Gold-179m

Properties and data of the isotope ¹⁷⁹Au.

Content

General data

Name of the isotope:Gold-179m; Au-179mSymbol:¹⁷⁹Au or 17979AuMass number A:179 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:100Isotopic mass:178.973174(13) u (atomic weight of Gold-179m)
Excitation energy: +x keVNuclide 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)Half-life:100 μsDecay constant λ:6931.4718055995 s^-1Specific activity α:2.345073010112 × 10⁺²⁵ Bq g^-1
6.338035162465 × 10⁺¹⁴ Ci g^-1Spin and parity:
(nuclear angular momentum)

Radioactive Decay

Half-life T_½ = 100 μs respectively 1.0 × 10^-4 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁷⁹Au	?

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
¹⁷⁹Au		7.1(3) s	(1/2+,3/2+)

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-179m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 100	Isobar A = 179
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