Gold-194m2

Properties and data of the isotope ^194m2Au.

Contents

General data

Name of the isotope:Gold-194m2; Au-194m2Symbol:^194m2Au or 194m279AuMass 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-194m2)
Excitation energy: 475.8(6) keVNuclide 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)Half-life:420(10) msDecay constant λ:1.6503504299046 s^-1Specific activity α:5.149555832716 × 10⁺²¹ Bq g^-1
139177184668.01 Ci g^-1Spin and parity:
(nuclear angular momentum)(11-)

Radioactive Decay

Half-life T_½ = 420(10) ms respectively 4.20 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁹⁴Au	100 %

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
¹⁹⁴Au		38.02(10) h	1-
^194m1Au	107.4(5) keV	600(8) ms	(5+)

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-194m2. 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