ユウロピウムの同位体
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) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 130Eu | 63 | 67 | 129.96357(54)# | 1.1(5) ms [0.9(+5-3) ms] | 2+# |  |  |
| 131Eu | 63 | 68 | 130.95775(43)# | 17.8(19) ms | 3/2+ |  |  |
| 132Eu | 63 | 69 | 131.95437(43)# | 100# ms |  |  |  |
| 133Eu | 63 | 70 | 132.94924(32)# | 200# ms | 11/2-# |  |  |
| 134Eu | 63 | 71 | 133.94651(21)# | 0.5(2) s |  |  |  |
| 135Eu | 63 | 72 | 134.94182(32)# | 1.5(2) s | 11/2-# |  |  |
| 136Eu | 63 | 73 | 135.93960(21)# | 3.3(3) s | (7+) |  |  |
| 136mEu | 0(500)# keV | 0(500)# keV | 0(500)# keV | 3.8(3) s | (3+) |  |  |
| 137Eu | 63 | 74 | 136.93557(21)# | 8.4(5) s | 11/2-# |  |  |
| 138Eu | 63 | 75 | 137.93371(3) | 12.1(6) s | (6-) |  |  |
| 139Eu | 63 | 76 | 138.929792(14) | 17.9(6) s | (11/2)- |  |  |
| 140Eu | 63 | 77 | 139.92809(6) | 1.51(2) s | 1+ |  |  |
| 140mEu | 210(15) keV | 210(15) keV | 210(15) keV | 125(2) ms | 5-# |  |  |
| 141Eu | 63 | 78 | 140.924931(14) | 40.7(7) s | 5/2+ |  |  |
| 141mEu | 96.45(7) keV | 96.45(7) keV | 96.45(7) keV | 2.7(3) s | 11/2- |  |  |
| 142Eu | 63 | 79 | 141.92343(3) | 2.36(10) s | 1+ |  |  |
| 142mEu | 460(30) keV | 460(30) keV | 460(30) keV | 1.223(8) min | 8- |  |  |
| 143Eu | 63 | 80 | 142.920298(12) | 2.59(2) min | 5/2+ |  |  |
| 143mEu | 389.51(4) keV | 389.51(4) keV | 389.51(4) keV | 50.0(5) µs | 11/2- |  |  |
| 144Eu | 63 | 81 | 143.918817(12) | 10.2(1) s | 1+ |  |  |
| 144mEu | 1127.6(6) keV | 1127.6(6) keV | 1127.6(6) keV | 1.0(1) µs | (8-) |  |  |
| 145Eu | 63 | 82 | 144.916265(4) | 5.93(4) d | 5/2+ |  |  |
| 145mEu | 716.0(3) keV | 716.0(3) keV | 716.0(3) keV | 490 ns | 11/2- |  |  |
| 146Eu | 63 | 83 | 145.917206(7) | 4.61(3) d | 4- |  |  |
| 146mEu | 666.37(16) keV | 666.37(16) keV | 666.37(16) keV | 235(3) µs | 9+ |  |  |
| 147Eu | 63 | 84 | 146.916746(3) | 24.1(6) d | 5/2+ |  |  |
| 148Eu | 63 | 85 | 147.918086(11) | 54.5(5) d | 5- |  |  |
| 149Eu | 63 | 86 | 148.917931(5) | 93.1(4) d | 5/2+ |  |  |
| 150Eu | 63 | 87 | 149.919702(7) | 36.9(9) a | 5(-) |  |  |
| 150mEu | 42.1(5) keV | 42.1(5) keV | 42.1(5) keV | 12.8(1) h | 0- |  |  |
| 151Eu | 63 | 88 | 150.9198502(26) | 5×1018 a | 5/2+ | 0.4781(6) |  |
| 151mEu | 196.245(10) keV | 196.245(10) keV | 196.245(10) keV | 58.9(5) µs | 11/2- |  |  |
| 152Eu | 63 | 89 | 151.9217445(26) | 13.537(6) a | 3- |  |  |
| 152m1Eu | 45.5998(4) keV | 45.5998(4) keV | 45.5998(4) keV | 9.3116(13) h | 0- |  |  |
| 152m2Eu | 65.2969(4) keV | 65.2969(4) keV | 65.2969(4) keV | 0.94(8) µs | 1- |  |  |
| 152m3Eu | 78.2331(4) keV | 78.2331(4) keV | 78.2331(4) keV | 165(10) ns | 1+ |  |  |
| 152m4Eu | 89.8496(4) keV | 89.8496(4) keV | 89.8496(4) keV | 384(10) ns | 4+ |  |  |
| 152m5Eu | 147.86(10) keV | 147.86(10) keV | 147.86(10) keV | 96(1) min | 8- |  |  |
| 153Eu | 63 | 90 | 152.9212303(26) | STABLE | 5/2+ | 0.5219(6) |  |
| 154Eu | 63 | 91 | 153.9229792(26) | 8.593(4) a | 3- |  |  |
| 154m1Eu | 145.3(3) keV | 145.3(3) keV | 145.3(3) keV | 46.3(4) min | (8-) |  |  |
| 154m2Eu | 68.1702(4) keV | 68.1702(4) keV | 68.1702(4) keV | 2.2(1) µs | 2+ |  |  |
| 155Eu | 63 | 92 | 154.9228933(27) | 4.7611(13) a | 5/2+ |  |  |
| 156Eu | 63 | 93 | 155.924752(6) | 15.19(8) d | 0+ |  |  |
| 157Eu | 63 | 94 | 156.925424(6) | 15.18(3) h | 5/2+ |  |  |
| 158Eu | 63 | 95 | 157.92785(8) | 45.9(2) min | (1-) |  |  |
| 159Eu | 63 | 96 | 158.929089(8) | 18.1(1) min | 5/2+ |  |  |
| 160Eu | 63 | 97 | 159.93197(22)# | 38(4) s | 1(-) |  |  |
| 161Eu | 63 | 98 | 160.93368(32)# | 26(3) s | 5/2+# |  |  |
| 162Eu | 63 | 99 | 161.93704(32)# | 10.6(10) s |  |  |  |
| 163Eu | 63 | 100 | 162.93921(54)# | 6# s | 5/2+# |  |  |
| 164Eu | 63 | 101 | 163.94299(64)# | 2# s |  |  |  |
| 165Eu | 63 | 102 | 164.94572(75)# | 1# s | 5/2+# |  |  |
| 166Eu | 63 | 103 | 165.94997(86)# | 400# ms |  |  |  |
| 167Eu | 63 | 104 | 166.95321(86)# | 200# ms | 5/2+# |  |  |