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Gold-199

Properties and data of the isotope 199Au.


Contents

See also: list of Gold isotopes.

 

General data

Name of the isotope:Gold-199; Au-199Symbol:199Au or 19979AuMass number A:199 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:120Isotopic mass:198.9687666(6) u (atomic weight of Gold-199)Nuclide mass:198.9254335 u (calculated nuclear mass without electrons)Mass excess:-29.09372 MeVMass defect:1.689200848 u (per nucleus)Nuclear binding energy:1573.48045471 MeV (per nucleus)
7.90693696 MeV (average binding energy per nucleon)
Separation energy:SN = 7.58428(6) MeV (first neutron)
SP = 6.4787(21) MeV (first proton)
Half-life:3.139(7) dDecay constant λ:2.555758196821 × 10-9 s-1Specific activity α:7773300942018.5 Bq g-1
210.08921464915 Ci g-1
Spin and parity:
(nuclear angular momentum)
3/2+Magnetic dipole moment:μ(μN) = + 0.2715(7)Quadrupole moment Q:+ 0.510(16) barn (100 fm2)Nuclear g-factor:gl = 0.181Charge radius:5.4454(39) femtometer fmYear of discovery:1937

 

Radioactive Decay

Half-life T½ = 3.139(7) d respectively 2.7121 × 108 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
β-199Hg100 %0.4523(6) MeV

 

Parent Nuclides

Direct parent isotope is: 199Pt.

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
199mAu548.9405(21) keV0.44(3) ms(11/2)-

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 120) and isobaric (same nucleon number A = 199) with Gold-199. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 120Isobar A = 199
73193Ta
74194W
75195Re199Re
76196Os199Os
77197Ir199Ir
78198Pt199Pt
79199Au199Au
80200Hg199Hg
81201Tl199Tl
82202Pb199Pb
83203Bi199Bi
84204Po199Po
85205At199At
86206Rn199Rn
87207Fr199Fr
88208Ra
89209Ac
90210Th

 

External data and identifiers

Adopted Levels, Gammas:NuDat 199Au

 


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Last update: 2020-10-22


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