³La	9/2−
¹³⁴Ce	58	76	133.908928(22)	3.16(4) d	EC	¹³⁴La	0+
^134mCe	3208.6(4) keV			308(5) ns	IT	¹³⁴Ce	10+
¹³⁵Ce	58	77	134.909161(11)	17.7(3) h	β⁺	¹³⁵La	1/2+
^135mCe	445.81(21) keV			20(1) s	IT	¹³⁵Ce	(11/2−)
¹³⁶Ce	58	78	135.90712926(35)	Observationally stable^{[n 8]}			0+	0.00186(2)
^136mCe	3095.0(6) keV			1.96(9) μs	IT	¹³⁶Ce	10+
¹³⁷Ce	58	79	136.90776242(39)	9.0(3) h	β⁺	¹³⁷La	3/2+
^137mCe	254.29(5) keV			34.4(3) h	IT (99.21%)	¹³⁷Ce	11/2−
^137mCe	254.29(5) keV			34.4(3) h	β⁺ (0.79%)	¹³⁷La	11/2−
¹³⁸Ce	58	80	137.90599418(54)	Observationally stable^{[n 9]}			0+	0.00251(2)
^138mCe	2129.28(12) keV			8.73(20) ms	IT	¹³⁸Ce	7-
¹³⁹Ce	58	81	138.9066470(22)	137.642(20) d	EC	¹³⁹La	3/2+
^139mCe	754.24(8) keV			57.58(32) s	IT	¹³⁹Ce	11/2−
¹⁴⁰Ce^{[n 10]}	58	82	139.9054484(14)	Stable			0+	0.88449(51)
^140mCe	2107.854(24) keV			7.3(15) μs	IT	¹⁴⁰Ce	6+
¹⁴¹Ce^{[n 10]}	58	83	140.9082860(14)	32.505(10) d	β⁻	¹⁴¹Pr	7/2−
¹⁴²Ce^{[n 10]}	58	84	141.9092502(26)	Observationally stable^{[n 11]}^[5]			0+	0.11114(51)
¹⁴³Ce^{[n 10]}	58	85	142.9123920(26)	33.039(6) h	β⁻	¹⁴³Pr	3/2−
¹⁴⁴Ce^{[n 10]}	58	86	143.9136528(30)	284.886(25) d	β⁻	¹⁴⁴Pr	0+
¹⁴⁵Ce	58	87	144.917265(36)	3.01(6) min	β⁻	¹⁴⁵Pr	5/2−#
¹⁴⁶Ce	58	88	145.918812(16)	13.49(16) min	β⁻	¹⁴⁶Pr	0+
¹⁴⁷Ce	58	89	146.9226899(92)	56.4(10) s	β⁻	¹⁴⁷Pr	(5/2−)
¹⁴⁸Ce	58	90	147.924424(12)	56.8(3) s	β⁻	¹⁴⁸Pr	0+
¹⁴⁹Ce	58	91	148.928427(11)	4.94(4) s	β⁻	¹⁴⁹Pr	3/2−#
¹⁵⁰Ce	58	92	149.930384(13)	6.05(7) s	β⁻	¹⁵⁰Pr	0+
¹⁵¹Ce	58	93	150.934272(19)	1.76(6) s	β⁻	¹⁵¹Pr	(3/2−)
¹⁵²Ce	58	94	151.93668(22)#	1.42(2) s	β⁻	¹⁵²Pr	0+
¹⁵³Ce	58	95	152.94105(22)#	865(25) ms	β⁻	¹⁵³Pr	3/2−#
¹⁵⁴Ce	58	96	153.94394(22)#	722(14) ms	β⁻	¹⁵⁴Pr	0+
¹⁵⁵Ce	58	97	154.94871(32)#	313(7) ms	β⁻	¹⁵⁵Pr	5/2−#
¹⁵⁶Ce	58	98	155.95188(32)#	233(9) ms	β⁻	¹⁵⁶Pr	0+
¹⁵⁷Ce	58	99	156.95713(43)#	175(41) ms	β⁻	¹⁵⁷Pr	7/2+#
¹⁵⁸Ce	58	100	157.96077(43)#	99(93) ms	β⁻	¹⁵⁸Pr	0+
This table header & footer: view

^^mCe – Excitednuclear isomer.
^( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
^# – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
^^a ^b# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
^Modes of decay:
EC: Electron capture

IT: Isomeric transition

p: Proton emission
^Bold symbol as daughter – Daughter product is stable.
^( ) spin value – Indicates spin with weak assignment arguments.
^Theorized to undergo β⁺β⁺ decay to¹³⁶Ba with ahalf-life over 3.2×10¹⁶ years
^Theorized to undergo β⁺β⁺ decay to¹³⁸Ba with a half-life over 4.4×10¹⁶ years
^^a ^b ^c ^d ^eFission product
^Theorized to undergo β⁻β⁻ decay to¹⁴²Nd or α decay to¹³⁸Ba with a half-life over 2.9×10¹⁸ years

References

[edit]

^^a ^b ^c ^d ^eKondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021)."The NUBASE2020 evaluation of nuclear properties"(PDF).Chinese Physics C.45 (3) 030001.doi:10.1088/1674-1137/abddae.
^"Standard Atomic Weights: Cerium".CIAAW. 1995.
^Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04)."Standard atomic weights of the elements 2021 (IUPAC Technical Report)".Pure and Applied Chemistry.doi:10.1515/pac-2019-0603.ISSN 1365-3075.
^Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*".Chinese Physics C.45 (3) 030003.doi:10.1088/1674-1137/abddaf.
^Belli, P.; Bernabei, R.; Danevich, F. A.; Incicchitti, A.; Tretyak, V. I. (2019). "Experimental searches for rare alpha and beta decays".European Physical Journal A.55 (140):4–6.arXiv:1908.11458.Bibcode:2019EPJA...55..140B.doi:10.1140/epja/i2019-12823-2.S2CID 254103706.

Isotopes of thechemical elements

Group	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
Period	Hydrogen and alkali metals	Alkaline earth metals													Pnictogens	Chalcogens	Halogens	Noble gases
①	Isotopes § List H 1																	Isotopes § List He 2
②	Isotopes § List Li 3	Isotopes § List Be 4											Isotopes § List B 5	Isotopes § List C 6	Isotopes § List N 7	Isotopes § List O 8	Isotopes § List F 9	Isotopes § List Ne 10
③	Isotopes § List Na 11	Isotopes § List Mg 12											Isotopes § List Al 13	Isotopes § List Si 14	Isotopes § List P 15	Isotopes § List S 16	Isotopes § List Cl 17	Isotopes § List Ar 18
④	Isotopes § List K 19	Isotopes § List Ca 20	Isotopes § List Sc 21	Isotopes § List Ti 22	Isotopes § List V 23	Isotopes § List Cr 24	Isotopes § List Mn 25	Isotopes § List Fe 26	Isotopes § List Co 27	Isotopes § List Ni 28	Isotopes § List Cu 29	Isotopes § List Zn 30	Isotopes § List Ga 31	Isotopes § List Ge 32	Isotopes § List As 33	Isotopes § List Se 34	Isotopes § List Br 35	Isotopes § List Kr 36
⑤	Isotopes § List Rb 37	Isotopes § List Sr 38	Isotopes § List Y 39	Isotopes § List Zr 40	Isotopes § List Nb 41	Isotopes § List Mo 42	Isotopes § List Tc 43	Isotopes § List Ru 44	Isotopes § List Rh 45	Isotopes § List Pd 46	Isotopes § List Ag 47	Isotopes § List Cd 48	Isotopes § List In 49	Isotopes § List Sn 50	Isotopes § List Sb 51	Isotopes § List Te 52	Isotopes § List I 53	Isotopes § List Xe 54
⑥	Isotopes § List Cs 55	Isotopes § List Ba 56	Isotopes § List Lu 71	Isotopes § List Hf 72	Isotopes § List Ta 73	Isotopes § List W 74	Isotopes § List Re 75	Isotopes § List Os 76	Isotopes § List Ir 77	Isotopes § List Pt 78	Isotopes § List Au 79	Isotopes § List Hg 80	Isotopes § List Tl 81	Isotopes § List Pb 82	Isotopes § List Bi 83	Isotopes § List Po 84	Isotopes § List At 85	Isotopes § List Rn 86
⑦	Isotopes § List Fr 87	Isotopes § List Ra 88	Isotopes § List Lr 103	Isotopes § List Rf 104	Isotopes § List Db 105	Isotopes § List Sg 106	Isotopes § List Bh 107	Isotopes § List Hs 108	Isotopes § List Mt 109	Isotopes § List Ds 110	Isotopes § List Rg 111	Isotopes § List Cn 112	Isotopes § List Nh 113	Isotopes § List Fl 114	Isotopes § List Mc 115	Isotopes § List Lv 116	Isotopes § List Ts 117	Isotopes § List Og 118
⑧	Isotopes § List Uue 119	Isotopes § List Ubn 120

			Isotopes § List La 57	Isotopes § List Ce 58	Isotopes § List Pr 59	Isotopes § List Nd 60	Isotopes § List Pm 61	Isotopes § List Sm 62	Isotopes § List Eu 63	Isotopes § List Gd 64	Isotopes § List Tb 65	Isotopes § List Dy 66	Isotopes § List Ho 67	Isotopes § List Er 68	Isotopes § List Tm 69	Isotopes § List Yb 70
			Isotopes § List Ac 89	Isotopes § List Th 90	Isotopes § List Pa 91	Isotopes § List U 92	Isotopes § List Np 93	Isotopes § List Pu 94	Isotopes § List Am 95	Isotopes § List Cm 96	Isotopes § List Bk 97	Isotopes § List Cf 98	Isotopes § List Es 99	Isotopes § List Fm 100	Isotopes § List Md 101	Isotopes § List No 102

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