# Isotopen van barium

Het chemisch element barium (Ba), met een atoommassa van 137,327(7) u, bezit 6 stabiele isotopen: $^{132}$Ba, $^{134}$Ba, $^{135}$Ba, $^{136}$Ba, $^{137}$Ba en $^{138}$Ba, waarvan de laatste het meest abundant is (ongeveer 71,7%). De 33 radio-isotopen zijn onstabiel en hebben een relatief korte halveringstijd (de meeste minder dan een seconde).
De kortstlevende isotoop van barium is $^{153}$Ba, met een halfwaardetijd van ongeveer 80 milliseconden. De langstlevende is $^{130}$Ba, met een halfwaardetijd van 70 biljoen jaar. Deze isotoop is een radioactief primordiaal nuclide dat in kleine hoeveelheden op Aarde voorkomt. Het vervalt middels dubbele elektronenvangst tot de stabiele isotoop xenon-130.
De isotoop barium-114 is de lichtste isotoop die clusterverval ondergaat:
    $\mathrm {^{114}_{56}Ba\rightarrow \ _{6}^{12}C\ +\ _{50}^{102}Sn}$

## Overzicht

| Nuclide | Z (p) | N (n) | Isotopische massa (u) | Halveringstijd | Radioactief verval | VP | Kernspin | Isotopische verhouding (molfractie) |
| Natuurlijk voorkomen (molfractie) |||
| $^{114}$Ba | 56 | 58 | 113,95068(15) | 530(230) ms | β$^+$, p (99,59%) | $^{113}$Xe | 0$^+$ | |
| $^{114}$Ba | 56 | 58 | 113,95068(15) | 530(230) ms | α (0,37%) | $^{110}$Xe | 0$^+$ | |
| $^{114}$Ba | 56 | 58 | 113,95068(15) | 530(230) ms | β$^+$ (0,04%) | $^{114}$Cs | 0$^+$ | |
| $^{114}$Ba | 56 | 58 | 113,95068(15) | 530(230) ms | CV (0,0034%) | $^{102}$Sn, $^{12}$C | 0$^+$ | |
| $^{115}$Ba | 56 | 59 | 114,94737(64) | 0,45(5) s | β$^+$ | $^{115}$Cs | (5/2$^+$) | |
| $^{115}$Ba | 56 | 59 | 114,94737(64) | 0,45(5) s | β$^+$, p | $^{114}$Xe | (5/2$^+$) | |
| $^{116}$Ba | 56 | 60 | 115,94138(43) | 1,3(2) s | β$^+$ | $^{116}$Cs | 0$^+$ | |
| $^{116}$Ba | 56 | 60 | 115,94138(43) | 1,3(2) s | β$^+$, p | $^{115}$Xe | 0$^+$ | |
| $^{117}$Ba | 56 | 61 | 116,93850(32) | 1,75(7) s | β$^+$ | $^{117}$Cs | (3/2$^+$) | |
| $^{117}$Ba | 56 | 61 | 116,93850(32) | 1,75(7) s | β$^+$, α | $^{113}$I | (3/2$^+$) | |
| $^{117}$Ba | 56 | 61 | 116,93850(32) | 1,75(7) s | β$^+$, p | $^{116}$Xe | (3/2$^+$) | |
| $^{118}$Ba | 56 | 62 | 117,93304(21) | 5,2(2) s | β$^+$ | $^{118}$Cs | 0$^+$ | |
| $^{118}$Ba | 56 | 62 | 117,93304(21) | 5,2(2) s | β$^+$, p | $^{117}$Xe | 0$^+$ | |
| $^{119}$Ba | 56 | 63 | 118,93066(21) | 5,4(3) s | β$^+$ | $^{119}$Cs | (5/2$^+$) | |
| $^{119}$Ba | 56 | 63 | 118,93066(21) | 5,4(3) s | β$^+$, p | $^{118}$Xe | (5/2$^+$) | |
| $^{120}$Ba | 56 | 64 | 119,92604(32) | 24(2) s | β$^+$ | $^{120}$Cs | 0$^+$ | |
| $^{121}$Ba | 56 | 65 | 120,92405(15) | 29,7(15) s | β$^+$ (99,98%) | $^{121}$Cs | 5/2$^+$ | |
| $^{121}$Ba | 56 | 65 | 120,92405(15) | 29,7(15) s | β$^+$, p (0,02%) | $^{120}$Xe | 5/2$^+$ | |
| $^{122}$Ba | 56 | 66 | 121,91990(3) | 1,95(15) min | β$^+$ | $^{122}$Cs | 0$^+$ | |
| $^{123}$Ba | 56 | 67 | 122,918781(13) | 2,7(4) min | β$^+$ | $^{123}$Cs | 5/2$^+$ | |
| $^{124}$Ba | 56 | 68 | 123,915094(13) | 11,0(5) min | β$^+$ | $^{124}$Cs | 0$^+$ | |
| $^{125}$Ba | 56 | 69 | 124,914473(12) | 3,5(4) min | β$^+$ | $^{125}$Cs | 1/2$^+$ | |
| $^{126}$Ba | 56 | 70 | 125,911250(13) | 100(2) min | β$^+$ | $^{126}$Cs | 0$^+$ | |
| $^{127}$Ba | 56 | 71 | 126,911094(12) | 12,7(4) min | β$^+$ | $^{127}$Cs | 1/2$^+$ | |
| $^{127m}$Ba | 80,33(12) keV | 80,33(12) keV | 80,33(12) keV | 1,9(2) s | IT | $^{127}$Ba | 7/2$^−$ | |
| $^{128}$Ba | 56 | 72 | 127,908318(11) | 2,43(5) d | β$^+$ | $^{128}$Cs | 0$^+$ | |
| $^{129}$Ba | 56 | 73 | 128,908679(12) | 2,23(11) uur | β$^+$ | $^{129}$Cs | 1/2$^+$ | |
| $^{129m}$Ba | 8,42(6) keV | 8,42(6) keV | 8,42(6) keV | 2,16(2) uur | β$^+$ | $^{129}$Cs | 7/2$^+$ | |
| $^{129m}$Ba | 8,42(6) keV | 8,42(6) keV | 8,42(6) keV | 2,16(2) uur | IT | $^{129}$Ba | 7/2$^+$ | |
| $^{130}$Ba | 56 | 74 | 129,9063208(30) | 7 × 10$^{13}$ jaar | 2EV | $^{130}$Xe | 0$^+$ | 0,00106(1) |
| $^{130m}$Ba | 2475,12(18) keV | 2475,12(18) keV | 2475,12(18) keV | 9,54(14) ms | IT | $^{130}$Ba | 8$^−$ | |
| $^{131}$Ba | 56 | 75 | 130,906941(3) | 11,50(6) d | β$^+$ | $^{131}$Cs | 1/2$^+$ | |
| $^{131m}$Ba | 187,14(12) keV | 187,14(12) keV | 187,14(12) keV | 14,6(2) min | IT | $^{131}$Ba | 9/2$^−$ | |
| $^{132}$Ba | 56 | 76 | 131,9050613(11) | stabiel | stabiel | stabiel | 0$^+$ | 0,00101(1) |
| $^{133}$Ba | 56 | 77 | 132,9060075(11) | 10,51(5) jaar | EV | $^{133}$Cs | 1/2$^+$ | |
| $^{133m}$Ba | 288,247(9) keV | 288,247(9) keV | 288,247(9) keV | 38,9(1) uur | IT (99,99%) | $^{133}$Ba | 11/2$^−$ | |
| $^{133m}$Ba | 288,247(9) keV | 288,247(9) keV | 288,247(9) keV | 38,9(1) uur | EV (0,0096%) | $^{133}$Cs | 11/2$^−$ | |
| $^{134}$Ba | 56 | 78 | 133,9045084(4) | stabiel | stabiel | stabiel | 0$^+$ | 0,02417(18) |
| $^{135}$Ba | 56 | 79 | 134,9056886(4) | stabiel | stabiel | stabiel | 3/2$^+$ | 0,06592(12) |
| $^{135m}$Ba | 268,22(2) keV | 268,22(2) keV | 268,22(2) keV | 28,7(2) uur | IT | $^{135}$Ba | 11/2$^−$ | |
| $^{136}$Ba | 56 | 80 | 135,9045759(4) | stabiel | stabiel | stabiel | 0$^+$ | 0,07854(24) |
| $^{136m}$Ba | 2030,466(18) keV | 2030,466(18) keV | 2030,466(18) keV | 308,4(19) ms | IT | $^{136}$Ba | 7$^−$ | |
| $^{137}$Ba | 56 | 81 | 136,9058274(5) | stabiel | stabiel | stabiel | 3/2$^+$ | 0,11232(24) |
| $^{137m1}$Ba | 661,659(3) keV | 661,659(3) keV | 661,659(3) keV | 2,552(1) min | IT | $^{137}$Ba | 11/2$^−$ | |
| $^{137m2}$Ba | 2349,1(4) keV | 2349,1(4) keV | 2349,1(4) keV | 0,59(10) µs | | | (17/2$^−$) | |
| $^{138}$Ba | 56 | 82 | 137,9052472(5) | stabiel | stabiel | stabiel | 0$^+$ | 0,71698(42) |
| $^{138m}$Ba | 2090,54(6) keV | 2090,54(6) keV | 2090,54(6) keV | 800(100) ns | | | 6$^+$ | |
| $^{139}$Ba | 56 | 83 | 138,9088413(5) | 83,06(28) min | β$^−$ | $^{139}$La | 7/2− | |
| $^{140}$Ba | 56 | 84 | 139,910605(9) | 12,752(3) dagen | β$^−$ | $^{140}$La | 0$^+$ | |
| $^{141}$Ba | 56 | 85 | 140,914411(9) | 18,27(7) min | β$^−$ | $^{141}$La | 3/2$^−$ | |
| $^{142}$Ba | 56 | 86 | 141,916453(7) | 10,6(2) min | β$^−$ | $^{142}$La | 0$^+$ | |
| $^{143}$Ba | 56 | 87 | 142,920627(14) | 14,5(3) s | β$^−$ | $^{143}$La | 5/2$^−$ | |
| $^{144}$Ba | 56 | 88 | 143,922953(14) | 11,5(2) s | β$^−$ (96,4%) | $^{144}$La | 0$^+$ | |
| $^{144}$Ba | 56 | 88 | 143,922953(14) | 11,5(2) s | β$^+$ (3,59%) | $^{144}$Cs | 0$^+$ | |
| $^{145}$Ba | 56 | 89 | 144,92763(8) | 4,31(16) s | β$^−$ | $^{145}$La | 5/2$^−$ | |
| $^{146}$Ba | 56 | 90 | 145,93022(8) | 2,22(7) s | β$^−$ (99,98%) | $^{146}$La | 0$^+$ | |
| $^{146}$Ba | 56 | 90 | 145,93022(8) | 2,22(7) s | β$^−$, n (0,02%) | $^{145}$La | 0$^+$ | |
| $^{147}$Ba | 56 | 91 | 146,93495(22) | 0,893(1) s | β$^−$ (99,94%) | $^{147}$La | (3/2$^+$) | |
| $^{147}$Ba | 56 | 91 | 146,93495(22) | 0,893(1) s | β$^−$, n (0,06%) | $^{146}$La | (3/2$^+$) | |
| $^{148}$Ba | 56 | 92 | 147,93772(9) | 0,612(17) s | β$^−$ (99,6%) | $^{148}$La | 0$^+$ | |
| $^{148}$Ba | 56 | 92 | 147,93772(9) | 0,612(17) s | β$^−$, n (0,4%) | $^{147}$La | 0$^+$ | |
| $^{149}$Ba | 56 | 93 | 148,94258(21) | 344(7) ms | β$^−$ (99,57%) | $^{149}$La | 3/2$^−$ | |
| $^{149}$Ba | 56 | 93 | 148,94258(21) | 344(7) ms | β$^−$, n (0,43%) | $^{148}$La | 3/2$^−$ | |
| $^{150}$Ba | 56 | 94 | 149,94568(43) | 300 ms | β$^−$ | $^{150}$La | 0$^+$ | |
| $^{150}$Ba | 56 | 94 | 149,94568(43) | 300 ms | β$^−$, n (zelden) | $^{149}$La | 0$^+$ | |
| $^{151}$Ba | 56 | 95 | 150,95081(43) | 200 ms | β$^−$ | $^{151}$La | 3/2$^−$ | |
| $^{152}$Ba | 56 | 96 | 151,95427(54) | 100 ms | β$^−$ | $^{152}$La | 0$^+$ | |
| $^{153}$Ba | 56 | 97 | 152,95961(86) | 80 ms | β$^−$ | $^{153}$La | 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) WolframAlpha
$^{113}$Ba · $^{114}$Ba · $^{115}$Ba · $^{116}$Ba · $^{117}$Ba · $^{118}$Ba · $^{119}$Ba · $^{120}$Ba · $^{121}$Ba · $^{122}$Ba · $^{123}$Ba · $^{124}$Ba · $^{125}$Ba · $^{126}$Ba · $^{127}$Ba · $^{127m}$Ba · $^{128}$Ba · $^{129}$Ba · $^{129m}$Ba · $^{130}$Ba · $^{130m}$Ba · $^{131}$Ba · $^{131m}$Ba · $^{132}$Ba · $^{133}$Ba · $^{133m}$Ba · $^{134}$Ba · $^{135}$Ba · $^{135m}$Ba · $^{136}$Ba · $^{136m}$Ba · $^{137}$Ba · $^{137m1}$Ba · $^{137m2}$Ba · $^{138}$Ba · $^{138m}$Ba · $^{139}$Ba · $^{140}$Ba · $^{141}$Ba · $^{142}$Ba · $^{143}$Ba · $^{144}$Ba · $^{145}$Ba · $^{146}$Ba · $^{147}$Ba · $^{148}$Ba · $^{149}$Ba · $^{150}$Ba · $^{151}$Ba · $^{152}$Ba · $^{153}$Ba · $^{154}$Ba