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Lead-207

Properties and data of the isotope 207Pb.


Content

See also: list of Lead isotopes.

 

General data

Name of the isotope:Lead-207; Pb-207Other names:Actinium DSymbol:207Pb or 20782PbMass number A:207 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:125Isotopic mass:206.975897(8) u (atomic weight of Lead-207)Nuclide mass:206.9309186 u (calculated nuclear mass without electrons)Mass excess:-22.4518 MeVMass defect:1.748870124 u (per nucleus)Nuclear binding energy:1629.06202729 MeV (per nucleus)
7.86986487 MeV (average binding energy per nucleon)
Separation energy:SN = 6.73778(10) MeV (first neutron)
SP = 7.4876(6) MeV (first proton)
Half-life:stableSpin and parity:
(nuclear angular momentum)
1/2-Magnetic dipole moment:μ(μN) = + 0.59258Charge radius:5.4943(14) femtometer fmYear of discovery:1927

 

Parent Nuclides

Direct parent isotopes are: 207Bi, 211Po, 207Tl, 221Ra.

 

Occurrence

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

 

Atomic Mass maQuantityHalf-lifeSpin
Lead
Isotopic mixture
207.2 u100 %
Isotope 204Pb203.973044(8) u1.4(6) %1.4 × 1017 a0+
Isotope 206Pb205.974466(8) u24.1(30) %stable0+
Isotope 207Pb206.975897(8) u22.1(50) %stable1/2-
Isotope 208Pb207.976653(8) u52.4(70) %stable0+

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 207Pb

Isotope:207Pb-NMRQuantity:22.1(50) %Spin:1/2-Nuclearmagnetic moment
μ/μN:
+ 0.59258Gyromagnetic ratio γ:5.6264 · 107 rad T-1 s-1Nuclear g-factor:gl = 1.18516Resonance frequency:v0 = 9.0340 at 1 TRelative Sensitivity:0.00955 (H0 = const.)
0.2122 (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
207mPb1633.356(4) keV806(5) ms13/2+

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 125) and isobaric (same nucleon number A = 207) with Lead-207. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 125Isobar A = 207
76201Os
77202Ir
78203Pt207Pt
79204Au207Au
80205Hg207Hg
81206Tl207Tl
82207Pb207Pb
83208Bi207Bi
84209Po207Po
85210At207At
86211Rn207Rn
87212Fr207Fr
88213Ra207Ra
89214Ac207Ac
90215Th207Th
91216Pa
92217U

 

External data and identifiers

Adopted Levels, Gammas:NuDat 207Pb

 


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Last update: 2023-05-04


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