Английская Википедия:Isotopes of barium

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Шаблон:Short description Шаблон:Infobox barium isotopes Naturally occurring barium (₅₆Ba) is a mix of six stable isotopes and one very long-lived radioactive primordial isotope, barium-130, identified as being unstable by geochemical means (from analysis of the presence of its daughter xenon-130 in rocks) in 2001. This nuclide decays by double electron capture (absorbing two electrons and emitting two neutrinos), with a half-life of (0.5–2.7)×10²¹ years (about 10¹¹ times the age of the universe).

There are a total of thirty-three known radioisotopes in addition to ¹³⁰Ba. The longest-lived of these is ¹³³Ba, which has a half-life of 10.51 years. All other radioisotopes have half-lives shorter than two weeks. The longest-lived isomer is ^133mBa, which has a half-life of 38.9 hours. The shorter-lived ^137mBa (half-life 2.55 minutes) arises as the decay product of the common fission product caesium-137.

Barium-114 is predicted to undergo cluster decay, emitting a nucleus of stable ¹²C to produce ¹⁰²Sn. However this decay is not yet observed; the upper limit on the branching ratio of such decay is 0.0034%.

List of isotopes

Шаблон:Isotopes table |- | rowspan=4|¹¹⁴Ba | rowspan=4 style="text-align:right" | 56 | rowspan=4 style="text-align:right" | 58 | rowspan=4|113.95072(11) | rowspan=4|530(230) ms
[0.43(+30−15) s] | β⁺, p (99.59%) | ¹¹³Xe | rowspan=4|0+ | rowspan=4| | rowspan=4| |- | α (.37%) | ¹¹⁰Xe |- | β⁺ (.04%) | ¹¹⁴Cs |- | CD (<.0034%) | ¹⁰²Sn, ¹²C |- | rowspan=2|¹¹⁵Ba | rowspan=2 style="text-align:right" | 56 | rowspan=2 style="text-align:right" | 59 | rowspan=2|114.94748(22)# | rowspan=2|0.45(5) s | β⁺ | ¹¹⁵Cs | rowspan=2|(5/2+)# | rowspan=2| | rowspan=2| |- | β⁺, p | ¹¹⁴Xe |- | rowspan=2|¹¹⁶Ba | rowspan=2 style="text-align:right" | 56 | rowspan=2 style="text-align:right" | 60 | rowspan=2|115.94162(22)# | rowspan=2|1.3(2) s | β⁺ | ¹¹⁶Cs | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β⁺, p | ¹¹⁵Xe |- | rowspan=3|¹¹⁷Ba | rowspan=3 style="text-align:right" | 56 | rowspan=3 style="text-align:right" | 61 | rowspan=3|116.93832(27) | rowspan=3|1.75(7) s | β⁺ | ¹¹⁷Cs | rowspan=3|(3/2)(+#) | rowspan=3| | rowspan=3| |- | β⁺, α | ¹¹³I |- | β⁺, p | ¹¹⁶Xe |- | rowspan=2|¹¹⁸Ba | rowspan=2 style="text-align:right" | 56 | rowspan=2 style="text-align:right" | 62 | rowspan=2|117.93323(22)# | rowspan=2|5.2(2) s | β⁺ | ¹¹⁸Cs | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β⁺, p | ¹¹⁷Xe |- | rowspan=2|¹¹⁹Ba | rowspan=2 style="text-align:right" | 56 | rowspan=2 style="text-align:right" | 63 | rowspan=2|118.93066(21) | rowspan=2|5.4(3) s | β⁺ | ¹¹⁹Cs | rowspan=2|(5/2+) | rowspan=2| | rowspan=2| |- | β⁺, p | ¹¹⁸Xe |- | ¹²⁰Ba | style="text-align:right" | 56 | style="text-align:right" | 64 | 119.92604(32) | 24(2) s | β⁺ | ¹²⁰Cs | 0+ | | |- | rowspan=2|¹²¹Ba | rowspan=2 style="text-align:right" | 56 | rowspan=2 style="text-align:right" | 65 | rowspan=2|120.92405(15) | rowspan=2|29.7(15) s | β⁺ (99.98%) | ¹²¹Cs | rowspan=2|5/2(+) | rowspan=2| | rowspan=2| |- | β⁺, p (.02%) | ¹²⁰Xe |- | ¹²²Ba | style="text-align:right" | 56 | style="text-align:right" | 66 | 121.91990(3) | 1.95(15) min | β⁺ | ¹²²Cs | 0+ | | |- | ¹²³Ba | style="text-align:right" | 56 | style="text-align:right" | 67 | 122.918781(13) | 2.7(4) min | β⁺ | ¹²³Cs | 5/2(+) | | |- | ¹²⁴Ba | style="text-align:right" | 56 | style="text-align:right" | 68 | 123.915094(13) | 11.0(5) min | β⁺ | ¹²⁴Cs | 0+ | | |- | ¹²⁵Ba | style="text-align:right" | 56 | style="text-align:right" | 69 | 124.914472(12) | 3.5(4) min | β⁺ | ¹²⁵Cs | 1/2(+#) | | |- | ¹²⁶Ba | style="text-align:right" | 56 | style="text-align:right" | 70 | 125.911250(13) | 100(2) min | β⁺ | ¹²⁶Cs | 0+ | | |- | ¹²⁷Ba | style="text-align:right" | 56 | style="text-align:right" | 71 | 126.911091(12) | 12.7(4) min | β⁺ | ¹²⁷Cs | 1/2+ | | |- | style="text-indent:1em" | ^127mBa | colspan="3" style="text-indent:2em" | 80.33(12) keV | 1.9(2) s | IT | ¹²⁷Ba | 7/2− | | |- | ¹²⁸Ba | style="text-align:right" | 56 | style="text-align:right" | 72 | 127.9083524(17) | 2.43(5) d | β⁺ | ¹²⁸Cs | 0+ | | |- | ¹²⁹Ba | style="text-align:right" | 56 | style="text-align:right" | 73 | 128.908683(11) | 2.23(11) h | β⁺ | ¹²⁹Cs | 1/2+ | | |- | rowspan=2 style="text-indent:1em" | ^129mBa | rowspan=2 colspan="3" style="text-indent:2em" | 8.42(6) keV | rowspan=2|2.16(2) h | β⁺ | ¹²⁹Cs | rowspan=2|7/2+# | rowspan=2| | rowspan=2| |- | IT | ¹²⁹Ba |- | ¹³⁰Ba | style="text-align:right" | 56 | style="text-align:right" | 74 | 129.9063260(3) | 1.6(±1.1)×10²¹ y | Double EC | ¹³⁰Xe | 0+ | 0.00106(1) | |- | style="text-indent:1em" | ^130mBa | colspan="3" style="text-indent:2em" | 2475.12(18) keV | 9.54(14) ms | IT | ¹³⁰Ba | 8− | | |- | ¹³¹Ba | style="text-align:right" | 56 | style="text-align:right" | 75 | 130.9069463(4) | 11.50(6) d | β⁺ | ¹³¹Cs | 1/2+ | | |- | style="text-indent:1em" | ^131mBa | colspan="3" style="text-indent:2em" | 187.14(12) keV | 14.6(2) min | IT | ¹³¹Ba | 9/2− | | |- | ¹³²Ba | style="text-align:right" | 56 | style="text-align:right" | 76 | 131.9050612(11) | colspan=3 align=center|Observationally Stable | 0+ | 0.00101(1) | |- | ¹³³Ba | style="text-align:right" | 56 | style="text-align:right" | 77 |132.9060074(11) | 10.51(5) y | EC | ¹³³Cs | 1/2+ | | |- | rowspan=2 style="text-indent:1em" | ^133mBa | rowspan=2 colspan="3" style="text-indent:2em" | 288.247(9) keV | rowspan=2|38.9(1) h | IT (99.99%) | ¹³³Ba | rowspan=2|11/2− | rowspan=2| | rowspan=2| |- | EC (.0096%) | ¹³³Cs |- | ¹³⁴Ba | style="text-align:right" | 56 | style="text-align:right" | 78 | 133.90450825(27) | colspan=3 align=center|Stable | 0+ | 0.02417(18) | |- | ¹³⁵Ba | style="text-align:right" | 56 | style="text-align:right" | 79 | 134.90568845(26) | colspan=3 align=center|Stable | 3/2+ | 0.06592(12) | |- | style="text-indent:1em" | ^135mBa | colspan="3" style="text-indent:2em" | 268.22(2) keV | 28.7(2) h | IT | ¹³⁵Ba | 11/2− | | |- | ¹³⁶Ba | style="text-align:right" | 56 | style="text-align:right" | 80 |135.90457580(26) | colspan=3 align=center|Stable | 0+ | 0.07854(24) | |- | style="text-indent:1em" | ^136mBa | colspan="3" style="text-indent:2em" | 2030.466(18) keV | 308.4(19) ms | IT | ¹³⁶Ba | 7− | | |- | ¹³⁷Ba | style="text-align:right" | 56 | style="text-align:right" | 81 |136.90582721(27) | colspan=3 align=center|Stable | 3/2+ | 0.11232(24) | |- | style="text-indent:1em" | ^137m1Ba | colspan="3" style="text-indent:2em" | 661.659(3) keV | 2.552(1) min | IT | ¹³⁷Ba | 11/2− | | |- | style="text-indent:1em" | ^137m2Ba | colspan="3" style="text-indent:2em" | 2349.1(4) keV | 0.59(10) µs | | | (17/2−) | | |- | ¹³⁸Ba | style="text-align:right" | 56 | style="text-align:right" | 82 | 137.90524706(27) | colspan=3 align=center|Stable | 0+ | 0.71698(42) | |- | style="text-indent:1em" | ^138mBa | colspan="3" style="text-indent:2em" | 2090.54(6) keV | 800(100) ns | | | 6+ | | |- | ¹³⁹Ba | style="text-align:right" | 56 | style="text-align:right" | 83 | 138.90884116(27) | 83.06(28) min | β⁻ | ¹³⁹La | 7/2− | | |- | ¹⁴⁰Ba | style="text-align:right" | 56 | style="text-align:right" | 84 | 139.910608(8) | 12.752(3) d | β⁻ | ¹⁴⁰La | 0+ | | |- | ¹⁴¹Ba | style="text-align:right" | 56 | style="text-align:right" | 85 | 140.914404(6) | 18.27(7) min | β⁻ | ¹⁴¹La | 3/2− | | |- | ¹⁴²Ba | style="text-align:right" | 56 | style="text-align:right" | 86 | 141.916433(6) | 10.6(2) min | β⁻ | ¹⁴²La | 0+ | | |- | ¹⁴³Ba | style="text-align:right" | 56 | style="text-align:right" | 87 | 142.920625(7) | 14.5(3) s | β⁻ | ¹⁴³La | 5/2− | | |- | ¹⁴⁴Ba | style="text-align:right" | 56 | style="text-align:right" | 88 |143.922955(8) | 11.5(2) s | β⁻ | ¹⁴⁴La | 0+ | | |- | ¹⁴⁵Ba | style="text-align:right" | 56 | style="text-align:right" | 89 | 144.927518(9) | 4.31(16) s | β⁻ | ¹⁴⁵La | 5/2− | | |- | rowspan=2|¹⁴⁶Ba | rowspan=2 style="text-align:right" | 56 | rowspan=2 style="text-align:right" | 90 | rowspan=2|145.9303632(19) | rowspan=2|2.22(7) s | β⁻ (99.98%) | ¹⁴⁶La | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β⁻, n (.02%) | ¹⁴⁵La |- | rowspan=2|¹⁴⁷Ba | rowspan=2 style="text-align:right" | 56 | rowspan=2 style="text-align:right" | 91 | rowspan=2|146.935304(21) | rowspan=2|0.893(1) s | β⁻ (99.94%) | ¹⁴⁷La | rowspan=2|(3/2+) | rowspan=2| | rowspan=2| |- | β⁻, n (.06%) | ¹⁴⁶La |- | rowspan=2|¹⁴⁸Ba | rowspan=2 style="text-align:right" | 56 | rowspan=2 style="text-align:right" | 92 | rowspan=2| 147.9382230(16) | rowspan=2|0.612(17) s | β⁻ (99.6%) | ¹⁴⁸La | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β⁻, n (.4%) | ¹⁴⁷La |- | rowspan=2|¹⁴⁹Ba | rowspan=2 style="text-align:right" | 56 | rowspan=2 style="text-align:right" | 93 | rowspan=2|148.9432840(27) | rowspan=2|344(7) ms | β⁻ (99.57%) | ¹⁴⁹La | rowspan=2|3/2−# | rowspan=2| | rowspan=2| |- | β⁻, n (.43%) | ¹⁴⁸La |- | rowspan=2|¹⁵⁰Ba | rowspan=2 style="text-align:right" | 56 | rowspan=2 style="text-align:right" | 94 | rowspan=2| 149.946441(6) | rowspan=2|300 ms | β⁻ | ¹⁵⁰La | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β⁻, n (rare) | ¹⁴⁹La |- | ¹⁵¹Ba | style="text-align:right" | 56 | style="text-align:right" | 95 | 150.95176(43)# | 200# ms [>300 ns] | β⁻ | ¹⁵¹La | 3/2−# | | |- | ¹⁵²Ba | style="text-align:right" | 56 | style="text-align:right" | 96 | 151.95533(43)# | 100# ms | β⁻ | ¹⁵²La | 0+ | | |- | ¹⁵³Ba | style="text-align:right" | 56 | style="text-align:right" | 97 | 152.96085(43)# | 80# ms | β⁻ | ¹⁵³La | 5/2−# | | |- | ¹⁵⁴Ba | style="text-align:right" | 56 | style="text-align:right" | 98 |153.96466(54)# | 53(48) ms | β⁻ | ¹⁵⁴La | 0+ | | Шаблон:Isotopes table/footer

References

• Isotope masses from:
  • Шаблон:NUBASE 2003
• Isotopic compositions and standard atomic masses from:
  • Шаблон:CIAAW2003
  • Шаблон:CIAAW 2005
• Half-life, spin, and isomer data selected from the following sources.
  • Шаблон:NUBASE 2003
  • Шаблон:NNDC
  • Шаблон:CRC85
• Half-life of ¹³⁰Ba from:
  • Шаблон:Cite journal
  • Шаблон:Cite journal