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Isotopes of Barium

List, data and properties of all known isotopes of Barium.


Content

Barium isotopes

All atomic nuclei of the chemical element barium are summarized under barium isotopes; these consist of an atomic nucleus with 56 protons and in the uncharged state of 56 electrons. The difference between the individual barium isotopes lies in the number of neutrons in the nucleus.

 

Naturally Occurring Barium Isotopes

Barium, an element from the group of alkaline earth metals, occurs in nature as a mixture of 6 stable isotopes and an unstable, primordial nuclide with a long half-life:

Atomic Mass maQuantityHalf-lifeSpin
Barium
Isotopic mixture
137,327 u100 %
Isotope 130Ba129,90632(2) u0,11(1) %1.6 × 1021 a0+
Isotope 132Ba131,9050611(11) u0,10(1) %stable0+
Isotope 134Ba133,904508(2) u2,42(15) %stable0+
Isotope 135Ba134,905688(2) u6,59(10) %stable3/2+
Isotope 136Ba135,904576(2) u7,85(24) %stable0+
Isotope 137Ba136,905827(2) u11,23(23) %stable3/2+
Isotope 138Ba137,905247(2) u71,70(29) %stable0+

 

All other barium nuclides are unstable and decay, emitting radioactive radiation.

 

Isotope Table: Barium

The two following tables list the most important data and properties of the Barium isotopes. Further information on the individual Barium isotopes is listed on separate pages and can be accessed via the link in column 1.

 

Atomic Properties

Isotope
Nuclide
ENAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
Parent
123456
Barium-11411456Ba58113.95072(11) u
[113.9200016 u]
{-45.90402 MeV}
0+
Barium-11511556Ba59114.94737(21) u
[114.9166516 u]
{-49.02453 MeV}
(5/2+)
Barium-11611656Ba60115.94141(21) u
[115.9106916 u]
{-54.57623 MeV}
0+
Barium-11711756Ba61116.93832(27) u
[116.9076016 u]
{-57.45455 MeV}
(3/2)(+)117La
Barium-11811856Ba62117.93306(21) u
[117.9023416 u]
{-62.35421 MeV}
0+118La
Barium-11911956Ba63118.93066(21) u
[118.8999416 u]
{-64.58979 MeV}
(5/2+)119La
Barium-12012056Ba64119.92604(32) u
[119.8953216 u]
{-68.8933 MeV}
0+120La
Barium-12112156Ba65120.92405(15) u
[120.8933316 u]
{-70.74697 MeV}
5/2(+)121La
Barium-12212256Ba66121.91990(3) u
[121.8891816 u]
{-74.61267 MeV}
0+122La
Barium-12312356Ba67122.918781(13) u
[122.8880626 u]
{-75.65501 MeV}
5/2(+)123La
Barium-12412456Ba68123.915094(13) u
[123.8843756 u]
{-79.08943 MeV}
0+124La
Barium-12512556Ba69124.914472(12) u
[124.8837536 u]
{-79.66882 MeV}
1/2(+)125La
Barium-12612656Ba70125.911250(13) u
[125.8805316 u]
{-82.67009 MeV}
0+126La
Barium-12712756Ba71126.911091(12) u
[126.8803726 u]
{-82.8182 MeV}
1/2+127La
Barium-127m127m56Ba71126.911091(12) u
[126.8803726 u]
{-82.8182 MeV}
7/2-
Barium-12812856Ba72127.908342(6) u
[127.8776236 u]
{-85.37888 MeV}
0+128La
Barium-12912956Ba73128.908681(11) u
[128.8779626 u]
{-85.0631 MeV}
1/2+129La
Barium-129m129m56Ba73128.908681(11) u
[128.8779626 u]
{-85.0631 MeV}
7/2+
Barium-13013056Ba74129.90632(2) u
[129.8756016 u]
{-87.26236 MeV}
0+130La
130Cs
Barium-130m130m56Ba74129.90632(2) u
[129.8756016 u]
{-87.26236 MeV}
8-
Barium-13113156Ba75130.9069412(28) u
[130.8762228 u]
{-86.68371 MeV}
1/2+131La
Barium-131m131m56Ba75130.9069412(28) u
[130.8762228 u]
{-86.68371 MeV}
9/2-
Barium-13213256Ba76131.9050611(11) u
[131.8743427 u]
{-88.43502 MeV}
0+132La
132Cs
Barium-13313356Ba77132.9060074(11) u
[132.875289 u]
{-87.55354 MeV}
1/2+133La
Barium-133m133m56Ba77132.9060074(11) u
[132.875289 u]
{-87.55354 MeV}
11/2-
Barium-13413456Ba78133.904508(2) u
[133.8737896 u]
{-88.95023 MeV}
0+134La
134Cs
134Xe
Barium-13513556Ba79134.905688(2) u
[134.8749696 u]
{-87.85106 MeV}
3/2+135La
135Cs
Barium-135m135m56Ba79134.905688(2) u
[134.8749696 u]
{-87.85106 MeV}
11/2-
Barium-13613656Ba80135.904576(2) u
[135.8738576 u]
{-88.88688 MeV}
0+136La
136Cs
136Xe
136Ce
Barium-136m136m56Ba80135.904576(2) u
[135.8738576 u]
{-88.88688 MeV}
7-
Barium-13713756Ba81136.905827(2) u
[136.8751086 u]
{-87.72158 MeV}
3/2+137La
137Cs
Barium-137m137m56Ba81136.905827(2) u
[136.8751086 u]
{-87.72158 MeV}
11/2-137Cs
Barium-137m2137m256Ba81136.905827(2) u
[136.8751086 u]
{-87.72158 MeV}
(17/2-)
Barium-13813856Ba82137.905247(2) u
[137.8745286 u]
{-88.26185 MeV}
0+138La
138Cs
138Ce
Barium-138m138m56Ba82137.905247(2) u
[137.8745286 u]
{-88.26185 MeV}
6+
Barium-13913956Ba83138.9088413(3) u
[138.8781229 u]
{-84.91378 MeV}
7/2-139Cs
Barium-14014056Ba84139.910607(9) u
[139.8798886 u]
{-83.26904 MeV}
0+140Cs
Barium-14114156Ba85140.914403(6) u
[140.8836846 u]
{-79.73309 MeV}
3/2-141Cs
Barium-14214256Ba86141.916433(6) u
[141.8857146 u]
{-77.84216 MeV}
0+142Cs
Barium-14314356Ba87142.920625(7) u
[142.8899066 u]
{-73.93734 MeV}
5/2-143Cs
Barium-14414456Ba88143.922955(8) u
[143.8922366 u]
{-71.76696 MeV}
0+144Cs
145Cs
Barium-14514556Ba89144.92763(8) u
[144.8969116 u]
{-67.41222 MeV}
5/2-145Cs
Barium-14614656Ba90145.930276(22) u
[145.8995576 u]
{-64.94749 MeV}
0+146Cs
Barium-14714756Ba91146.93495(22) u
[146.9042316 u]
{-60.59368 MeV}
(3/2-)147Cs
Barium-14814856Ba92147.93817(7) u
[147.9074516 u]
{-57.59427 MeV}
0+148Cs
Barium-14914956Ba93148.94258(21) u
[148.9118616 u]
{-53.48639 MeV}
3/2-149Cs
Barium-15015056Ba94149.94643(32) u
[149.9157116 u]
{-49.90013 MeV}
0+150Cs
Barium-15115156Ba95150.95175(43) u
[150.9210316 u]
{-44.94459 MeV}
3/2−151Cs
Barium-15215256Ba96151.95522(43) u
[151.9245016 u]
{-41.7123 MeV}
0+
Barium-15315356Ba97152.96085(43) u
[152.9301316 u]
{-36.46799 MeV}
5/2-

 

Radioactive Decay Properties

IsotopeRadioactive DecayExtern
Half-lifeDecay ModeProbabilityEnergy
789101112
Ba-1140.43 sβ+114Cs
β+, p → 113Xe
α → 110Xe
CD → C-12 + 102Sn
99.1(3) %
20(10) %
0.9(3) %
< 0.0034 %
8.78(12) MeV

3.592(19) MeV
AL
Ba-1150.45(5) sβ+115Cs
β+, p → 114Xe
< 85 %
> 15 %
10.68(22) MeV
AL
Ba-1161.3(2) sβ+116Cs
β+, p → 115Xe
97 %
3(1) %
7.46(22) MeV
AL
Ba-1171.75(7) sβ+117Cs
β+, p → 116Xe
β+, α → 113I
< 100 %
> 0
> 0
9.4(26) MeV

AL
Ba-1185.5(2) sβ+118Cs
EC, p → 117Xe
100 %
?
6.06(20) MeV
AL
Ba-1195.4(3) sβ+119Cs
EC, p → 118Xe
>75 %
< 25 %
7.71(20) MeV
AL
Ba-12024(2) sβ+120Cs100 %5.00(30) MeVAL
Ba-12129.7(15) sβ+121Cs100 %6.36(14) MeVAL
Ba-1221.95(15) minβ+122Cs100 %3.54(4) MeVAL
Ba-1232.7(4) minβ+123Cs100 %5.389(17) MeVAL
Ba-12411.0(5) minβ+124Cs100 %2.642(15) MeVAL
Ba-1253.3(3) minβ+125Cs100 %4.419(13) MeVAL
Ba-126100(2) minβ+126Cs100 %1.681(16) MeVAL
Ba-12712.7(4) minβ+127Cs100 %3.422(13) MeVAL
Ba-127m1.93(7) sIso → 127Ba100 %AL
Ba-1282.43(5) dEC → 128Cs100 %0.553(8) MeVAL
Ba-1292.23(11) hβ+129Cs100 %2.436(12) MeVAL
Ba-129m2.135(10) hβ+129Cs
Iso → 129Ba
ca. 100 %
?

AL
Ba-1301.6 × 1021 a2 EC 130XeAL
Ba-130m9.4(4) msIso → 130Ba100 %2.475 MeVAL
Ba-13111.50(6) dβ+131Cs100 %1.37(6)5 MeVAL
Ba-131m14.6(2) minIso 131Ba100 %0.187 MeVAL
Ba-132stable2 β+132XeAL
Ba-13310.551(11) aEC 133Cs100 %0.5174(10) MeVAL
Ba-133m38.93(10) hIso → 133Ba
EC → 133Cs
99.9896(5) %
0.0104(5) %
0.288 MeV
?
AL
Ba-134stableAL
Ba-135stableAL
Ba-135m28.7(2) hIso → 135Ba100 %0.2682 MeVAL
Ba-136stableAL
Ba-136m308.4(19) msIso → 136Ba100 %AL
Ba-137stableAL
Ba-137m2.552(1) minIso → 137Ba100 %AL
Ba-137m20.59(10) μsAL
Ba-138stableAL
Ba-138m0.85(10) μsAL
Ba-13982.93(9) minβ-139La100 %2.3125(20) MeVAL
Ba-14012.751(4) dβ-140La100 %1.047(8) MeVAL
Ba-14118.27(7) minβ-141La100 %3.199(7) MeVAL
Ba-14210.6(2) minβ-142La100 %2.182(8) MeVAL
Ba-14314.5(3) sβ-143La100 %4.234(10) MeVAL
Ba-14411.5(2) sβ-144La100 %3.083(15) MeVAL
Ba-1454.31(16) sβ-145La100 %5.319(15) MeVAL
Ba-1462.21(6) sβ-146La100 %4.10 MeVAL
Ba-147894(10) msβ-147La
β-, n → 146La
< 100 %
0.06(5) %
6.414(22) MeV
0.710(40) MeV
AL
Ba-148612(17) msβ-148La
β-, n → 147La
< 100 %
0.4(3) %
5.11(6) MeV
1.01(6) MeV
AL
Ba-149344(7) msβ-149La
β-, n → 148La
< 100 %
0.43(12) %
7.10(48) MeV
1.52(44) MeV
AL
Ba-150259(5) msβ- 150La
β-, n 149La
< 100 %
selten
6.23(53) MeV
2.25(36) MeV
AL
Ba-151167(5) msβ-151La
β-, n → 150La
< 100 %
selten
8.37(59) MeV
3.12(59) MeV
AL
Ba-152139(8) msβ-152La
β-, n → 151La
< 100 %
7.58(50) MeV
3.53(59) MeV
AL
Ba-1530.12(5) sβ- 153La
β-, n 152La
< 100 %
selten
9.59(50) MeV
4.75(50) MeV
AL

 

Notes (related to the columns):

1 - name of the nuclide, isotope.
2 - E: isotope symbol with mass number (superscript; number of nucleons) and Atomic number (subscript; number of protons).
3 - N: number of neutrons.
4 - relative atomic mass of the Barium isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to 12C = 12.00000 [2]. In addition, the mass excess is given in MeV.
5 - nuclear spin I, unit: h/2π.
6 - source nuclides: Possible, assumed or actual source nuclides (mother nuclides, parent nuclides). If applicable, the corresponding decay modes can be found in the data for the respective starting nuclide.

7 - isotope notation in short form.
8 - decay: half-live of the Barium isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
9 - decay mode: type of decay into the respective daughter nuclides with n = neutron emission; p = proton emission; α = alpha decay; β- = beta minus decay with electron emission; EC = electron capture; β+ = positron emission; ε = β+ and/or EC; Iso = isomeric transition; CD = cluster decay; SF = spontaneous decay.
10 - decay probability in percent (%).
11 - decay energy; Particle energy related to decay type.
12 - other information and notes: AL = Adopted Levels (link to external data [1]).

Miscellaneous:

()- Numbers in brackets: uncertainty to represent the spread of the reported value.
~ - Theoretical values or systematic trends.
  - unlisted-: Nuclides that have already been mentioned in the literature but for some reason can no longer be found in the current nuclide tables because their discovery e.g. has not confirmed.

 

NMR active Barium nuclides

Nuclide
quantity 1)
spin
Nuclear
magnetic
moment
μ/μN
Gyromagnetic ratio
{Quadrupole moment}
Resonant
frequency
v0 bei 1 T
Relative
sensitivity
H0 = const.
v0 = const. 3)
135Ba
6,59(10) %
3/2+
+0,8381(2)2,6755
{+ 0,153(2)}
4,26170,00501
0,5005
137Ba
11,23(23) %
3/2+
+0,9375(2)3,5575
{+ 0,245(4)}
4,76340,00700
0,5594

1) Quantity Percentage of natural occurrence.

2) Gyromagnetic ratio: 107 rad T-1 s-1
    Quadrupole moment: Q [barn] = [100 fm2]

3) Related to 1H = 1,000.

 

Radiation Protection

According to the Radiation Protection Ordinance (StrlSchV 2018, Germany), the following values (columns 1 to 7) apply to the handling of Barium radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Ba-126+107 Bq100 Bq/g100.0 min
Ba-128+107 Bq100 Bq/g2.4 d
Ba-131+106 Bq100 Bq/g10 Bq cm-2Cs-13111.6 d
Ba-131m107 Bq100 Bq/g14.6 min
Ba-133106 Bq0,1 Bq/g1 Bq cm-210.5 a
Ba-133m106 Bq100 Bq/g38.9 h
Ba-135m106 Bq100 Bq/g28.7 h
Ba-137m106 Bq10 Bq/g2.6 min
Ba-139105 Bq100 Bq/g83.1 min
Ba-140+105 Bq1 Bq/g1 Bq cm-2La-14012.8 d
Ba-141105 Bq10 Bq/g18.3 min
Ba-142106 Bq10 Bq/g10.6 min

(HASS = High-Activity Sealed Radioactive Sources; SC = surface contamination)

 

Literature Sources and References

Properties of the Barium nucleides

[1] - NuDat: National Nuclear Data Center, Brookhaven National Laboratory, based on ENSDF and the Nuclear Wallet Cards.

[2] - G. Audi et. al.: The NUBASE evaluation of nuclear and decay properties. Nuclear Physics, (2003), DOI 10.1016/j.nuclphysa.2003.11.001.

[3] - Live Chart of Nuclides. Nuclear structure and decay data.

Barium: NMR properties - 135Ba-NMR, 137Ba-NMR

[4] - N. J. Stone: Table of nuclear magnetic dipole and electric quadrupole moments. Atomic Data and Nuclear Data Tables, (2005), DOI 10.1016/j.adt.2005.04.001.

[5] - Pekka Pyykkö: Year-2008 nuclear quadrupole moments. Molecular Physics, (2008), DOI 10.1080/00268970802018367.

[6] - Pekka Pyykkö: Year-2017 nuclear quadrupole moments. Molecular Physics, (2018), DOI 10.1080/00268976.2018.1426131.

[7] - N. J. Stone: Table of recommended nuclear magnetic dipole moments. IAEA, (2019).

More sources:

[8] - Isotopic abundances, atomic weights and isotopic masses: see respective keyword.

 


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Last update: 2022-12-12


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