# Isotopen van europium

Het chemisch element europium (Eu), met een atoommassa van 151,964(1) u, bezit 2 stabiele isotopen: $^{151}$Eu en $^{153}$Eu, waarvan de laatste het meest abundant is (ongeveer 52,2%). In 2007 werd echter ontdekt dat $^{151}$Eu een radio-isotoop is, maar aangezien de halfwaardetijd (5 triljoen jaar) dermate lang is, kan de isotoop als stabiel beschouwd worden. De overige 35 radio-isotopen zijn onstabiel en hebben een relatief korte halfwaardetijd (de meeste minder dan een seconde).
De kortstlevende isotoop van europium is $^{130}$Eu, met een halfwaardetijd van ongeveer 1,1 milliseconden. De langstlevende is $^{151}$Eu, met een halfwaardetijd van 5 triljoen jaar.

## Overzicht

| Nuclide | Z (p) | N (n) | Isotopische massa (u) | Halveringstijd | Radioactief verval | VP | Kernspin | Isotopische verhouding (molfractie) |
| Natuurlijk voorkomen (molfractie) |||
| $^{130}$Eu | 63 | 67 | 129,96357(54) | 1,1(5) ms | | | 2$^+$ | |
| $^{131}$Eu | 63 | 68 | 130,95775(43) | 17,8(19) ms | | | 3/2$^+$ | |
| $^{132}$Eu | 63 | 69 | 131,95437(43) | 100 ms | β$^+$ | $^{132}$Sm | | |
| $^{132}$Eu | 63 | 69 | 131,95437(43) | 100 ms | p | $^{131}$Sm | | |
| $^{133}$Eu | 63 | 70 | 132,94924(32) | 200 ms | β$^+$ | $^{133}$Sm | 11/2$^−$ | |
| $^{134}$Eu | 63 | 71 | 133,94651(21) | 0,5(2) s | β$^+$ | $^{134}$Sm | | |
| $^{134}$Eu | 63 | 71 | 133,94651(21) | 0,5(2) s | β$^+$, p (zelden) | $^{133}$Pm | | |
| $^{135}$Eu | 63 | 72 | 134,94182(32) | 1,5(2) s | β$^+$ | $^{135}$Sm | 11/2$^−$ | |
| $^{135}$Eu | 63 | 72 | 134,94182(32) | 1,5(2) s | β$^+$, p | $^{134}$Pm | 11/2$^−$ | |
| $^{136}$Eu | 63 | 73 | 135,93960(21) | 3,3(3) s | β$^+$ (99,91%) | $^{136}$Sm | (7$^+$) | |
| $^{136}$Eu | 63 | 73 | 135,93960(21) | 3,3(3) s | β$^+$, p (0,09%) | $^{135}$Pm | (7$^+$) | |
| $^{136m}$Eu | 0(500) keV | 0(500) keV | 0(500) keV | 3,8(3) s | β$^+$ (99,91%) | $^{136}$Sm | (3$^+$) | |
| $^{136m}$Eu | 0(500) keV | 0(500) keV | 0(500) keV | 3,8(3) s | β$^+$, p (0,09%) | $^{135}$Pm | (3$^+$) | |
| $^{137}$Eu | 63 | 74 | 136,93557(21) | 8,4(5) s | β$^+$ | $^{137}$Sm | 11/2$^−$ | |
| $^{138}$Eu | 63 | 75 | 137,93371(3) | 12,1(6) s | β$^+$ | $^{138}$Sm | (6$^−$) | |
| $^{139}$Eu | 63 | 76 | 138,929792(14) | 17,9(6) s | β$^+$ | $^{139}$Sm | 11/2$^−$ | |
| $^{140}$Eu | 63 | 77 | 139,92809(6) | 1,51(2) s | β$^+$ | $^{140}$Sm | 1$^+$ | |
| $^{140m}$Eu | 210(15) keV | 210(15) keV | 210(15) keV | 125(2) ms | IT (99%) | $^{140}$Eu | 5$^−$ | |
| $^{140m}$Eu | 210(15) keV | 210(15) keV | 210(15) keV | 125(2) ms | β$^+$(1%) | $^{140}$Sm | 5$^−$ | |
| $^{141}$Eu | 63 | 78 | 140,924931(14) | 40,7(7) s | β$^+$ | $^{141}$Sm | 5/2$^+$ | |
| $^{141m}$Eu | 96,45(7) keV | 96,45(7) keV | 96,45(7) keV | 2,7(3) s | IT (86%) | $^{141}$Eu | 11/2$^−$ | |
| $^{141m}$Eu | 96,45(7) keV | 96,45(7) keV | 96,45(7) keV | 2,7(3) s | β$^+$ (14%) | $^{141}$Sm | 11/2$^−$ | |
| $^{142}$Eu | 63 | 79 | 141,92343(3) | 2,36(10) s | β$^+$ | $^{142}$Sm | 1$^+$ | |
| $^{142m}$Eu | 460(30) keV | 460(30) keV | 460(30) keV | 1,223(8) min | β$^+$ | $^{142}$Sm | 8$^−$ | |
| $^{143}$Eu | 63 | 80 | 142,920298(12) | 2,59(2) min | β$^+$ | $^{143}$Sm | 5/2$^+$ | |
| $^{143m}$Eu | 389,51(4) keV | 389,51(4) keV | 389,51(4) keV | 50,0(5) µs | | | 11/2$^−$ | |
| $^{144}$Eu | 63 | 81 | 143,918817(12) | 10,2(1) s | β$^+$ | $^{144}$Sm | 1$^+$ | |
| $^{144m}$Eu | 1127,6(6) keV | 1127,6(6) keV | 1127,6(6) keV | 1,0(1) µs | | | (8$^−$) | |
| $^{145}$Eu | 63 | 82 | 144,916265(4) | 5,93(4) dagen | β$^+$ | $^{145}$Sm | 5/2$^+$ | |
| $^{145m}$Eu | 716,0(3) keV | 716,0(3) keV | 716,0(3) keV | 490 ns | | | 11/2$^−$ | |
| $^{146}$Eu | 63 | 83 | 145,917206(7) | 4,61(3) dagen | β$^+$ | $^{146}$Sm | 4$^−$ | |
| $^{146m}$Eu | 666,37(16) keV | 666,37(16) keV | 666,37(16) keV | 235(3) µs | | | 9$^+$ | |
| $^{147}$Eu | 63 | 84 | 146,916746(3) | 24,1(6) dagen | β$^+$ (99,99%) | $^{147}$Sm | 5/2$^+$ | |
| $^{147}$Eu | 63 | 84 | 146,916746(3) | 24,1(6) dagen | α (0,0022%) | $^{143}$Pm | 5/2$^+$ | |
| $^{148}$Eu | 63 | 85 | 147,918086(11) | 54,5(5) dagen | β$^+$ (100%) | $^{148}$Sm | 5$^−$ | |
| $^{148}$Eu | 63 | 85 | 147,918086(11) | 54,5(5) dagen | α (9,39 × 10$^{−7}$%) | $^{144}$Pm | 5$^−$ | |
| $^{149}$Eu | 63 | 86 | 148,917931(5) | 93,1(4) dagen | EV | $^{149}$Sm | 5/2$^+$ | |
| $^{150}$Eu | 63 | 87 | 149,919702(7) | 36,9(9) jaar | β$^+$ | $^{150}$Sm | 5$^−$ | |
| $^{150m}$Eu | 42,1(5) keV | 42,1(5) keV | 42,1(5) keV | 12,8(1) uur | β$^−$ (89%) | $^{150}$Gd | 0$^−$ | |
| $^{150m}$Eu | 42,1(5) keV | 42,1(5) keV | 42,1(5) keV | 12,8(1) uur | β$^+$ (11%) | $^{150}$Sm | 0$^−$ | |
| $^{150m}$Eu | 42,1(5) keV | 42,1(5) keV | 42,1(5) keV | 12,8(1) uur | IT (5 × 10$^{−8}$%) | $^{150}$Eu | 0$^−$ | |
| $^{151}$Eu | 63 | 88 | 150,9198502(26) | 5 × 10$^{18}$ jaar | α | $^{147}$Pm | 5/2$^+$ | 0,4781(6) |
| $^{151m}$Eu | 196,245(10) keV | 196,245(10) keV | 196,245(10) keV | 58,9(5) µs | | | 11/2$^−$ | |
| $^{152}$Eu | 63 | 89 | 151,9217445(26) | 13,537(6) jaar | β$^+$ (72,09%) | $^{152}$Sm | 3- | |
| $^{152}$Eu | 63 | 89 | 151,9217445(26) | 13,537(6) jaar | β$^−$ (27,9%) | $^{152}$Gd | 3- | |
| $^{152m1}$Eu | 45,5998(4) keV | 45,5998(4) keV | 45,5998(4) keV | 9,3116(13) uur | β$^−$ (72%) | $^{152}$Gd | 0$^−$ | |
| $^{152m1}$Eu | 45,5998(4) keV | 45,5998(4) keV | 45,5998(4) keV | 9,3116(13) uur | β$^+$ (28%) | $^{152}$Sm | 0$^−$ | |
| $^{152m2}$Eu | 65,2969(4) keV | 65,2969(4) keV | 65,2969(4) keV | 0,94(8) µs | | | 1$^−$ | |
| $^{152m3}$Eu | 78,2331(4) keV | 78,2331(4) keV | 78,2331(4) keV | 165(10) ns | | | 1$^+$ | |
| $^{152m4}$Eu | 89,8496(4) keV | 89,8496(4) keV | 89,8496(4) keV | 384(10) ns | | | 4$^+$ | |
| $^{152m5}$Eu | 147,86(10) keV | 147,86(10) keV | 147,86(10) keV | 96(1) min | | | 8$^−$ | |
| $^{153}$Eu | 63 | 90 | 152,9212303(26) | stabiel | stabiel | stabiel | 5/2$^+$ | 0,5219(6) |
| $^{154}$Eu | 63 | 91 | 153,9229792(26) | 8,593(4) jaar | β$^−$ (99,98%) | $^{154}$Gd | 3-$^−$ | |
| $^{154}$Eu | 63 | 91 | 153,9229792(26) | 8,593(4) jaar | EV (0,02%) | $^{154}$Sm | 3-$^−$ | |
| $^{154m1}$Eu | 145,3(3) keV | 145,3(3) keV | 145,3(3) keV | 46,3(4) min | IT | $^{154}$Eu | (8$^−$) | |
| $^{154m2}$Eu | 68,1702(4) keV | 68,1702(4) keV | 68,1702(4) keV | 2,2(1) µs | | | 2$^+$ | |
| $^{155}$Eu | 63 | 92 | 154,9228933(27) | 4,7611(13) jaar | β$^−$ | $^{155}$Gd | 5/2$^+$ | |
| $^{156}$Eu | 63 | 93 | 155,924752(6) | 15,19(8) d | β$^−$ | $^{156}$Gd | 0$^+$ | |
| $^{157}$Eu | 63 | 94 | 156,925424(6) | 15,18(3) uur | β$^−$ | $^{157}$Gd | 5/2$^+$ | |
| $^{158}$Eu | 63 | 95 | 157,92785(8) | 45,9(2) min | β$^−$ | $^{158}$Gd | (1$^−$) | |
| $^{159}$Eu | 63 | 96 | 158,929089(8) | 18,1(1) min | β$^−$ | $^{159}$Gd | 5/2$^+$ | |
| $^{160}$Eu | 63 | 97 | 159,93197(22) | 38(4) s | β$^−$ | $^{160}$Gd | 1$^−$ | |
| $^{161}$Eu | 63 | 98 | 160,93368(32) | 26(3) s | β$^−$ | $^{161}$Gd | 5/2$^+$ | |
| $^{162}$Eu | 63 | 99 | 161,93704(32) | 10,6(10) s | β$^−$ | $^{162}$Gd | | |
| $^{163}$Eu | 63 | 100 | 162,93921(54) | 6 s | β$^−$ | $^{163}$Gd | 5/2$^+$ | |
| $^{164}$Eu | 63 | 101 | 163,94299(64) | 2 s | β$^−$ | $^{164}$Gd | | |
| $^{165}$Eu | 63 | 102 | 164,94572(75) | 1 s | β$^−$ | $^{165}$Gd | 5/2$^+$ | |
| $^{166}$Eu | 63 | 103 | 165,94997(86) | 400 ms | β$^−$ | $^{166}$Gd | | |
| $^{167}$Eu | 63 | 104 | 166,95321(86) | 200 ms | β$^−$ | $^{167}$Gd | 5/2$^+$ | |

## Overzicht van isotopen per element

* (en) R.B. Firestone, S.Y. Frank Chu & C.M. Baglin (1999) - Table of Isotopes (online versie van de cd-rom)
* (en) G. Audi, A.H. Wapstra, C. Thibault, J. Blachot & O. Bersillon (2003) - The NUBASE evaluation of nuclear and decay properties, Nuclear Physics A, 729, pp. 3-128
* (en) J.R. de Laeter, J.K. Böhlke, P. De Bièvre, H. Hidaka, H.S. Peiser, K.J.R. Rosman & P.D.P. Taylor (2003) - Atomic weights of the elements. Review 2000 (IUPAC Technical Report), Pure and Applied Chemistry, 75 (6), pp. 683–800
* (en) M.E. Wieser (2006) - Atomic weights of the elements 2005 (IUPAC Technical Report), Pure and Applied Chemistry, 78 (11), pp. 2051–2066
* (en) David R. Lide (2004) - CRC Handbook of Chemistry and Physics (85th ed.), hoofdstuk 11, CRC Press - ISBN 978-0849304859
* ↑ (en) P. Belli, R. Bernabei, F. Cappella, R. Cerulli, C.J. Dai, F.A. Danevich, A. d'Angelo, A. Incicchitti, V.V. Kobychev, S.S. Nagorny, S. Nisi, F. Nozzoli, D. Prosperi, V.I. Tretyak & S.S. Yurchenko (2007) - Search for α decay of natural Europium, Nuclear Physics A, 789 (1-4), pp. 15-29. Gearchiveerd op 10 april 2016.
$^{130}$Eu · $^{131}$Eu · $^{132}$Eu · $^{133}$Eu · $^{134}$Eu · $^{135}$Eu · $^{136}$Eu · $^{136m}$Eu · $^{137}$Eu · $^{138}$Eu · $^{139}$Eu · $^{140}$Eu · $^{140m}$Eu · $^{141}$Eu · $^{141m}$Eu · $^{142}$Eu · $^{142m}$Eu · $^{143}$Eu · $^{143m}$Eu · $^{144}$Eu · $^{144m}$Eu · $^{145}$Eu · $^{145m}$Eu · $^{146}$Eu · $^{146m}$Eu · $^{147}$Eu · $^{148}$Eu · $^{149}$Eu · $^{150}$Eu · $^{150m}$Eu · $^{151}$Eu · $^{151m}$Eu · $^{152}$Eu · $^{152m1}$Eu · $^{152m2}$Eu · $^{152m3}$Eu · $^{152m4}$Eu · $^{152m5}$Eu · $^{153}$Eu · $^{154}$Eu · $^{154m1}$Eu · $^{154m2}$Eu · $^{155}$Eu · $^{156}$Eu · $^{157}$Eu · $^{158}$Eu · $^{159}$Eu · $^{160}$Eu · $^{161}$Eu · $^{162}$Eu · $^{163}$Eu · $^{164}$Eu · $^{165}$Eu · $^{166}$Eu · $^{167}$Eu · $^{168}$Eu