Gold-188

Properties and data of the isotope ¹⁸⁸Au.

Content

General data

Name of the isotope:Gold-188; Au-188Symbol:¹⁸⁸Au or 18879AuMass number A:188 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:109Isotopic mass:187.9652480(29) u (atomic weight of Gold-188)Nuclide mass:187.9219149 u (calculated nuclear mass without electrons)Mass excess:-32.37128 MeVMass defect:1.597405372 u (per nucleus)Nuclear binding energy:1487.97351959 MeV (per nucleus)
7.91475276 MeV (average binding energy per nucleon)Separation energy:S_N = 7.415(22) MeV (first neutron)
S_P = 2.975(24) MeV (first proton)Half-life:8.84(6) minDecay constant λ:0.0013068385757163 s^-1Specific activity α:4.208537959445 × 10⁺¹⁸ Bq g^-1
113744269.1742 Ci g^-1Spin and parity:
(nuclear angular momentum)1-Magnetic dipole moment:μ(μ_N) = - 0.067(28)Nuclear g-factor:g_l = -0.067Charge radius:5.4049(55) femtometer fmYear of discovery:1955

Radioactive Decay

Half-life T_½ = 8.84(6) min (minutes) respectively 5.304 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁸⁸Pt	100 %	5.45(6) MeV

Parent Nuclides

Direct parent isotope is: ¹⁸⁸Hg.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 109) and isobaric (same nucleon number A = 188) with Gold-188. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 109	Isobar A = 188
68	¹⁷⁷Er
69	¹⁷⁸Tm
70	¹⁷⁹Yb
71	¹⁸⁰Lu	¹⁸⁸Lu
72	¹⁸¹Hf	¹⁸⁸Hf
73	¹⁸²Ta	¹⁸⁸Ta
74	¹⁸³W	¹⁸⁸W
75	¹⁸⁴Re	¹⁸⁸Re
76	¹⁸⁵Os	¹⁸⁸Os
77	¹⁸⁶Ir	¹⁸⁸Ir
78	¹⁸⁷Pt	¹⁸⁸Pt
79	¹⁸⁸Au	¹⁸⁸Au
80	¹⁸⁹Hg	¹⁸⁸Hg
81	¹⁹⁰Tl	¹⁸⁸Tl
82	¹⁹¹Pb	¹⁸⁸Pb
83	¹⁹²Bi	¹⁸⁸Bi
84	¹⁹³Po	¹⁸⁸Po
85	¹⁹⁴At
86	¹⁹⁵Rn