Gold-194

Properties and data of the isotope ¹⁹⁴Au.

Contents

General data

Name of the isotope:Gold-194; Au-194Symbol:¹⁹⁴Au or 19479AuMass number A:194 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:115Isotopic mass:193.9654191(23) u (atomic weight of Gold-194)Nuclide mass:193.922086 u (calculated nuclear mass without electrons)Mass excess:-32.2119 MeVMass defect:1.649223768 u (per nucleus)Nuclear binding energy:1536.24204455 MeV (per nucleus)
7.91877343 MeV (average binding energy per nucleon)Separation energy:S_N = 6.878(9) MeV (first neutron)
S_P = 5.0213(25) MeV (first proton)Half-life:38.02(10) hDecay constant λ:5.064199986556 × 10^-6 s^-1Specific activity α:1.580172314089 × 10⁺¹⁶ Bq g^-1
427073.59840265 Ci g^-1Spin and parity:
(nuclear angular momentum)1-Magnetic dipole moment:μ(μ_N) = + 0.0763(13)Quadrupole moment Q:- 0.240(9) barn (100 fm²)Nuclear g-factor:g_l = 0.0763Charge radius:5.4252(40) femtometer fmYear of discovery:1948

Radioactive Decay

Half-life T_½ = 38.02(10) h (hours) respectively 1.36872 × 10⁵ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁹⁴Pt	100 %	2.5481(22) MeV

Parent Nuclides

Direct parent isotope is: ¹⁹⁴Hg.

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
^194m1Au	107.4(5) keV	600(8) ms	(5+)
^194m2Au	475.8(6) keV	420(10) ms	(11-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 115) and isobaric (same nucleon number A = 194) with Gold-194. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 115	Isobar A = 194
70	¹⁸⁵Yb
71	¹⁸⁶Lu
72	¹⁸⁷Hf
73	¹⁸⁸Ta	¹⁹⁴Ta
74	¹⁸⁹W	¹⁹⁴W
75	¹⁹⁰Re	¹⁹⁴Re
76	¹⁹¹Os	¹⁹⁴Os
77	¹⁹²Ir	¹⁹⁴Ir
78	¹⁹³Pt	¹⁹⁴Pt
79	¹⁹⁴Au	¹⁹⁴Au
80	¹⁹⁵Hg	¹⁹⁴Hg
81	¹⁹⁶Tl	¹⁹⁴Tl
82	¹⁹⁷Pb	¹⁹⁴Pb
83	¹⁹⁸Bi	¹⁹⁴Bi
84	¹⁹⁹Po	¹⁹⁴Po
85	²⁰⁰At	¹⁹⁴At
86	²⁰¹Rn	¹⁹⁴Rn
87	²⁰²Fr
88	²⁰³Ra
89	²⁰⁴Ac