Isotopes of cerium

Naturally occurring cerium (58Ce) is composed of 4 stable isotopes: 136Ce, 138Ce, 140Ce, and 142Ce, with 140Ce being the most abundant (88.48% natural abundance) and the only one theoretically stable; 136Ce, 138Ce, and 142Ce are predicted to undergo double beta decay but this process has never been observed. There are 35 radioisotopes that 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).

List of isotopes

 * 119Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 61
 * 118.95276(64)#
 * 200# ms
 * β+
 * 119La
 * 5/2+#
 * 120Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 62
 * 119.94664(75)#
 * 250# ms
 * β+
 * 120La
 * 0+
 * 121Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 63
 * 120.94342(54)#
 * 1.1(1) s
 * β+
 * 121La
 * (5/2)(+#)
 * rowspan=2|122Ce
 * rowspan=2 style="text-align:right" | 58
 * rowspan=2 style="text-align:right" | 64
 * rowspan=2|121.93791(43)#
 * rowspan=2|2# s
 * β+
 * 122La
 * rowspan=2|0+
 * rowspan=2|
 * rowspan=2|
 * β+, p
 * 121Ba
 * rowspan=2|123Ce
 * rowspan=2 style="text-align:right" | 58
 * rowspan=2 style="text-align:right" | 65
 * rowspan=2|122.93540(32)#
 * rowspan=2|3.8(2) s
 * β+
 * 123La
 * rowspan=2|(5/2)(+#)
 * rowspan=2|
 * rowspan=2|
 * β+, p
 * 122Ba
 * 124Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 66
 * 123.93041(32)#
 * 9.1(12) s
 * β+
 * 124La
 * 0+
 * rowspan=2|125Ce
 * rowspan=2 style="text-align:right" | 58
 * rowspan=2 style="text-align:right" | 67
 * rowspan=2|124.92844(21)#
 * rowspan=2|9.3(3) s
 * β+
 * 125La
 * rowspan=2|(7/2−)
 * rowspan=2|
 * rowspan=2|
 * β+, p
 * 124Ba
 * 126Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 68
 * 125.92397(3)
 * 51.0(3) s
 * β+
 * 126La
 * 0+
 * 127Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 69
 * 126.92273(6)
 * 29(2) s
 * β+
 * 127La
 * 5/2+#
 * 128Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 70
 * 127.91891(3)
 * 3.93(2) min
 * β+
 * 128La
 * 0+
 * 129Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 71
 * 128.91810(3)
 * 3.5(3) min
 * β+
 * 129La
 * (5/2+)
 * 130Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 72
 * 129.91474(3)
 * 22.9(5) min
 * β+
 * 130La
 * 0+
 * style="text-indent:1em" | 130mCe
 * colspan="3" style="text-indent:2em" | 2453.6(3) keV
 * 100(8) ns
 * (7−)
 * 131Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 73
 * 130.91442(4)
 * 10.2(3) min
 * β+
 * 131La
 * (7/2+)
 * style="text-indent:1em" | 131mCe
 * colspan="3" style="text-indent:2em" | 61.8(1) keV
 * 5.0(10) min
 * β+
 * 131La
 * (1/2+)
 * 132Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 74
 * 131.911460(22)
 * 3.51(11) h
 * β+
 * 132La
 * 0+
 * style="text-indent:1em" | 132mCe
 * colspan="3" style="text-indent:2em" | 2340.8(5) keV
 * 9.4(3) ms
 * IT
 * 132Ce
 * (8−)
 * 133Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 75
 * 132.911515(18)
 * 97(4) min
 * β+
 * 133La
 * 1/2+
 * style="text-indent:1em" | 133mCe
 * colspan="3" style="text-indent:2em" | 37.1(8) keV
 * 4.9(4) d
 * β+
 * 133La
 * 9/2−
 * 134Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 76
 * 133.908925(22)
 * 3.16(4) d
 * EC
 * 134La
 * 0+
 * 135Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 77
 * 134.909151(12)
 * 17.7(3) h
 * β+
 * 135La
 * 1/2(+)
 * style="text-indent:1em" | 135mCe
 * colspan="3" style="text-indent:2em" | 445.8(2) keV
 * 20(1) s
 * IT
 * 135Ce
 * (11/2−)
 * 136Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 78
 * 135.907172(14)
 * colspan=3 align=center|Observationally Stable
 * 0+
 * 0.00185(2)
 * 0.00185–0.00186
 * style="text-indent:1em" | 136mCe
 * colspan="3" style="text-indent:2em" | 3095.5(4) keV
 * 2.2(2) μs
 * 10+
 * 137Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 79
 * 136.907806(14)
 * 9.0(3) h
 * β+
 * 137La
 * 3/2+
 * rowspan=2 style="text-indent:1em" | 137mCe
 * rowspan=2 colspan="3" style="text-indent:2em" | 254.29(5) keV
 * rowspan=2|34.4(3) h
 * IT (99.22%)
 * 137Ce
 * rowspan=2|11/2−
 * rowspan=2|
 * rowspan=2|
 * β+ (.779%)
 * 137La
 * 138Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 80
 * 137.905991(11)
 * colspan=3 align=center|Observationally Stable
 * 0+
 * 0.00251(2)
 * 0.00251–0.00254
 * style="text-indent:1em" | 138mCe
 * colspan="3" style="text-indent:2em" | 2129.17(12) keV
 * 8.65(20) ms
 * IT
 * 138Ce
 * 7-
 * 139Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 81
 * 138.906653(8)
 * 137.641(20) d
 * EC
 * 139La
 * 3/2+
 * style="text-indent:1em" | 139mCe
 * colspan="3" style="text-indent:2em" | 754.24(8) keV
 * 56.54(13) s
 * IT
 * 139Ce
 * 11/2−
 * 140Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 82
 * 139.9054387(26)
 * colspan=3 align=center|Stable
 * 0+
 * 0.88450(51)
 * 0.88446–0.88449
 * style="text-indent:1em" | 140mCe
 * colspan="3" style="text-indent:2em" | 2107.85(3) keV
 * 7.3(15) μs
 * 6+
 * 141Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 83
 * 140.9082763(26)
 * 32.508(13) d
 * β−
 * 141Pr
 * 7/2−
 * 142Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 84
 * 141.909244(3)
 * colspan=3 align=center|Observationally Stable
 * 0+
 * 0.11114(51)
 * 0.11114–0.11114
 * 143Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 85
 * 142.912386(3)
 * 33.039(6) h
 * β−
 * 143Pr
 * 3/2−
 * 144Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 86
 * 143.913647(4)
 * 284.91(5) d
 * β−
 * 144mPr
 * 0+
 * 145Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 87
 * 144.91723(4)
 * 3.01(6) min
 * β−
 * 145Pr
 * (3/2−)
 * 146Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 88
 * 145.91876(7)
 * 13.52(13) min
 * β−
 * 146Pr
 * 0+
 * 147Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 89
 * 146.92267(3)
 * 56.4(10) s
 * β−
 * 147Pr
 * (5/2−)
 * 148Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 90
 * 147.92443(3)
 * 56(1) s
 * β−
 * 148Pr
 * 0+
 * 149Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 91
 * 148.9284(1)
 * 5.3(2) s
 * β−
 * 149Pr
 * (3/2−)#
 * 150Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 92
 * 149.93041(5)
 * 4.0(6) s
 * β−
 * 150Pr
 * 0+
 * 151Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 93
 * 150.93398(11)
 * 1.02(6) s
 * β−
 * 151Pr
 * 3/2−#
 * 152Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 94
 * 151.93654(21)#
 * 1.4(2) s
 * β−
 * 152Pr
 * 0+
 * 153Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 95
 * 152.94058(43)#
 * 500# ms [>300 ns]
 * β−
 * 153Pr
 * 3/2−#
 * 154Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 96
 * 153.94342(54)#
 * 300# ms [>300 ns]
 * β−
 * 154Pr
 * 0+
 * 155Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 97
 * 154.94804(64)#
 * 200# ms [>300 ns]
 * β−
 * 155Pr
 * 5/2−#
 * 156Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 98
 * 155.95126(64)#
 * 150# ms
 * β−
 * 156Pr
 * 0+
 * 157Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 99
 * 156.95634(75)#
 * 50# ms
 * β−
 * 157Pr
 * 7/2+#
 * style="text-align:right" | 58
 * style="text-align:right" | 87
 * 144.91723(4)
 * 3.01(6) min
 * β−
 * 145Pr
 * (3/2−)
 * 146Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 88
 * 145.91876(7)
 * 13.52(13) min
 * β−
 * 146Pr
 * 0+
 * 147Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 89
 * 146.92267(3)
 * 56.4(10) s
 * β−
 * 147Pr
 * (5/2−)
 * 148Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 90
 * 147.92443(3)
 * 56(1) s
 * β−
 * 148Pr
 * 0+
 * 149Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 91
 * 148.9284(1)
 * 5.3(2) s
 * β−
 * 149Pr
 * (3/2−)#
 * 150Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 92
 * 149.93041(5)
 * 4.0(6) s
 * β−
 * 150Pr
 * 0+
 * 151Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 93
 * 150.93398(11)
 * 1.02(6) s
 * β−
 * 151Pr
 * 3/2−#
 * 152Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 94
 * 151.93654(21)#
 * 1.4(2) s
 * β−
 * 152Pr
 * 0+
 * 153Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 95
 * 152.94058(43)#
 * 500# ms [>300 ns]
 * β−
 * 153Pr
 * 3/2−#
 * 154Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 96
 * 153.94342(54)#
 * 300# ms [>300 ns]
 * β−
 * 154Pr
 * 0+
 * 155Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 97
 * 154.94804(64)#
 * 200# ms [>300 ns]
 * β−
 * 155Pr
 * 5/2−#
 * 156Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 98
 * 155.95126(64)#
 * 150# ms
 * β−
 * 156Pr
 * 0+
 * 157Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 99
 * 156.95634(75)#
 * 50# ms
 * β−
 * 157Pr
 * 7/2+#
 * β−
 * 154Pr
 * 0+
 * 155Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 97
 * 154.94804(64)#
 * 200# ms [>300 ns]
 * β−
 * 155Pr
 * 5/2−#
 * 156Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 98
 * 155.95126(64)#
 * 150# ms
 * β−
 * 156Pr
 * 0+
 * 157Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 99
 * 156.95634(75)#
 * 50# ms
 * β−
 * 157Pr
 * 7/2+#
 * 157Ce
 * style="text-align:right" | 58
 * style="text-align:right" | 99
 * 156.95634(75)#
 * 50# ms
 * β−
 * 157Pr
 * 7/2+#
 * 7/2+#