Gold-184
Properties and data of the isotope 184Au.
See also: List of individual Gold isotopes (and general data sources).
General data
Name of the isotope:Gold-184; Au-184Symbol:184Au or 18479AuMass number A:184 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:105Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3291139240506 (= neutron-proton ratio)Neutron excess (N-Z):26Isotopic mass:183.967452(24) u (atomic weight of Gold-184)Nuclide mass:183.9241189 u (calculated nuclear mass without electrons)Mass excess:-30.31827 MeVMass defect:1.560541708 u (per nucleus)Nuclear binding energy:1453.63523775 MeV (per nucleus)
7.90019151 MeV (average binding energy per nucleon)Separation energy:SN = 8.199(24) MeV (first neutron)
SP = 1.835(27) MeV (first proton)Half-life:20.6(9) sDecay constant λ:0.033647921386405 s-1Specific activity α:1.107281542256 × 10+20 Bq g-1
2992652816.9105 Ci g-1Spin and parity:
(nuclear angular momentum)5+Magnetic dipole moment:μ(μN) = + 2.07(2)Quadrupole moment Q:+ 4.65(26) barn (100 fm2)Nuclear g-factor:gl = 0.414Charge radius:5.4306(41) femtometer fmYear of discovery:1969
Radioactive Decay
Half-life T½ = 20.6(9) s respectively 2.06 × 101 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 180Ir | ≤ 0.016 % | 5.234(5) MeV | |
| EC/β+ | 184Pt | %ge; 99.984 % | 7.016(27) MeV | |
Parent Nuclides
Direct parent isotope is: 184Hg.
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 |
|---|
| 184mAu | 66.46(4) keV | 47.6(14) s | 2+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 105) and isobaric (same nucleon number A = 184) with Gold-184. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 105 | Isobar A = 184 |
|---|
| 63 | 168Eu | |
| 64 | 169Gd | |
| 65 | 170Tb | |
| 66 | 171Dy | |
| 67 | 172Ho | |
| 68 | 173Er | |
| 69 | 174Tm | |
| 70 | 175Yb | 184Yb |
| 71 | 176Lu | 184Lu |
| 72 | 177Hf | 184Hf |
| 73 | 178Ta | 184Ta |
| 74 | 179W | 184W |
| 75 | 180Re | 184Re |
| 76 | 181Os | 184Os |
| 77 | 182Ir | 184Ir |
| 78 | 183Pt | 184Pt |
| 79 | 184Au | 184Au |
| 80 | 185Hg | 184Hg |
| 81 | 186Tl | 184Tl |
| 82 | 187Pb | 184Pb |
| 83 | 188Bi | 184Bi |
| 84 | 189Po | |
| 85 | 190At | |
External data and identifiers
Last update: 2020-10-22
Perma link: https://www.chemlin.org/isotope/gold-184
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