Gold-200

Properties and data of the isotope ²⁰⁰Au.

Content

General data

Name of the isotope:Gold-200; Au-200Symbol:²⁰⁰Au or 20079AuMass number A:200 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:121Isotopic mass:199.970757(29) u (atomic weight of Gold-200)Nuclide mass:199.9274239 u (calculated nuclear mass without electrons)Mass excess:-27.23968 MeVMass defect:1.695875364 u (per nucleus)Nuclear binding energy:1579.69772631 MeV (per nucleus)
7.89848863 MeV (average binding energy per nucleon)Separation energy:S_N = 6.218(27) MeV (first neutron)
S_P = 7.140(27) MeV (first proton)Half-life:48.4(3) minDecay constant λ:0.00023868704564736 s^-1Specific activity α:7.223150805681 × 10⁺¹⁷ Bq g^-1
19522029.204544 Ci g^-1Spin and parity:
(nuclear angular momentum)(1-)Year of discovery:1951

Radioactive Decay

Half-life T_½ = 48.4(3) min (minutes) respectively 2.904 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²⁰⁰Hg	100 %	2.263(27) MeV

Parent Nuclides

Direct parent isotope is: ²⁰⁰Pt.

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
^200mAu	962(88) keV	18.7(5) h	12-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 121) and isobaric (same nucleon number A = 200) with Gold-200. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 121	Isobar A = 200
73	¹⁹⁴Ta
74	¹⁹⁵W
75	¹⁹⁶Re
76	¹⁹⁷Os	²⁰⁰Os
77	¹⁹⁸Ir	²⁰⁰Ir
78	¹⁹⁹Pt	²⁰⁰Pt
79	²⁰⁰Au	²⁰⁰Au
80	²⁰¹Hg	²⁰⁰Hg
81	²⁰²Tl	²⁰⁰Tl
82	²⁰³Pb	²⁰⁰Pb
83	²⁰⁴Bi	²⁰⁰Bi
84	²⁰⁵Po	²⁰⁰Po
85	²⁰⁶At	²⁰⁰At
86	²⁰⁷Rn	²⁰⁰Rn
87	²⁰⁸Fr	²⁰⁰Fr
88	²⁰⁹Ra
89	²¹⁰Ac
90	²¹¹Th
91	²¹²Pa