セリウムの同位体
一覧

| 同位体核種 | Z(p)> 励起エネルギー | N(n)> 励起エネルギー | 同位体質量 (u)> 励起エネルギー | 半減期 | 核スピン数 | 天然存在比 | 天然存在比 (範囲) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 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 | 2453.6(3) keV | 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 | 61.8(1) keV | 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 | 2340.8(5) keV | 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 | 37.1(8) keV | 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 | 445.8(2) keV | 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 | 3095.5(4) keV | 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 | 254.29(5) keV | 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 | 2129.17(12) keV | 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 | 754.24(8) keV | 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 | 2107.85(3) keV | 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+# |  |  |