Gold-197

Properties and data of the isotope ¹⁹⁷Au.

Content

General data

Name of the isotope:Gold-197; Au-197Symbol:¹⁹⁷Au or 19779AuMass number A:197 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:118Isotopic mass:196.966569(5) u (atomic weight of Gold-197)Nuclide mass:196.9232359 u (calculated nuclear mass without electrons)Mass excess:-31.14078 MeVMass defect:1.674068616 u (per nucleus)Nuclear binding energy:1559.38487139 MeV (per nucleus)
7.91565925 MeV (average binding energy per nucleon)Separation energy:S_N = 8.0724(29) MeV (first neutron)
S_P = 5.7842(5) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μ_N) = +0.145746Charge radius:5.4371(38) femtometer fmYear of discovery:1935

Parent Nuclides

Direct parent isotopes are: ¹⁹⁷Hg, ¹⁹⁷Pt.

Occurrence

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

	Atomic Mass m_a	Quantity	Half-life	Spin
Gold Isotopic mixture	196.966569 u	100 %
Isotope ¹⁹⁷Au	196.966569(5) u	100 %	stable	3/2+

NMR data

Nuclear magnetic properties of the NMR active Nuclide ¹⁹⁷Au

Isotope:¹⁹⁷Au-NMRQuantity:100 %Spin:3/2+Nuclearmagnetic moment
μ/μ_N:+0.145746Gyromagnetic ratio γ:0.4692 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = 0.097164Quadrupole moment Q:+ 0.547(16) barn (100 fm²)Resonance frequency:v₀ = 0.7406 at 1 TRelative Sensitivity:0.00003 (H₀ = const.)
0.0870 (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 Isomer	Excitation Energy	Half-life	Spin
^197mAu	409.15(8) keV	7.73(6) s	11/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 118) and isobaric (same nucleon number A = 197) with Gold-197. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 118	Isobar A = 197
72	¹⁹⁰Hf
73	¹⁹¹Ta
74	¹⁹²W	¹⁹⁷W
75	¹⁹³Re	¹⁹⁷Re
76	¹⁹⁴Os	¹⁹⁷Os
77	¹⁹⁵Ir	¹⁹⁷Ir
78	¹⁹⁶Pt	¹⁹⁷Pt
79	¹⁹⁷Au	¹⁹⁷Au
80	¹⁹⁸Hg	¹⁹⁷Hg
81	¹⁹⁹Tl	¹⁹⁷Tl
82	²⁰⁰Pb	¹⁹⁷Pb
83	²⁰¹Bi	¹⁹⁷Bi
84	²⁰²Po	¹⁹⁷Po
85	²⁰³At	¹⁹⁷At
86	²⁰⁴Rn	¹⁹⁷Rn
87	²⁰⁵Fr
88	²⁰⁶Ra
89	²⁰⁷Ac
90	²⁰⁸Th