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Barium-130

Properties and data of the isotope 130Ba.


Content

Barium-130 is part of the isotope mixture that makes up the earth´s barium deposits - albeit only at 0.1 percent. It is considered a primordial radioisotope that is very weakly radioactive due to the presence of the daughter nuclide Xenon-130 in rocks. The nuclide 130Ba is also referred to as quasi-stable due to its very long half-life - i.e. radioactive decay events (double electron capture, 2EE) occur very rarely.

See also: list of Barium isotopes.

 

General data

Name of the isotope:Barium-130; Ba-130Symbol:130Ba or 13056BaMass number A:130 (= number of nucleons)Atomic number Z:56 (= number of protons)Neutrons N:74Isotopic mass:129.90632(2) u (atomic weight of Barium-130)Nuclide mass:129.8756016 u (calculated nuclear mass without electrons)Mass excess:-87.26236 MeVMass defect:1.173085576 u (per nucleus)Nuclear binding energy:1092.72217553 MeV (per nucleus)
8.4055552 MeV (average binding energy per nucleon)
Separation energy:SN = 10.267(11) MeV (first neutron)
SP = 7.047(5) MeV (first proton)
Half-life:1.6 × 1021 aDecay constant λ:1.373722056855 × 10-29 s-1Specific activity α:6.412982735493 × 10-8 Bq g-1
1.733238577160 × 10-18 Ci g-1
Spin and parity:
(nuclear angular momentum)
0+Charge radius:4.8283(47) femtometer fmYear of discovery:1936

 

Radioactive Decay

Half-life T½ = 1.6 × 1021 a respectively 5.045760 × 1028 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
2 EE130Xe

 

Parent Nuclides

Direct parent isotopes are: 130La, 130Cs.

 

Occurrence

Comparison of the natural Barium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

 

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+

 

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear IsomerExcitation EnergyHalf-lifeSpin
130mBa2475.12(18) keV9.4(4) ms8-

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 74) and isobaric (same nucleon number A = 130) with Barium-130. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 74Isobar A = 130
41115Nb
42116Mo
43117Tc
44118Ru
45119Rh
46120Pd
47121Ag130Ag
48122Cd130Cd
49123In130In
50124Sn130Sn
51125Sb130Sb
52126Te130Te
53127I130I
54128Xe130Xe
55129Cs130Cs
56130Ba130Ba
57131La130La
58132Ce130Ce
59133Pr130Pr
60134Nd130Nd
61135Pm130Pm
62136Sm130Sm
63137Eu130Eu
64138Gd
65139Tb
66140Dy
67141Ho

 

External data and identifiers

Adopted Levels, Gammas:NuDat 130Ba

 

Literature and References

[1] - A. P. Meshik, C. M. Hohenberg, O. V. Pravdivtseva, Ya. S. Kapusta:
Weak decay of 130Ba and 132Ba: Geochemical measurements.
In: Physical Review C, (2001), DOI 10.1103/PhysRevC.64.035205.

[2] - Magali Pujol, Bernard Marty, Pete Burnard, Pascal Philippot:
Xenon in Archean barite: Weak decay of 130Ba, mass-dependent isotopic fractionation and implication for barite formation.
In: Geochimica et Cosmochimica Acta, (2009), DOI 10.1016/j.gca.2009.08.002.

 


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Last update: 2023-05-05


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