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Barium-137

Properties and data of the isotope 137Ba.

Content
General Data
Parent Nuclides
NMR Data
Isotones und Isobares

See also: list of Barium isotopes.

 

General data

Name of the isotope:Barium-137; Ba-137Symbol:137Ba or 13756BaMass number A:137 (= number of nucleons)Atomic number Z:56 (= number of protons)Neutrons N:81Isotopic mass:136.905827(2) u (atomic weight of Barium-137)Nuclide mass:136.8751086 u (calculated nuclear mass without electrons)Mass excess:-87.72158 MeVMass defect:1.234232988 u (per nucleus)Nuclear binding energy:1149.68062292 MeV (per nucleus)
8.39182936 MeV (average binding energy per nucleon)Separation energy:SN = 6.90563(7) MeV (first neutron)
SP = 8.6715(19) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μN) = +0.9375(2)Charge radius:4.8314(47) femtometer fmYear of discovery:1932

 

Parent Nuclides

Direct parent isotopes are: 137La, 137Cs.

 

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+

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 137Ba

Isotope:137Ba-NMRQuantity:11.23(23) %Spin:3/2+Nuclearmagnetic moment
μ/μN:+0.9375(2)Gyromagnetic ratio γ:3.5575 · 107 rad T-1 s-1Nuclear g-factor:gl = 0.625Quadrupole moment Q:+ 0.245(4) barn (100 fm2)Resonance frequency:v0 = 4.7634 at 1 TRelative Sensitivity:0.00700 (H0 = const.)
0.5594 (v0 = const.)
[related to 1H = 1.000]

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
137mBa661.659(3) keV2.552(1) min11/2-
137m2Ba2349.1(5) keV0.59(10) μs(17/2-)

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 81) and isobaric (same nucleon number A = 137) with Barium-137. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 81Isobar A = 137
45126Rh
46127Pd
47128Ag
48129Cd
49130In137In
50131Sn137Sn
51132Sb137Sb
52133Te137Te
53134I137I
54135Xe137Xe
55136Cs137Cs
56137Ba137Ba
57138La137La
58139Ce137Ce
59140Pr137Pr
60141Nd137Nd
61142Pm137Pm
62143Sm137Sm
63144Eu137Eu
64145Gd137Gd
65146Tb137Tb
66147Dy
67148Ho
68149Er
69150Tm
70151Yb
71152Lu
72153Hf

 

External data and identifiers

Adopted Levels, Gammas:NuDat 137Ba

 

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Last update: 2020-10-19

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