Gold-179

Properties and data of the isotope ¹⁷⁹Au.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Gold isotopes (and general data sources).

General data

Name of the isotope:Gold-179; Au-179Symbol:¹⁷⁹Au or 17979AuMass number A:179 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:100Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.2658227848101 (= neutron-proton ratio)Neutron excess (N-Z):21Isotopic mass:178.973174(13) u (atomic weight of Gold-179)Nuclide mass:178.9298409 u (calculated nuclear mass without electrons)Mass excess:-24.98826 MeVMass defect:1.511495128 u (per nucleus)Nuclear binding energy:1407.94864276 MeV (per nucleus)
7.86563488 MeV (average binding energy per nucleon)Separation energy:S_N = 10.756(15) MeV (first neutron)
S_P = 0.280(15) MeV (first proton)Half-life:7.1(3) sDecay constant λ:0.097626363459147 s^-1Specific activity α:3.302919732552 × 10⁺²⁰ Bq g^-1
8926810087.98 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2+.3/2+)Year of discovery:1968

Radioactive Decay

Half-life T_½ = 7.1(3) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁷⁵Ir	22.0(9) %	5.981(5) MeV
EC/β⁺	¹⁷⁹Pt	78.0(9) %	7.280(14) MeV

Parent Nuclides

Direct parent isotope is: ¹⁸³Tl.

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
^179mAu	+x keV	100 μs

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 100) and isobaric (same nucleon number A = 179) with Gold-179. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 100	Isobar A = 179
58	¹⁵⁸Ce
59	¹⁵⁹Pr
60	¹⁶⁰Nd
61	¹⁶¹Pm
62	¹⁶²Sm
63	¹⁶³Eu
64	¹⁶⁴Gd
65	¹⁶⁵Tb
66	¹⁶⁶Dy
67	¹⁶⁷Ho
68	¹⁶⁸Er
69	¹⁶⁹Tm	¹⁷⁹Tm
70	¹⁷⁰Yb	¹⁷⁹Yb
71	¹⁷¹Lu	¹⁷⁹Lu
72	¹⁷²Hf	¹⁷⁹Hf
73	¹⁷³Ta	¹⁷⁹Ta
74	¹⁷⁴W	¹⁷⁹W
75	¹⁷⁵Re	¹⁷⁹Re
76	¹⁷⁶Os	¹⁷⁹Os
77	¹⁷⁷Ir	¹⁷⁹Ir
78	¹⁷⁸Pt	¹⁷⁹Pt
79	¹⁷⁹Au	¹⁷⁹Au
80	¹⁸⁰Hg	¹⁷⁹Hg
81	¹⁸¹Tl	¹⁷⁹Tl
82	¹⁸²Pb	¹⁷⁹Pb