サマリウムの同位体
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) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 128Sm | 62 | 66 | 127.95808(54)# | 0.5# s | 0+ |  |  |
| 129Sm | 62 | 67 | 128.95464(54)# | 550(100) ms | 5/2+# |  |  |
| 130Sm | 62 | 68 | 129.94892(43)# | 1# s | 0+ |  |  |
| 131Sm | 62 | 69 | 130.94611(32)# | 1.2(2) s | 5/2+# |  |  |
| 132Sm | 62 | 70 | 131.94069(32)# | 4.0(3) s | 0+ |  |  |
| 133Sm | 62 | 71 | 132.93867(21)# | 2.90(17) s | (5/2+) |  |  |
| 134Sm | 62 | 72 | 133.93397(21)# | 10(1) s | 0+ |  |  |
| 135Sm | 62 | 73 | 134.93252(17) | 10.3(5) s | (7/2+) |  |  |
| 135mSm | 0(300)# keV | 0(300)# keV | 0(300)# keV | 2.4(9) s | (3/2+,5/2+) |  |  |
| 136Sm | 62 | 74 | 135.928276(13) | 47(2) s | 0+ |  |  |
| 136mSm | 2264.7(11) keV | 2264.7(11) keV | 2264.7(11) keV | 15(1) µs | (8-) |  |  |
| 137Sm | 62 | 75 | 136.92697(5) | 45(1) s | (9/2-) |  |  |
| 137mSm | 180(50)# keV | 180(50)# keV | 180(50)# keV | 20# s | 1/2+# |  |  |
| 138Sm | 62 | 76 | 137.923244(13) | 3.1(2) min | 0+ |  |  |
| 139Sm | 62 | 77 | 138.922297(12) | 2.57(10) min | 1/2+ |  |  |
| 139mSm | 457.40(22) keV | 457.40(22) keV | 457.40(22) keV | 10.7(6) s | 11/2- |  |  |
| 140Sm | 62 | 78 | 139.918995(13) | 14.82(12) min | 0+ |  |  |
| 141Sm | 62 | 79 | 140.918476(9) | 10.2(2) min | 1/2+ |  |  |
| 141mSm | 176.0(3) keV | 176.0(3) keV | 176.0(3) keV | 22.6(2) min | 11/2- |  |  |
| 142Sm | 62 | 80 | 141.915198(6) | 72.49(5) min | 0+ |  |  |
| 143Sm | 62 | 81 | 142.914628(4) | 8.75(8) min | 3/2+ |  |  |
| 143m1Sm | 753.99(16) keV | 753.99(16) keV | 753.99(16) keV | 66(2) s | 11/2- |  |  |
| 143m2Sm | 2793.8(13) keV | 2793.8(13) keV | 2793.8(13) keV | 30(3) ms | 23/2(-) |  |  |
| 144Sm | 62 | 82 | 143.911999(3) | STABLE | 0+ | 0.0307(7) |  |
| 144mSm | 2323.60(8) keV | 2323.60(8) keV | 2323.60(8) keV | 880(25) ns | 6+ |  |  |
| 145Sm | 62 | 83 | 144.913410(3) | 340(3) d | 7/2- |  |  |
| 145mSm | 8786.2(7) keV | 8786.2(7) keV | 8786.2(7) keV | 990(170) ns [0.96(+19-15) µs] | (49/2+) |  |  |
| 146Sm | 62 | 84 | 145.913041(4) | 1.03(5)E+8 a | 0+ |  |  |
| 147Sm | 62 | 85 | 146.9148979(26) | 1.06(2)E+11 a | 7/2- | 0.1499(18) |  |
| 148Sm | 62 | 86 | 147.9148227(26) | 7(3)E+15 a | 0+ | 0.1124(10) |  |
| 149Sm | 62 | 87 | 148.9171847(26) | STABLE [>2E+15 a] | 7/2- | 0.1382(7) |  |
| 150Sm | 62 | 88 | 149.9172755(26) | STABLE | 0+ | 0.0738(1) |  |
| 151Sm | 62 | 89 | 150.9199324(26) | 90(8) a | 5/2- |  |  |
| 151mSm | 261.13(4) keV | 261.13(4) keV | 261.13(4) keV | 1.4(1) µs | (11/2)- |  |  |
| 152Sm | 62 | 90 | 151.9197324(27) | STABLE | 0+ | 0.2675(16) |  |
| 153Sm | 62 | 91 | 152.9220974(27) | 46.284(4) h | 3/2+ |  |  |
| 153mSm | 98.37(10) keV | 98.37(10) keV | 98.37(10) keV | 10.6(3) ms | 11/2- |  |  |
| 154Sm | 62 | 92 | 153.9222093(27) | STABLE [>2.3E+18 a] | 0+ | 0.2275(29) |  |
| 155Sm | 62 | 93 | 154.9246402(28) | 22.3(2) min | 3/2- |  |  |
| 156Sm | 62 | 94 | 155.925528(10) | 9.4(2) h | 0+ |  |  |
| 156mSm | 1397.55(9) keV | 1397.55(9) keV | 1397.55(9) keV | 185(7) ns | 5- |  |  |
| 157Sm | 62 | 95 | 156.92836(5) | 8.03(7) min | (3/2-) |  |  |
| 158Sm | 62 | 96 | 157.92999(8) | 5.30(3) min | 0+ |  |  |
| 159Sm | 62 | 97 | 158.93321(11) | 11.37(15) s | 5/2- |  |  |
| 160Sm | 62 | 98 | 159.93514(21)# | 9.6(3) s | 0+ |  |  |
| 161Sm | 62 | 99 | 160.93883(32)# | 4.8(8) s | 7/2+# |  |  |
| 162Sm | 62 | 100 | 161.94122(54)# | 2.4(5) s | 0+ |  |  |
| 163Sm | 62 | 101 | 162.94536(75)# | 1# s | 1/2-# |  |  |
| 164Sm | 62 | 102 | 163.94828(86)# | 500# ms | 0+ |  |  |
| 165Sm | 62 | 103 | 164.95298(97)# | 200# ms | 5/2-# |  |  |