Gold-186
Properties and data of the isotope 186Au.
See also: List of individual Gold isotopes (and general data sources).
General data
Name of the isotope:Gold-186; Au-186Symbol:186Au or 18679AuMass number A:186 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:107Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3544303797468 (= neutron-proton ratio)Neutron excess (N-Z):28Isotopic mass:185.965953(23) u (atomic weight of Gold-186)Nuclide mass:185.9226199 u (calculated nuclear mass without electrons)Mass excess:-31.71458 MeVMass defect:1.57937054 u (per nucleus)Nuclear binding energy:1471.17418179 MeV (per nucleus)
7.90953861 MeV (average binding energy per nucleon)Separation energy:SN = 7.928(21) MeV (first neutron)
SP = 2.32(3) MeV (first proton)Half-life:10.7(5) minDecay constant λ:0.010796685055451 s-1Specific activity α:3.514549093205 × 10+19 Bq g-1
949878133.29876 Ci g-1Spin and parity:
(nuclear angular momentum)3-Magnetic dipole moment:μ(μN) = - 1.272(22)Quadrupole moment Q:+ 3.10(6) barn (100 fm2)Nuclear g-factor:gl = -0.424Charge radius:5.4354(39) femtometer fmYear of discovery:1960
Radioactive Decay
Half-life T½ = 10.7(5) min (minutes) respectively 6.42 × 101 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 182Ir | trace | 4.912(14) MeV | |
| EC/β+ | 186Pt | 100 % | 6.15(3) MeV | |
Parent Nuclides
Direct parent isotope is: 186Hg.
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
| Nuclear Isomer | Excitation Energy | Half-life | Spin |
|---|
| 186mAu | 227.77(7) keV | 110(10) ns | 2+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 107) and isobaric (same nucleon number A = 186) with Gold-186. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 107 | Isobar A = 186 |
|---|
| 65 | 172Tb | |
| 66 | 173Dy | |
| 67 | 174Ho | |
| 68 | 175Er | |
| 69 | 176Tm | |
| 70 | 177Yb | |
| 71 | 178Lu | 186Lu |
| 72 | 179Hf | 186Hf |
| 73 | 180Ta | 186Ta |
| 74 | 181W | 186W |
| 75 | 182Re | 186Re |
| 76 | 183Os | 186Os |
| 77 | 184Ir | 186Ir |
| 78 | 185Pt | 186Pt |
| 79 | 186Au | 186Au |
| 80 | 187Hg | 186Hg |
| 81 | 188Tl | 186Tl |
| 82 | 189Pb | 186Pb |
| 83 | 190Bi | 186Bi |
| 84 | 191Po | 186Po |
| 85 | 192At | |
| 86 | 193Rn | |
External data and identifiers
Last update: 2020-10-22
Perma link: https://www.chemlin.org/isotope/gold-186
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