Iridium-186
Properties and data of the isotope 186Ir.
See also: list of Iridium isotopes.
General data
Name of the isotope:Iridium-186; Ir-186Symbol:186Ir or 18677IrMass number A:186 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:109Isotopic mass:185.957947(18) u (atomic weight of Iridium-186)Nuclide mass:185.9157108 u (calculated nuclear mass without electrons)Mass excess:-39.17212 MeVMass defect:1.589056308 u (per nucleus)Nuclear binding energy:1480.19641656 MeV (per nucleus)
7.95804525 MeV (average binding energy per nucleon)Separation energy:SN = 6.91(3) MeV (first neutron)
SP = 3.655(17) MeV (first proton)Half-life:16.64(3) hDecay constant λ:1.157096655582 × 10-5 s-1Specific activity α:3.766594080258 × 10+16 Bq g-1
1017998.4000698 Ci g-1Spin and parity:
(nuclear angular momentum)5+Magnetic dipole moment:μ(μN) = + 3.88(5)Quadrupole moment Q:- 2.55(3) barn (100 fm2)Nuclear g-factor:gl = 0.776Charge radius:5.3900(1061) femtometer fmYear of discovery:1958
Radioactive Decay
Half-life T½ = 16.64(3) h (hours) respectively 5.9904 × 104 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EC/β+ | 186Os | 100 % | 3.828(17) MeV | |
Parent Nuclides
Direct parent isotope is: 186Pt.
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 |
---|
186mIr | +x keV | 1.90(5) h | 2- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 109) and isobaric (same nucleon number A = 186) with Iridium-186. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 109 | Isobar A = 186 |
68 | 177Er | |
69 | 178Tm | |
70 | 179Yb | |
71 | 180Lu | 186Lu |
72 | 181Hf | 186Hf |
73 | 182Ta | 186Ta |
74 | 183W | 186W |
75 | 184Re | 186Re |
76 | 185Os | 186Os |
77 | 186Ir | 186Ir |
78 | 187Pt | 186Pt |
79 | 188Au | 186Au |
80 | 189Hg | 186Hg |
81 | 190Tl | 186Tl |
82 | 191Pb | 186Pb |
83 | 192Bi | 186Bi |
84 | 193Po | 186Po |
85 | 194At | |
86 | 195Rn | |
External data and identifiers
Last update: 2020-10-21
Perma link: https://www.chemlin.org/isotope/iridium-186
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